'n Ontleding van landboutourisme in die Tuinroete-gebied van Suid-Afrika
- Authors: De Jager, Jacobus Lodevicus
- Date: 2003
- Subjects: Tourism -- South Africa -- Garden Route , Farms -- Recreational use -- South Africa -- Garden Route
- Language: Afrikaans
- Type: Thesis , Masters , MTech (Agricultural Management)
- Identifier: vital:10954 , http://hdl.handle.net/10948/137 , Tourism -- South Africa -- Garden Route , Farms -- Recreational use -- South Africa -- Garden Route
- Description: The aim of this study was to create a profile of the agricultural tourism industry in the Garden Route area of South Africa, and to determine what general influence agricultural tourism has on the macro environment (rural area) with regard to socio- economic development, as ell as on the micro environment (farm) with regard to the generating of additional income. This study only includes agricultural operations (farms) in the Garden Route area that practice tourism activities. Out of 54 potential agricultural units that were identified, 46 were willing to participate in the study. Information from only 40 of the abovementioned units was finally included in this study. Six agricultural units could not supply sufficient information during the surveys. Data were gathered by means of a scientifically compiled questionnaire. All the individuals involved in this study completed this questionnaire by means of a personal interview. The aspects investigated in order to compile a profile were the characteristics of the suppliers, activities and the extent of the agricultural tourism industry. In order to determine the contribution of agricultural tourism on micro- and macro levels, aspects such as the contribution to farming turnover were investigated as well as the socioeconomic contribution in view of the infrastructure development, job creation, education and housing. The results of this study indicate that 78% of respondents are aged 40 years and older, are mainly male, and, in most of the cases, married (95%). Agricultural tourism enterprises in the Garden Route area are, in most cases (60%), managed by the farmers’ wives. The business type whereby respondents’ agricultural tourism enterprises are conducted, is as follows: in 72.5% of the cases a sole ownership, 17.5% a private company, 5% a partnership, 2.5% a closed corporation and the other remaining 2.5% is managed as a trust. The majority (65%) of persons involved in the management of the agricultural tourism enterprise has received some form of tertiary education. A degree of statistical significance (p = 0.0728) exists between the education level of the type of person/persons that manages the tourist branches and the type of activity category that is offered. In 65% of the cases the farms that offered agricultural tourism, were smaller than 500 hectare. A negative correlation (r² = -0.31700; p<0.0001) was found between farm size and the total farming turnover per year. This trend is even more distinctive (r² = -0.47156; p<0.0001) for farms smaller than 1 000 ha. A statistically meaningful (p = 0.0115) relationship exists between farm size and the number of activities that were offered. This occured in cases where farms were smaller than 1 000 ha. In 25% of the cases only one agricultural tourism activity was offered, 12.5% of these farms were 100 ha or smaller. The maximum number of activities that were offered was 11 and it was found in 3.13% of the cases. A highly statistically meaningful (p = <0.0001) connection exists between the percentage tourism turnover per year and the different types of activity categories that were offered. In 35.75% of the cases these activity categories earned between 1 and 10% of the yearly tourism turnover. A highly statistically meaningful (p = 0.0036) connection also exists between the degree of popularity and the type of activity category that was offered. In 53.07% of the cases the most popular activities were those that are nature-based, followed by accommodation-based activities (23.46%). In 82.5% of the cases additional income was the main reason for offering agricultural tourism. Other distinctive reasons were the love for people (50%) and the desire to share the farm life and beauty with others (25%). The tourism activities that were offered on the farms were respectively, guest houses (62.5%) followed by hiking trails (57.5%) and swimming opportunities (32.5%). Wildlife viewing was the activity that has been offered for the longest period of time, some 11,5 years. The general location of the agricultural tourism operations were 21.9 km from towns and 9.65 km from main routes. Word-of-mouth was the most successful marketing method, followed by the use of own brochures (90%) and local tourism bureau brochures (87.5%). A degree of statistical significance (p = 0.0902) exists between the number of marketing methods and the average percentage of the tourism branch as a total part of the total farming turnover per year. A positive correlation (r² = 0.29118; p<0.0001) exists between the number of marketing methods and the total farming turnover per year. Visitors to the agriculture tourism operations were in 55% of the cases mainly domestic tourists, followed by 25% that includes both domestic and foreign tourists, and a further 20% that mainly includes foreign tourists. The majority (67.5%) of operations indicated that agricultural tourism formed less than 30% (between 2% and 30%) of their annual agricultural turnover, 5% between 30% - 50%, 25% between 80% - 100% of their turnover, while 2.5% generated no income from agricultural tourism. A highly statistically meaningful (p = 0.0010) relationship exists between the percentages that the tourism branch contributes as a total of the farming turnover per year and the number of years that the respondents hade been involved in the offering of agricultural tourism. A positive correlation (r² = 0.30005; p<0.0001) exists between the number of years involved with the offering of agricultural tourism and the average percentage of the total farming turnover per year. New infrastructure was created by 40% of the providers, a further 12.5% partially created new infrastructure, while 47.5% made use of infrastructure that was already in place. Thus far job opportunities have been created for 58 people of whom 13.79% are male and 86.21% are female. A statistically meaningful (p = 0.0406) relationship exists between the number of workers that had to be appointed additionally and the number of activities that were offered. In 17.5% of the cases it was only needed to appoint one worker, followed by 2.5% that appointed three workers each, 5% that had to appoint four workers each and a further 2.5% that had to appoint seven workers each. There are 27.5% of agricultural tourism providers that had to appoint additional workers, 20% provided education to those workers and 36.36% of the above-mentioned provided housing to those workers and their dependants. A statistically meaningful (p = 0.0209) relationship exists between education provided to workers that had to be appointed additionally and the type of activity combination that was presented. A degree of statistical significance (p = 0.0691) exists between housing provided to additional workers and the number of activities that were presented. A statistically meaningful (p = 0.0455) relationship further exists between housing provided to workers that had to be appointed additionally and the type of activity combination that was presented. From the results of this study it appeared that the development of agricultural tourism in the Garden Route area has a positive impact on the micro- and macro environments of the rural areas. This impact can make a direct or indirect contribution to the socio-economic development of this region and it can induce the generation of additional income, infrastructure development, job creation, education and housing. This study suggests that there is significant potential for the further development and exploitation of agricultural tourism.
- Full Text:
- Date Issued: 2003
- Authors: De Jager, Jacobus Lodevicus
- Date: 2003
- Subjects: Tourism -- South Africa -- Garden Route , Farms -- Recreational use -- South Africa -- Garden Route
- Language: Afrikaans
- Type: Thesis , Masters , MTech (Agricultural Management)
- Identifier: vital:10954 , http://hdl.handle.net/10948/137 , Tourism -- South Africa -- Garden Route , Farms -- Recreational use -- South Africa -- Garden Route
- Description: The aim of this study was to create a profile of the agricultural tourism industry in the Garden Route area of South Africa, and to determine what general influence agricultural tourism has on the macro environment (rural area) with regard to socio- economic development, as ell as on the micro environment (farm) with regard to the generating of additional income. This study only includes agricultural operations (farms) in the Garden Route area that practice tourism activities. Out of 54 potential agricultural units that were identified, 46 were willing to participate in the study. Information from only 40 of the abovementioned units was finally included in this study. Six agricultural units could not supply sufficient information during the surveys. Data were gathered by means of a scientifically compiled questionnaire. All the individuals involved in this study completed this questionnaire by means of a personal interview. The aspects investigated in order to compile a profile were the characteristics of the suppliers, activities and the extent of the agricultural tourism industry. In order to determine the contribution of agricultural tourism on micro- and macro levels, aspects such as the contribution to farming turnover were investigated as well as the socioeconomic contribution in view of the infrastructure development, job creation, education and housing. The results of this study indicate that 78% of respondents are aged 40 years and older, are mainly male, and, in most of the cases, married (95%). Agricultural tourism enterprises in the Garden Route area are, in most cases (60%), managed by the farmers’ wives. The business type whereby respondents’ agricultural tourism enterprises are conducted, is as follows: in 72.5% of the cases a sole ownership, 17.5% a private company, 5% a partnership, 2.5% a closed corporation and the other remaining 2.5% is managed as a trust. The majority (65%) of persons involved in the management of the agricultural tourism enterprise has received some form of tertiary education. A degree of statistical significance (p = 0.0728) exists between the education level of the type of person/persons that manages the tourist branches and the type of activity category that is offered. In 65% of the cases the farms that offered agricultural tourism, were smaller than 500 hectare. A negative correlation (r² = -0.31700; p<0.0001) was found between farm size and the total farming turnover per year. This trend is even more distinctive (r² = -0.47156; p<0.0001) for farms smaller than 1 000 ha. A statistically meaningful (p = 0.0115) relationship exists between farm size and the number of activities that were offered. This occured in cases where farms were smaller than 1 000 ha. In 25% of the cases only one agricultural tourism activity was offered, 12.5% of these farms were 100 ha or smaller. The maximum number of activities that were offered was 11 and it was found in 3.13% of the cases. A highly statistically meaningful (p = <0.0001) connection exists between the percentage tourism turnover per year and the different types of activity categories that were offered. In 35.75% of the cases these activity categories earned between 1 and 10% of the yearly tourism turnover. A highly statistically meaningful (p = 0.0036) connection also exists between the degree of popularity and the type of activity category that was offered. In 53.07% of the cases the most popular activities were those that are nature-based, followed by accommodation-based activities (23.46%). In 82.5% of the cases additional income was the main reason for offering agricultural tourism. Other distinctive reasons were the love for people (50%) and the desire to share the farm life and beauty with others (25%). The tourism activities that were offered on the farms were respectively, guest houses (62.5%) followed by hiking trails (57.5%) and swimming opportunities (32.5%). Wildlife viewing was the activity that has been offered for the longest period of time, some 11,5 years. The general location of the agricultural tourism operations were 21.9 km from towns and 9.65 km from main routes. Word-of-mouth was the most successful marketing method, followed by the use of own brochures (90%) and local tourism bureau brochures (87.5%). A degree of statistical significance (p = 0.0902) exists between the number of marketing methods and the average percentage of the tourism branch as a total part of the total farming turnover per year. A positive correlation (r² = 0.29118; p<0.0001) exists between the number of marketing methods and the total farming turnover per year. Visitors to the agriculture tourism operations were in 55% of the cases mainly domestic tourists, followed by 25% that includes both domestic and foreign tourists, and a further 20% that mainly includes foreign tourists. The majority (67.5%) of operations indicated that agricultural tourism formed less than 30% (between 2% and 30%) of their annual agricultural turnover, 5% between 30% - 50%, 25% between 80% - 100% of their turnover, while 2.5% generated no income from agricultural tourism. A highly statistically meaningful (p = 0.0010) relationship exists between the percentages that the tourism branch contributes as a total of the farming turnover per year and the number of years that the respondents hade been involved in the offering of agricultural tourism. A positive correlation (r² = 0.30005; p<0.0001) exists between the number of years involved with the offering of agricultural tourism and the average percentage of the total farming turnover per year. New infrastructure was created by 40% of the providers, a further 12.5% partially created new infrastructure, while 47.5% made use of infrastructure that was already in place. Thus far job opportunities have been created for 58 people of whom 13.79% are male and 86.21% are female. A statistically meaningful (p = 0.0406) relationship exists between the number of workers that had to be appointed additionally and the number of activities that were offered. In 17.5% of the cases it was only needed to appoint one worker, followed by 2.5% that appointed three workers each, 5% that had to appoint four workers each and a further 2.5% that had to appoint seven workers each. There are 27.5% of agricultural tourism providers that had to appoint additional workers, 20% provided education to those workers and 36.36% of the above-mentioned provided housing to those workers and their dependants. A statistically meaningful (p = 0.0209) relationship exists between education provided to workers that had to be appointed additionally and the type of activity combination that was presented. A degree of statistical significance (p = 0.0691) exists between housing provided to additional workers and the number of activities that were presented. A statistically meaningful (p = 0.0455) relationship further exists between housing provided to workers that had to be appointed additionally and the type of activity combination that was presented. From the results of this study it appeared that the development of agricultural tourism in the Garden Route area has a positive impact on the micro- and macro environments of the rural areas. This impact can make a direct or indirect contribution to the socio-economic development of this region and it can induce the generation of additional income, infrastructure development, job creation, education and housing. This study suggests that there is significant potential for the further development and exploitation of agricultural tourism.
- Full Text:
- Date Issued: 2003
'n Kritiese evaluering na die effektiwiteit van bestuurstrategieë vir ekstensiewe wolskaapboerdery in die groter Burgersdorp omgewing
- Authors: Coetzee, Johanna Magdalena
- Date: 2002
- Subjects: Sheep ranches -- South Africa -- Burgersdorp -- Management , Sheep industry -- South Africa -- Burgersdorp
- Language: Afrikaans
- Type: Thesis , Masters , MTech
- Identifier: vital:10953 , http://hdl.handle.net/10948/109 , Sheep ranches -- South Africa -- Burgersdorp -- Management , Sheep industry -- South Africa -- Burgersdorp
- Description: The main objectives of this study can be divided into three categories. In the first place it refers to the determination of production- and reproduction norms for the different main production areas in the greater Burgersdorp area, to promote production. In the second place it refers to the determination of the different management styles of sheep farmers in the greater Burgersdorp area. In the third place it refers to the calculation of gross margins for sheep farming in the greater Burgersdorp area, to establish the sustainable economic position. The survey area (the greater Burgersdorp area) includes the magisterial districts of Burgersdorp, Molteno, Steynsburg and Venterstad. The four magisterial districts were divided into two main production areas namely Stormberg Highveld and Burgersdorp Lowveld. Stormberg Highveld includes Molteno and the high-lying area (highveld) of Burgersdorp. Burgersdorp Lowveld comprises Steynsburg, Venterstad and the low-lying area (lowveld) of Burgersdorp. The management strategies of sheep farmers in the survey area were determined by means of a questionnaire and statistically analysed. The economic analyses of the sheep industry (wool and meat) were performed with the Geyer computer model. In this study it showed that the Dorper farmers obtained the highest gross margin per sheep. The lowest gross margin per sheep resulted from the Vleismerino farmers. Although the composition of the gross production value and the directly allocatable variable costs compare favourably, each main production area has unique management strategies for the different sheep breeds. The different management strategies can serve as the norm for extensive sheep farming, applicable to the specific main production area.
- Full Text:
- Date Issued: 2002
- Authors: Coetzee, Johanna Magdalena
- Date: 2002
- Subjects: Sheep ranches -- South Africa -- Burgersdorp -- Management , Sheep industry -- South Africa -- Burgersdorp
- Language: Afrikaans
- Type: Thesis , Masters , MTech
- Identifier: vital:10953 , http://hdl.handle.net/10948/109 , Sheep ranches -- South Africa -- Burgersdorp -- Management , Sheep industry -- South Africa -- Burgersdorp
- Description: The main objectives of this study can be divided into three categories. In the first place it refers to the determination of production- and reproduction norms for the different main production areas in the greater Burgersdorp area, to promote production. In the second place it refers to the determination of the different management styles of sheep farmers in the greater Burgersdorp area. In the third place it refers to the calculation of gross margins for sheep farming in the greater Burgersdorp area, to establish the sustainable economic position. The survey area (the greater Burgersdorp area) includes the magisterial districts of Burgersdorp, Molteno, Steynsburg and Venterstad. The four magisterial districts were divided into two main production areas namely Stormberg Highveld and Burgersdorp Lowveld. Stormberg Highveld includes Molteno and the high-lying area (highveld) of Burgersdorp. Burgersdorp Lowveld comprises Steynsburg, Venterstad and the low-lying area (lowveld) of Burgersdorp. The management strategies of sheep farmers in the survey area were determined by means of a questionnaire and statistically analysed. The economic analyses of the sheep industry (wool and meat) were performed with the Geyer computer model. In this study it showed that the Dorper farmers obtained the highest gross margin per sheep. The lowest gross margin per sheep resulted from the Vleismerino farmers. Although the composition of the gross production value and the directly allocatable variable costs compare favourably, each main production area has unique management strategies for the different sheep breeds. The different management strategies can serve as the norm for extensive sheep farming, applicable to the specific main production area.
- Full Text:
- Date Issued: 2002
Effect of high energy diets on the productive and reproductive characteristics of young Bonsmara bulls
- Labuschagné, Hermanus Stefanus
- Authors: Labuschagné, Hermanus Stefanus
- Date: 2001
- Subjects: Bonsmara cattle
- Language: English
- Type: Thesis , Masters , MTech (Agricultural Management)
- Identifier: vital:10956 , http://hdl.handle.net/10948/58 , Bonsmara cattle
- Description: A study to evaluate the effect of feeding a high energy diet on the productive and reproductive characteristics of young bulls was carried out at two different locations in the Free State Province. Two trials were conducted with the aim of evaluating the effect of level of dietary energy and age of the bulls on their productive performance and reproductive characteristics. In the first trial, two levels of energy were fed to two groups of young (343 ± days) Bonsmara bulls. The high energy group HE (n=36) bulls were Phase-C performance tested in an official performance testing center and received a high energy diet for 112 days (28 days adaptation and 84 days testing). The medium energy group ME (n=18) bulls were phase-D performance tested and received a medium-energy diet for 140 days (28 days adaptation and 112 days testing). At the end of both performance testing periods, the productive performances and reproductive characteristics of the two groups were compared. The productive parameters compared included final live body weight (FLW), average daily gain (ADG), average daily gain per day of age (ADA) and body condition score (BCS). The reproductive parameters compared between groups included scrotal circumference (SC), semen volume (Vol) and concentration (SConO), mass movement (MV), linear motility (LM), percentage live sperm (LS), as well as percentage of total abnormalities: major (MD) and minor (MinD). The results of this trial indicated that in general, bulls from the HE group showed a significant (p<0.01) higher FLW, BCS, ADG and ADA, but a significant (p<0.01) lower volume and concentration of the ejaculate, lower mass movement and linear motility, lower percentage of live sperm and higher percentage of major defects and significantly (p<0.05) higher percentage of minor defects than the bulls from the ME group. In the second trial, 36 young Bonsmara bulls were divided into two groups according to their age at the arrival at an official Phase-C performance testing center. Older bulls (OB) (n=19) and younger bulls (YB) (n=17) all received a high energy diet for 112 days (28 days adaptation and 84 days testing). At the end of the Phase-C test the productive performances and reproductive characteristics of the two groups were compared. The animals from both groups that did not pass the Phase-C test, either due to poor performance or not meeting the breed standards, were slaughtered at an official abattoir and their scrotums and carcass characteristics were also compared. The productive parameters compared between the two groups included final live body weight (FLW), average daily gain (ADG), average daily gain per day of age (ADA), body condition score (BCS), feed conversion ratio (FCR), carcass weight both warm (CWW) and cold (CWC), as well as dressing percentage (CDP) and fat grade (CFG). The reproductive parameters compared between the two groups included scrotal circumference (SC), total scrotal weight (TSW), scrotal fat (SF), scrotal skin weight (SSW), paired testes weight (PTW), scrotal skin thickness (SST), total testes circumference (TTC), total testicle volume (TTV), weight of epididimis / spermatic cord (WESC), volume of epididymis / spermatic cord (VESC) and the percentage of bulls with depressed spermatogenesis (PBDS), semen concentration (SConO), mass movement (MV), linear motility (LM), percentage live sperm (LS), percentage of total abnormalities: major (MD) and minor(MinD) as well as the percentage of bulls with depressed spermatogenesis (PBDS). The results of this trial indicated that in general, the younger bulls showed a significant (p<0.05) higher ADG, but a significant (p<0.05) lower ADA than the older bulls. Regarding the reproductive organs compared, the younger bulls showed a significantly (p<0.01) higher total scrotal weight, scrotal fat and scrotal skin weight and thickness. No significant differences were observed on the testicular parameters measured between the two groups. In addition, both weight (WECS) and volume (VECS) of the epididymis / spermatic cord were significantly (P<0.05) higher in the older bulls. In general, the younger group showed poorer semen characteristics. A significantly (p<0.01) lower sperm concentration and linear movement and a significantly (p<0.05) higher percentage of major defects were recorded on the younger bulls, when compared to the older bulls. About half of the bulls in each group showed clear signs of depressed spermatogenesis in their seminiferous tubules, during the histological examination of testicular tissue. The results of this study indicates that high energy diets are beneficial for the productive performance of young bulls (growth rate, BCS and carcass characteristics), but have a detrimental effect on the reproductive characteristics of young bulls. The effect of high energy diets on both the productive and reproductive performances of young beef bulls are more pronounced at a younger age. High energy diets resulted in heavier scrotums in the younger bulls when compared to the older bulls, as a direct result of a higher fat deposition in this region without any relevant effect on testicular size. No intra-testicular fat deposition was observed. The scrotal fat observed in high energy fed young bulls accumulated mainly in the neck of the scrotum, although subcutaneously. These fat deposits may impair testicular thermoregulation and negatively affect the spermatogenesis in the seminiferous tubules, reducing both sperm quantity and quality. Further studies on the effect of high energy diets on bull fertility (as well as on rams and buck) are recommended, to evaluate the extension and duration of its detrimental effects on subsequent fertility.
- Full Text:
- Date Issued: 2001
- Authors: Labuschagné, Hermanus Stefanus
- Date: 2001
- Subjects: Bonsmara cattle
- Language: English
- Type: Thesis , Masters , MTech (Agricultural Management)
- Identifier: vital:10956 , http://hdl.handle.net/10948/58 , Bonsmara cattle
- Description: A study to evaluate the effect of feeding a high energy diet on the productive and reproductive characteristics of young bulls was carried out at two different locations in the Free State Province. Two trials were conducted with the aim of evaluating the effect of level of dietary energy and age of the bulls on their productive performance and reproductive characteristics. In the first trial, two levels of energy were fed to two groups of young (343 ± days) Bonsmara bulls. The high energy group HE (n=36) bulls were Phase-C performance tested in an official performance testing center and received a high energy diet for 112 days (28 days adaptation and 84 days testing). The medium energy group ME (n=18) bulls were phase-D performance tested and received a medium-energy diet for 140 days (28 days adaptation and 112 days testing). At the end of both performance testing periods, the productive performances and reproductive characteristics of the two groups were compared. The productive parameters compared included final live body weight (FLW), average daily gain (ADG), average daily gain per day of age (ADA) and body condition score (BCS). The reproductive parameters compared between groups included scrotal circumference (SC), semen volume (Vol) and concentration (SConO), mass movement (MV), linear motility (LM), percentage live sperm (LS), as well as percentage of total abnormalities: major (MD) and minor (MinD). The results of this trial indicated that in general, bulls from the HE group showed a significant (p<0.01) higher FLW, BCS, ADG and ADA, but a significant (p<0.01) lower volume and concentration of the ejaculate, lower mass movement and linear motility, lower percentage of live sperm and higher percentage of major defects and significantly (p<0.05) higher percentage of minor defects than the bulls from the ME group. In the second trial, 36 young Bonsmara bulls were divided into two groups according to their age at the arrival at an official Phase-C performance testing center. Older bulls (OB) (n=19) and younger bulls (YB) (n=17) all received a high energy diet for 112 days (28 days adaptation and 84 days testing). At the end of the Phase-C test the productive performances and reproductive characteristics of the two groups were compared. The animals from both groups that did not pass the Phase-C test, either due to poor performance or not meeting the breed standards, were slaughtered at an official abattoir and their scrotums and carcass characteristics were also compared. The productive parameters compared between the two groups included final live body weight (FLW), average daily gain (ADG), average daily gain per day of age (ADA), body condition score (BCS), feed conversion ratio (FCR), carcass weight both warm (CWW) and cold (CWC), as well as dressing percentage (CDP) and fat grade (CFG). The reproductive parameters compared between the two groups included scrotal circumference (SC), total scrotal weight (TSW), scrotal fat (SF), scrotal skin weight (SSW), paired testes weight (PTW), scrotal skin thickness (SST), total testes circumference (TTC), total testicle volume (TTV), weight of epididimis / spermatic cord (WESC), volume of epididymis / spermatic cord (VESC) and the percentage of bulls with depressed spermatogenesis (PBDS), semen concentration (SConO), mass movement (MV), linear motility (LM), percentage live sperm (LS), percentage of total abnormalities: major (MD) and minor(MinD) as well as the percentage of bulls with depressed spermatogenesis (PBDS). The results of this trial indicated that in general, the younger bulls showed a significant (p<0.05) higher ADG, but a significant (p<0.05) lower ADA than the older bulls. Regarding the reproductive organs compared, the younger bulls showed a significantly (p<0.01) higher total scrotal weight, scrotal fat and scrotal skin weight and thickness. No significant differences were observed on the testicular parameters measured between the two groups. In addition, both weight (WECS) and volume (VECS) of the epididymis / spermatic cord were significantly (P<0.05) higher in the older bulls. In general, the younger group showed poorer semen characteristics. A significantly (p<0.01) lower sperm concentration and linear movement and a significantly (p<0.05) higher percentage of major defects were recorded on the younger bulls, when compared to the older bulls. About half of the bulls in each group showed clear signs of depressed spermatogenesis in their seminiferous tubules, during the histological examination of testicular tissue. The results of this study indicates that high energy diets are beneficial for the productive performance of young bulls (growth rate, BCS and carcass characteristics), but have a detrimental effect on the reproductive characteristics of young bulls. The effect of high energy diets on both the productive and reproductive performances of young beef bulls are more pronounced at a younger age. High energy diets resulted in heavier scrotums in the younger bulls when compared to the older bulls, as a direct result of a higher fat deposition in this region without any relevant effect on testicular size. No intra-testicular fat deposition was observed. The scrotal fat observed in high energy fed young bulls accumulated mainly in the neck of the scrotum, although subcutaneously. These fat deposits may impair testicular thermoregulation and negatively affect the spermatogenesis in the seminiferous tubules, reducing both sperm quantity and quality. Further studies on the effect of high energy diets on bull fertility (as well as on rams and buck) are recommended, to evaluate the extension and duration of its detrimental effects on subsequent fertility.
- Full Text:
- Date Issued: 2001
The effect of increased propolis production on the productivity of a honeybee farming system
- Authors: De Jager, Andries Johannes
- Date: 2001
- Subjects: Propolis
- Language: English
- Type: Thesis , Masters , MTech (Agricultural Management)
- Identifier: vital:10952 , http://hdl.handle.net/10948/d1001743 , Propolis
- Description: This study was conducted to investigate a method for stimulating increased propolis production in Cape honeybee hives. The study took place near George situated in the Southern Cape region of South Africa. Standard Langstroth hives were used (n = 12) containing honeybee colonies of equal strength from the species Apis mellifera capensis. Propolis production in colonies equipped with commercial propolis traps (n = 6) was compared to propolis production in control colonies (n = 6). The strength of the colonies was determined by calculating the area of worker brood cells and the number of frames containing bees. For a ninemonth period propolis production, honey production, brood area, resin percentage, frames containing bees and income generated were measured on a monthly basis with the removal of the traps. There were no significant difference (p > 0.5) in honey production (24.66 ± 1.19 kg and 26.53 ± 1.31 kg), worker brood area (1967.3 ± 258.61 cm2 and 1085.4 ± 312.99 cm2) and frames containing bees (10 ± 1.13 frames and 9.8 ± 1.2 frames) between the hives with traps and hives without traps. However, propolis production was significantly influenced (p < 0.01) by the propolis traps, with the hives containing traps producing 361.87 ± 8.78g propolis compared to 38.2 ± 2.17g propolis in the control group. Propolis production in both control (28 g) and treatment groups (260.2 g) was significantly influenced by honey flow (p = 0.027). From December to March the production of honey was 22.12 (control) and 24.25 kg (treatment). A positive correlation was also found between frames containing bees and worker brood area (R = 0.73). Hives containing propolis traps were more profitable than the control group when honey and propolis income were pooled (467.17 ± 19.47 Rand vs. 353.8 ± 17.03 Rand). Therefore, the increased propolis production significantly improved profitability of the hive without affecting overall hive productivity.
- Full Text:
- Date Issued: 2001
- Authors: De Jager, Andries Johannes
- Date: 2001
- Subjects: Propolis
- Language: English
- Type: Thesis , Masters , MTech (Agricultural Management)
- Identifier: vital:10952 , http://hdl.handle.net/10948/d1001743 , Propolis
- Description: This study was conducted to investigate a method for stimulating increased propolis production in Cape honeybee hives. The study took place near George situated in the Southern Cape region of South Africa. Standard Langstroth hives were used (n = 12) containing honeybee colonies of equal strength from the species Apis mellifera capensis. Propolis production in colonies equipped with commercial propolis traps (n = 6) was compared to propolis production in control colonies (n = 6). The strength of the colonies was determined by calculating the area of worker brood cells and the number of frames containing bees. For a ninemonth period propolis production, honey production, brood area, resin percentage, frames containing bees and income generated were measured on a monthly basis with the removal of the traps. There were no significant difference (p > 0.5) in honey production (24.66 ± 1.19 kg and 26.53 ± 1.31 kg), worker brood area (1967.3 ± 258.61 cm2 and 1085.4 ± 312.99 cm2) and frames containing bees (10 ± 1.13 frames and 9.8 ± 1.2 frames) between the hives with traps and hives without traps. However, propolis production was significantly influenced (p < 0.01) by the propolis traps, with the hives containing traps producing 361.87 ± 8.78g propolis compared to 38.2 ± 2.17g propolis in the control group. Propolis production in both control (28 g) and treatment groups (260.2 g) was significantly influenced by honey flow (p = 0.027). From December to March the production of honey was 22.12 (control) and 24.25 kg (treatment). A positive correlation was also found between frames containing bees and worker brood area (R = 0.73). Hives containing propolis traps were more profitable than the control group when honey and propolis income were pooled (467.17 ± 19.47 Rand vs. 353.8 ± 17.03 Rand). Therefore, the increased propolis production significantly improved profitability of the hive without affecting overall hive productivity.
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- Date Issued: 2001
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