Productive performance of hair and wool type Dorper sheep under extensive conditions

Snyman, M.A.; Olivier, W.J.

doi:10.1016/s0921-4488(02)00116-5

Cited by 12 publications

(8 citation statements)

References 3 publications

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“…Similar values were reported for birth weight of Gumuz sheep (Abegaz 2007), Afar and Blackhead somali sheep (Yacob 2008), indigenous sheep in the cool highlands (Hassen et al 2002) and Horro sheep (Abegaz et al 2002). The birth weight of Washera sheep, however, was heavier than the birth weight of Menz sheep (Awgichew 2000;Gizaw 2002;Tibbo 2006) and lighter than some other tropical sheep breeds elsewhere in Africa (Snyman and Olivier 2002). All the fixed effects considered except season of birth had significantly (P<0.05) affected birth weight of lambs.…”

Section: Birth Weightsupporting

confidence: 68%

Growth performances of Washera sheep under smallholder management systems in Yilmanadensa and Quarit districts, Ethiopia

Abebe

Gizaw

Dugassa

et al. 2009

Trop Anim Health Prod

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A study was conducted to evaluate growth performances of Washera sheep under smallholder production systems in the Yilmanadensa and Quarit districts of the Amhara National Regional State, Ethiopia. Data were collected and analysed on the growth of 690 lambs owned by 110 households from October 2004 to September 2007. Weight (kilograms) of Washera lambs at birth, 1, 3, 6, 9 and 12 months of age was 2.69 +/- 0.02, 7.10 +/- 0.16, 12.42 +/- 0.11, 16.12 +/- 0.91, 20.05 +/- 0.55 and 23.47 +/- 0.68, respectively. Birth weight was significantly (P < 0.05) affected by district, year of birth, parity of the dam, birth type and sex of lamb and by the interaction effect of parity by birth type and parity by sex of lamb. Weaning weight was also affected by year of birth, type of birth and sex of lamb. Yearling weight was affected by only year of birth and sex of birth. The average daily weight gain (ADG; grams) from birth to 30 days, birth to 90 days, 90 to 180 days and birth to 1 year of age was 143.37 +/- 13.46, 107.09 +/- 2.67, 39.78 +/- 9.73 and 60.13 +/- 1.89, respectively. Growth rates from birth to 30 and 90 days of age were significantly (P < 0.05) affected by birth year, birth type and sex. ADG from birth to 1 year of age was affected by lamb sex and district. The indigenous Washera sheep had faster growth rate than those sheep breeds of Ethiopia extensively studied thus far. Integrated efforts combining improved nutrition, health and participatory community-based breeding would help the smallholder farmers to utilise and conserve this immense sheep genetic resource of Ethiopia.

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Section: Birth Weightsupporting

confidence: 68%

Growth performances of Washera sheep under smallholder management systems in Yilmanadensa and Quarit districts, Ethiopia

Abebe

Gizaw

Dugassa

et al. 2009

Trop Anim Health Prod

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“…Two lines differing markedly in their cover were established and evaluated from 1993 to 2000. No differences in traits of economic importance were detected between the lines (Snyman and Olivier, 2002b). Carcass conformation suggested that hair-type animals were more compact in build, whereas wool-type animals appeared to be rangier.…”

Section: Klerefontein Dorper Flockmentioning

confidence: 81%

“…Perceptions in the South African Dorper industry were that animals with a hairy cover should be hardier than animals with a more woolly cover (Snyman and Olivier, 2002b). Two lines differing markedly in their cover were established and evaluated from 1993 to 2000.…”

Section: Klerefontein Dorper Flockmentioning

confidence: 99%

Returns on investment in sheep and goat breeding in South Africa

2010

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a r t i c l e i n f o a b s t r a c t Available online xxxxThe small stock industry in South Africa is of crucial importance as 80% of the agricultural land is unsuitable for intensive agricultural production. The contribution of 19 resource sheep flocks and goat herds towards breeding objective formulation, genetic improvement and parameter estimation was summarized. Substantial genetic gains resulting from selection for a range of economically important traits were demonstrated, lending impetus to the development and extension of the National Small Stock Improvement Scheme (NSIS). Responses in monetary values in the respective participating small stock breeds ranged from R0.098 for the Dormer to R0.818 for the S.A. Mutton Merino per small stock unit per annum for animals born in the interval from 2000 to 2006. This response is well below what was attained in the resource flocks and in the best participating flocks and herds. Even with this less than optimal change on a national basis, the impact on the sectoral economy is substantial. When related to the cost associated with the NSIS, this improvement is highly cost-effective. The impact of research and development in the small stock industry is therefore substantial, and the small stock industry is foreseen to continue playing an integral role in the national economy.

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“…In a later study, Snyman and Olivier (2002) reported that 84% of Dorper ewes mated produced lambs, resulting in a lambing percentage (lambs born/ewes mated) of 126%, a ewe fecundity of 150%, and a weaning percentage (lambs weaned/ewes mated) of 114%. Survival rate from birth to weaning was 90%.…”

Section: Biological Characteristics Reproductionmentioning

confidence: 96%

Introduction of Dorper sheep into Australian rangelands: implications for production and natural resource management

Alemseged

Hacker

2014

Rangel. J.

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Abstract. The growing popularity of the Dorper breed of sheep potentially may have implications for the ecological sustainability of the semiarid and arid rangelands of southern Australia. The implications are heightened by forecasts of a warming and drying climate in these rangelands, which may in itself place native vegetation under increasing stress. While the Dorper breed of sheep offers important production advantages, little is known from research under Australian conditions about their grazing ecology and management requirements from a natural resource perspective. Key factors identified from this review of literature from other countries include a high fertility and fecundity, a generalist feeding strategy, a high growth rate and a capacity to survive and reproduce under low-rainfall conditions. The wider range of plant species selected by the Dorper compared with the traditional Merino breed of sheep potentially creates both opportunities and risks for rangeland condition. Less selective grazing may reduce pressure on some species but the capacity to harvest sufficient nutrients over a smaller area could concentrate grazing and promote resource degradation. High reproductive efficiency under a wide range of seasonal conditions may lead to more rapid onset of overgrazing and will require close attention to both natural resources and animal marketing if resource degradation is to be avoided.

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Productive performance of hair and wool type Dorper sheep under extensive conditions

Cited by 12 publications

References 3 publications

Growth performances of Washera sheep under smallholder management systems in Yilmanadensa and Quarit districts, Ethiopia

Growth performances of Washera sheep under smallholder management systems in Yilmanadensa and Quarit districts, Ethiopia

Returns on investment in sheep and goat breeding in South Africa

Introduction of Dorper sheep into Australian rangelands: implications for production and natural resource management

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