Breed and environmental influences on weaner lamb production in Zimbabwe

Manyuchi, B.; Tawonezvi, H.P.R.; Chiwara, R. M.

doi:10.1007/bf02361196

Cited by 9 publications

(4 citation statements)

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“…The indigenous Sabi sheep have a good mothering ability. The singles were found to have significantly (p<0.01) higher weaning weights in indigenous Sabi sheep than twins this is in agreement with literature findings (Manyuchi et al, 1990;Matika, 1995). The differences between singles and twins were 0.05, 0.06 and 0.78 kg for Mutton Merino, Dorper and the indigenous Sabi sheep.…”

Section: Effect Of Birth Status On Birth Weight and Weaning Weightsupporting

confidence: 91%

The Effect of Non-genetic Factors on Birth Weight and Weaning Weight in Three Sheep Breeds of Zimbabwe

Assan¹,

Makuza²

2005

Asian Australas. J. Anim. Sci

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Sheep production is affected by genetic and non-genetic factors. A knowledge of these factors is essential for efficient management and for the accurate estimation of breeding values. The objective of this study was to establish the non-genetic factors which affect birth weight and weaning weight in Dorper, Mutton Merino and indigenous Sabi sheep breeds. A total of 2,625 birth and weaning weight records from Grasslands Research Station collected from 1991 through 1993, were used. The records were collected from indigenous Sabi (939), Dorper (807) and Mutton Merino (898) sheep. A mixed classification model containing the fixed effects of year, birth status and sex was used for identification of non-genetic factors. Sire within breed was included as a random effect. Two factor interactions and three factor interactions were important in indigenous Sabi, Mutton Merino and Dorper sheep. The mean birth weights were 4.37±0.04 kg, 4.62±0.04 kg and 3.29±0.04 kg for Mutton Merino, Dorper and Sabi sheep, respectively. Sire had significant effects (p<0.05) on birth weight in Mutton Merino and indigenous Sabi sheep. Year of lambing had significant effects (p<0.05) on birth weight in indigenous Sabi, Mutton Merino and Dorper sheep.The effect of birth status was non significant in Dorper and Mutton Merino sheep while effect of birth status was significant on birth weight in indigenous Sabi sheep. In Indigenous Sabi sheep lambs born as singles (3.30±0.05 kg) were 0.23 kg heavier than twins (3.07±0.05 kg), in Mutton Merino lambs born as singles (3.99±0.08 kg) were 0.07 kg heavier than twins (3.92±0.08 kg) and in Dorper lambs born as singles (4.41±0.04 kg) were 0.02 kg heavier than twins (4.39±0.04 kg). On average males were heavier than females (p<0.05) weighing (3.32±0.04 kg vs. 3.05±0.07 kg) in indigenous Sabi, 4.73±0.03 kg vs. 4.08±0.05 in Dorper and 4.26±0.07 kg vs. 3.66±0.09 kg in Mutton Merino sheep. Two way factor interactions of sire * year, year * sex and sex * birth status had significant effects (p<0.05) on birth weight in indigenous Sabi, Mutton Merino and Dorper sheep while the effect of year * birth status was non significant on birth weight in Indigenous Sabi sheep. The three way factor interaction of year * sex * birth status had a significant effect (p<0.01) on birth weight in indigenous Sabi and Mutton Merino. Tupping weight fitted as a covariate had significant effects (p<0.001) on birth weight in indigenous Sabi, Mutton Merino and Dorper sheep. The mean weaning weights were 17.94±0.31 kg, 18.19±0.28 kg and 14.39±0.28 kg for Mutton Merino, Dorper and Indigenous Sabi sheep, respectively. Effects of sire and sire * year were non significant on weaning weight in Dorper and Mutton Merino while year, sex and sex * year interaction had significant effects (p<0.001) on weaning weight. On average males were heavier than females (p<0.001) at weaning. The respective weaning weights were 18.05±0.46 kg, 18.68±0.19 kg, 14.14±0.15 kg for males and 16.64±0.60 kg, 16.41±0.31 kg, 12.64±0.32 kg for females in Mutton Merino, Dor...

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Section: Effect Of Birth Status On Birth Weight and Weaning Weightsupporting

confidence: 91%

The Effect of Non-genetic Factors on Birth Weight and Weaning Weight in Three Sheep Breeds of Zimbabwe

Assan¹,

Makuza²

2005

Asian Australas. J. Anim. Sci

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“…Columbia ewes had a higher stayability rate at 5 years compared with Targhee ewes [29]. Mutton Merino ewes had a higher stayability rate at 6 years compared with Dorper ewes [15]. A breed effect on longevity among purebred ewes was also found by Kern et al [30], but not by Nawaz et al [16].…”

Section: Resultsmentioning

confidence: 99%

“…Nawaz et al [16] reported greater cumulative lamb numbers and weights over 4 years for Polypay compared with Coopworth straightbred ewes. Mutton Merino ewes had higher 6-year cumulative weaned lamb number and weight output compared with Dorper ewes [15]. Columbia ewes had higher 5-year cumulative lamb number and weight weaned than Targhee ewes [29].…”

Section: Resultsmentioning

confidence: 99%

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Comparison of Boer, Kiko, and Spanish meat goat does for stayability and cumulative reproductive output in the humid subtropical southeastern United States

Pellerin

Browning

2012

BMC Vet Res

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BackgroundLongevity is the amount of time breeding females stay active in a herd by avoiding death or culling because of illness or reproductive failure. This is a trait of economic relevance in commercial small ruminant breeding herds as it affects lifetime reproductive output. The purpose of this study was to determine if breed of meat goat influences breeding doe survival rates and cumulative reproductive performance under semi-intensive management.ResultsBoer (n = 132), Kiko (n = 92) and Spanish (n = 79) does were evaluated for longevity trends and cumulative kid production. The herd was managed on humid subtropical pasture. Does had the chance to complete 2 to 6 production years. Survival curves were analyzed for 2 culling methods. The actual culling practice removed does after two failures to wean a kid. An alternative culling protocol removed doe records after the first failure to wean a kid. Kid production traits analyzed across herd life were the total number of kids weaned and cumulative kid weight weaned to the 2-, 3-, and 5-year stayability endpoints. Most (82%) doe exits were illness-related under the actual culling method. Reproductive failure represented 51% of doe exits under the alternative culling protocol. Boer does had greater survival declines (P < 0.01) from 2 to 6 years of herd life compared with Kiko and Spanish under both culling protocols. Boer does had lower stayability rates (P < 0.01) at each year endpoint for both culling protocols. Under the alternative protocol, over 50% of Boer does failed to complete 2 years, whereas over 50% of Kiko and Spanish does successfully completed 4 years. Boer does had lower (P < 0.01) total number of kids weaned and cumulative weight weaned through each stayability endpoint compared with Kiko and Spanish.ConclusionBoer does had low stayability and cumulative kid production rates compared with Kiko and Spanish does. Poor health was the primary driver of does exiting the herd. Kiko and Spanish does did not differ for longevity and lifetime performance indicators.

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Effect of progestagen and PMSG on oestrous synchronization and fertility in Dorper ewes during the transition period

Zeleke

Greyling

Schwalbach

et al. 2005

Small Ruminant Research

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Breed and environmental influences on weaner lamb production in Zimbabwe

Cited by 9 publications

References 5 publications

The Effect of Non-genetic Factors on Birth Weight and Weaning Weight in Three Sheep Breeds of Zimbabwe

The Effect of Non-genetic Factors on Birth Weight and Weaning Weight in Three Sheep Breeds of Zimbabwe

Comparison of Boer, Kiko, and Spanish meat goat does for stayability and cumulative reproductive output in the humid subtropical southeastern United States

Effect of progestagen and PMSG on oestrous synchronization and fertility in Dorper ewes during the transition period

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