Genetic and environmental influences on beef cattle production in Zambia. 4. Weaner production from purebred and reciprocally crossbred dams
Dam reproductive performance of purebred Africander, Angoni, Barotse and Boran, and reciprocal crossbreds of the latter 3 breeds under ranching conditions were investigated. Mean performance based on a maximum of 1996 records collected over six parities were: calving rate, 65.6%; weaning weight rate, 62.8%; calf birth weight, 26.6 kg; calf weaning weight, 163.6 kg; and dam live weight at weaning 363.0 kg. Comparative evaluations of dam performance indicated that there were no differences between reciprocal crossbred dams for calving and weaning percentages; dam status at mating had an important effect on fertility; there were large differences between breeds for calf weights but heterosis estimates were small and non-significant; there were no differences between progeny weights of reciprocal crossbred dams; dams which lost most live weight during the breeding season had significantly poorer fertility. Sex, date and period of birth, and dam status had significant effects on calf weight. Overall estimates of heritability derived by dam/daughter regression were 0.20 for calving percentage, 0.76 for calf birth weight and 0.72 for weaning weight.
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Format: | Journal Article biblioteca |
Language: | English |
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Cambridge University Press
1981-10
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Subjects: | reproduction, cattle, breeds, genetics, environment, weaning weight, pure lines, crossbreds, parturition, weaning, |
Online Access: | https://hdl.handle.net/10568/66854 https://doi.org/10.1017/S0003356100040605 |
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dig-cgspace-10568-668542023-12-08T19:36:04Z Genetic and environmental influences on beef cattle production in Zambia. 4. Weaner production from purebred and reciprocally crossbred dams Thorpe, W.R. Cruickshank, D.K.R. Thompson, R. reproduction cattle breeds genetics environment weaning weight pure lines crossbreds parturition weaning Dam reproductive performance of purebred Africander, Angoni, Barotse and Boran, and reciprocal crossbreds of the latter 3 breeds under ranching conditions were investigated. Mean performance based on a maximum of 1996 records collected over six parities were: calving rate, 65.6%; weaning weight rate, 62.8%; calf birth weight, 26.6 kg; calf weaning weight, 163.6 kg; and dam live weight at weaning 363.0 kg. Comparative evaluations of dam performance indicated that there were no differences between reciprocal crossbred dams for calving and weaning percentages; dam status at mating had an important effect on fertility; there were large differences between breeds for calf weights but heterosis estimates were small and non-significant; there were no differences between progeny weights of reciprocal crossbred dams; dams which lost most live weight during the breeding season had significantly poorer fertility. Sex, date and period of birth, and dam status had significant effects on calf weight. Overall estimates of heritability derived by dam/daughter regression were 0.20 for calving percentage, 0.76 for calf birth weight and 0.72 for weaning weight. 1981-10 2015-06-05T12:18:02Z 2015-06-05T12:18:02Z Journal Article Thorpe, W., Cruickshank, D.K.R and R. Thompson. 1981. Genetic and environmental influences on beef cattle production in Zambia. 4. Weaner production from purebred and reciprocally crossbred dams. 33(2): 165-177. 0003-3561 https://hdl.handle.net/10568/66854 https://doi.org/10.1017/S0003356100040605 en Limited Access p. 165-177 Cambridge University Press Animal Production |
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reproduction cattle breeds genetics environment weaning weight pure lines crossbreds parturition weaning reproduction cattle breeds genetics environment weaning weight pure lines crossbreds parturition weaning |
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reproduction cattle breeds genetics environment weaning weight pure lines crossbreds parturition weaning reproduction cattle breeds genetics environment weaning weight pure lines crossbreds parturition weaning Thorpe, W.R. Cruickshank, D.K.R. Thompson, R. Genetic and environmental influences on beef cattle production in Zambia. 4. Weaner production from purebred and reciprocally crossbred dams |
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Dam reproductive performance of purebred Africander, Angoni, Barotse and Boran, and reciprocal crossbreds of the latter 3 breeds under ranching conditions were investigated. Mean performance based on a maximum of 1996 records collected over six parities were: calving rate, 65.6%; weaning weight rate, 62.8%; calf birth weight, 26.6 kg; calf weaning weight, 163.6 kg; and dam live weight at weaning 363.0 kg. Comparative evaluations of dam performance indicated that there were no differences between reciprocal crossbred dams for calving and weaning percentages; dam status at mating had an important effect on fertility; there were large differences between breeds for calf weights but heterosis estimates were small and non-significant; there were no differences between progeny weights of reciprocal crossbred dams; dams which lost most live weight during the breeding season had significantly poorer fertility. Sex, date and period of birth, and dam status had significant effects on calf weight. Overall estimates of heritability derived by dam/daughter regression were 0.20 for calving percentage, 0.76 for calf birth weight and 0.72 for weaning weight. |
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Journal Article |
topic_facet |
reproduction cattle breeds genetics environment weaning weight pure lines crossbreds parturition weaning |
author |
Thorpe, W.R. Cruickshank, D.K.R. Thompson, R. |
author_facet |
Thorpe, W.R. Cruickshank, D.K.R. Thompson, R. |
author_sort |
Thorpe, W.R. |
title |
Genetic and environmental influences on beef cattle production in Zambia. 4. Weaner production from purebred and reciprocally crossbred dams |
title_short |
Genetic and environmental influences on beef cattle production in Zambia. 4. Weaner production from purebred and reciprocally crossbred dams |
title_full |
Genetic and environmental influences on beef cattle production in Zambia. 4. Weaner production from purebred and reciprocally crossbred dams |
title_fullStr |
Genetic and environmental influences on beef cattle production in Zambia. 4. Weaner production from purebred and reciprocally crossbred dams |
title_full_unstemmed |
Genetic and environmental influences on beef cattle production in Zambia. 4. Weaner production from purebred and reciprocally crossbred dams |
title_sort |
genetic and environmental influences on beef cattle production in zambia. 4. weaner production from purebred and reciprocally crossbred dams |
publisher |
Cambridge University Press |
publishDate |
1981-10 |
url |
https://hdl.handle.net/10568/66854 https://doi.org/10.1017/S0003356100040605 |
work_keys_str_mv |
AT thorpewr geneticandenvironmentalinfluencesonbeefcattleproductioninzambia4weanerproductionfrompurebredandreciprocallycrossbreddams AT cruickshankdkr geneticandenvironmentalinfluencesonbeefcattleproductioninzambia4weanerproductionfrompurebredandreciprocallycrossbreddams AT thompsonr geneticandenvironmentalinfluencesonbeefcattleproductioninzambia4weanerproductionfrompurebredandreciprocallycrossbreddams |
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1787230421131460608 |