E. Oyieng , J.M.K. Ojango , M. Gauly , R. Mrode , R. Dooso , A.M. Okeyo , C. Kalinda , S. König
{"title":"半干旱区本地羊与外来羊杂交繁殖性状的评价。","authors":"E. Oyieng , J.M.K. Ojango , M. Gauly , R. Mrode , R. Dooso , A.M. Okeyo , C. Kalinda , S. König","doi":"10.1016/j.animal.2024.101391","DOIUrl":null,"url":null,"abstract":"<div><div>Reproduction traits are important factors determining the efficiency of any sheep production system. This study evaluates the age at first lambing (<strong>AFL</strong>), lambing interval (<strong>LI</strong>), litter weight at birth (<strong>LBWT</strong>), litter weight at weaning (<strong>LWWT</strong>), birth weight of ewe (<strong>EBWT</strong>) and weaning weight of ewes (<strong>EWWT</strong>) in a crossbreeding program between the Red Maasai (<strong>RRRR</strong>) and Dorper sheep and their crosses, 75% Dorper and 50% Dorper (<strong>DDRR)</strong> breeds. All the traits significantly (<em>P</em> < 0.05) differed across breeds and season of birth of the ewe. LBWT and LWWT were significantly affected by the sex of the lamb, type of birth of the lamb and parity in which the lambs were born in. AFL and LI had very high environmental variances. Overall heritability estimates of AFL (0.09 ± 0.04) and LI (0.00 ± 0.01) were not significant from zero while the heritability estimates for EBWT (0.38 ± 0.04), EWWT (0.23 ± 0.03), LBWT (0.19 ± 0.03) and LWWT (0.09 ± 0.02) were significant (<em>P</em> < 0.05). The RRRR had the highest genetic gain for all traits while the DDRR had a higher genetic gain among the crosses. LI had negative genetic correlations with LBWT (−0.53 ± 0.08) and LWWT (−0.28 ± 19.59) while AFL had positive genetic correlations with LBWT (0.27 ± 0.46) and LWWT (0.31 ± 0.34). The phenotypic trends for AFL and LWWT showed a negative and positive association, respectively, with the rainfall index over the years. With proper farm management, improved reproduction performance of ewes is possible by indirect selection using LBWT and LWWT for the Red Maasai, Dorper and their crosses within the semi-arid lands.</div></div>","PeriodicalId":50789,"journal":{"name":"Animal","volume":"19 1","pages":"Article 101391"},"PeriodicalIF":4.0000,"publicationDate":"2025-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":"{\"title\":\"Evaluating reproduction traits in a crossbreeding program between indigenous and exotic sheep in semi-arid lands\",\"authors\":\"E. Oyieng , J.M.K. Ojango , M. Gauly , R. Mrode , R. Dooso , A.M. Okeyo , C. Kalinda , S. König\",\"doi\":\"10.1016/j.animal.2024.101391\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"<div><div>Reproduction traits are important factors determining the efficiency of any sheep production system. This study evaluates the age at first lambing (<strong>AFL</strong>), lambing interval (<strong>LI</strong>), litter weight at birth (<strong>LBWT</strong>), litter weight at weaning (<strong>LWWT</strong>), birth weight of ewe (<strong>EBWT</strong>) and weaning weight of ewes (<strong>EWWT</strong>) in a crossbreeding program between the Red Maasai (<strong>RRRR</strong>) and Dorper sheep and their crosses, 75% Dorper and 50% Dorper (<strong>DDRR)</strong> breeds. All the traits significantly (<em>P</em> < 0.05) differed across breeds and season of birth of the ewe. LBWT and LWWT were significantly affected by the sex of the lamb, type of birth of the lamb and parity in which the lambs were born in. AFL and LI had very high environmental variances. Overall heritability estimates of AFL (0.09 ± 0.04) and LI (0.00 ± 0.01) were not significant from zero while the heritability estimates for EBWT (0.38 ± 0.04), EWWT (0.23 ± 0.03), LBWT (0.19 ± 0.03) and LWWT (0.09 ± 0.02) were significant (<em>P</em> < 0.05). The RRRR had the highest genetic gain for all traits while the DDRR had a higher genetic gain among the crosses. LI had negative genetic correlations with LBWT (−0.53 ± 0.08) and LWWT (−0.28 ± 19.59) while AFL had positive genetic correlations with LBWT (0.27 ± 0.46) and LWWT (0.31 ± 0.34). The phenotypic trends for AFL and LWWT showed a negative and positive association, respectively, with the rainfall index over the years. With proper farm management, improved reproduction performance of ewes is possible by indirect selection using LBWT and LWWT for the Red Maasai, Dorper and their crosses within the semi-arid lands.</div></div>\",\"PeriodicalId\":50789,\"journal\":{\"name\":\"Animal\",\"volume\":\"19 1\",\"pages\":\"Article 101391\"},\"PeriodicalIF\":4.0000,\"publicationDate\":\"2025-01-01\",\"publicationTypes\":\"Journal Article\",\"fieldsOfStudy\":null,\"isOpenAccess\":false,\"openAccessPdf\":\"\",\"citationCount\":\"0\",\"resultStr\":null,\"platform\":\"Semanticscholar\",\"paperid\":null,\"PeriodicalName\":\"Animal\",\"FirstCategoryId\":\"97\",\"ListUrlMain\":\"https://www.sciencedirect.com/science/article/pii/S1751731124003288\",\"RegionNum\":2,\"RegionCategory\":\"农林科学\",\"ArticlePicture\":[],\"TitleCN\":null,\"AbstractTextCN\":null,\"PMCID\":null,\"EPubDate\":\"\",\"PubModel\":\"\",\"JCR\":\"Q1\",\"JCRName\":\"AGRICULTURE, DAIRY & ANIMAL SCIENCE\",\"Score\":null,\"Total\":0}","platform":"Semanticscholar","paperid":null,"PeriodicalName":"Animal","FirstCategoryId":"97","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/S1751731124003288","RegionNum":2,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q1","JCRName":"AGRICULTURE, DAIRY & ANIMAL SCIENCE","Score":null,"Total":0}
Evaluating reproduction traits in a crossbreeding program between indigenous and exotic sheep in semi-arid lands
Reproduction traits are important factors determining the efficiency of any sheep production system. This study evaluates the age at first lambing (AFL), lambing interval (LI), litter weight at birth (LBWT), litter weight at weaning (LWWT), birth weight of ewe (EBWT) and weaning weight of ewes (EWWT) in a crossbreeding program between the Red Maasai (RRRR) and Dorper sheep and their crosses, 75% Dorper and 50% Dorper (DDRR) breeds. All the traits significantly (P < 0.05) differed across breeds and season of birth of the ewe. LBWT and LWWT were significantly affected by the sex of the lamb, type of birth of the lamb and parity in which the lambs were born in. AFL and LI had very high environmental variances. Overall heritability estimates of AFL (0.09 ± 0.04) and LI (0.00 ± 0.01) were not significant from zero while the heritability estimates for EBWT (0.38 ± 0.04), EWWT (0.23 ± 0.03), LBWT (0.19 ± 0.03) and LWWT (0.09 ± 0.02) were significant (P < 0.05). The RRRR had the highest genetic gain for all traits while the DDRR had a higher genetic gain among the crosses. LI had negative genetic correlations with LBWT (−0.53 ± 0.08) and LWWT (−0.28 ± 19.59) while AFL had positive genetic correlations with LBWT (0.27 ± 0.46) and LWWT (0.31 ± 0.34). The phenotypic trends for AFL and LWWT showed a negative and positive association, respectively, with the rainfall index over the years. With proper farm management, improved reproduction performance of ewes is possible by indirect selection using LBWT and LWWT for the Red Maasai, Dorper and their crosses within the semi-arid lands.
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animal attracts the best research in animal biology and animal systems from across the spectrum of the agricultural, biomedical, and environmental sciences. It is the central element in an exciting collaboration between the British Society of Animal Science (BSAS), Institut National de la Recherche Agronomique (INRA) and the European Federation of Animal Science (EAAP) and represents a merging of three scientific journals: Animal Science; Animal Research; Reproduction, Nutrition, Development. animal publishes original cutting-edge research, ''hot'' topics and horizon-scanning reviews on animal-related aspects of the life sciences at the molecular, cellular, organ, whole animal and production system levels. The main subject areas include: breeding and genetics; nutrition; physiology and functional biology of systems; behaviour, health and welfare; farming systems, environmental impact and climate change; product quality, human health and well-being. Animal models and papers dealing with the integration of research between these topics and their impact on the environment and people are particularly welcome.
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