Department of Animal Genetics & Breeding, Lala Lajpat Rai University of Veterinary and Animal Sciences, Hisar, Haryana, India.
Department of Livestock Production Management, Lala Lajpat Rai University of Veterinary and Animal Sciences, Hisar, Haryana, India.
Reprod Domest Anim. 2024 Jul;59(7):e14675. doi: 10.1111/rda.14675.
The aim of this research was to assess genetic parameters for first lactation production and reproduction traits in Murrah buffaloes by employing additive and maternal effects. Data on pedigree and specific traits of 640 Murrah buffaloes were gathered from 1997 to 2020. These traits encompassed first lactation milk yield (FLMY), 305-day first lactation milk yield (305FLMY), first lactation length (FLL), first lactation peak yield (FPY), first service period (FSP), first calving interval (FCI) and first dry period (FDP). Genetic evaluations employed six univariate animal models, accounting for both direct and maternal effects, facilitated by THRGIBBS1F90 and POSTGIBBSF90 programs. Fixed factors included in the analysis were period of calving, season of calving and age at first calving. The Bayesian estimates for direct heritability, derived from the most suitable model, were as follows: FLMY: 0.28 ± 0.01, 305FLMY: 0.30 ± 0.01, FLL: 0.19 ± 0.01, FPY: 0.18 ± 0.01, FSP: 0.12 ± 0.01, FCI: 0.14 ± 0.01 and FDP: 0.12 ± 0.01. Maternal effects were found significant, ranging from 5% to 10%, in first lactation traits under Model 2 and Model 5. Additionally, positive and significant genetic and phenotypic correlations were observed among the studied traits. In conclusion, selection based on 305-day first lactation milk yield suggests potential for genetic enhancement in Murrah buffaloes, advocating its inclusion in breeding programmes to bolster early performance. Also, consideration of maternal influences is necessary for genetic progress of animals.
本研究旨在通过加性和母体效应评估摩拉水牛初乳生产和繁殖性状的遗传参数。1997 年至 2020 年期间，从 pedigree 数据和 640 头摩拉水牛的特定性状中收集数据。这些性状包括第一泌乳期产奶量（FLMY）、305 天第一泌乳期产奶量（305FLMY）、第一泌乳期长度（FLL）、第一泌乳期高峰产奶量（FPY）、第一配种期（FSP）、第一产犊间隔（FCI）和第一干奶期（FDP）。遗传评估采用了六个单变量动物模型，考虑了直接和母体效应，由 THRGIBBS1F90 和 POSTGIBBSF90 程序辅助。分析中包含的固定因素有产犊期、产犊季节和初产年龄。从最合适的模型中得出的直接遗传力贝叶斯估计值如下：FLMY：0.28±0.01、305FLMY：0.30±0.01、FLL：0.19±0.01、FPY：0.18±0.01、FSP：0.12±0.01、FCI：0.14±0.01 和 FDP：0.12±0.01。母体效应在模型 2 和模型 5 下的初乳性状中被发现显著，范围从 5%到 10%。此外，研究性状之间存在正显著遗传和表型相关。总之，基于 305 天第一泌乳期产奶量的选择表明摩拉水牛有遗传改良的潜力，建议将其纳入育种计划以提高早期性能。此外，考虑母体影响对于动物的遗传进展是必要的。
