Abstract：
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.
摘要：
这项研究的目的是通过采用加性和母体效应来评估Murrah水牛的首次泌乳生产和繁殖性状的遗传参数。收集了1997年至2020年640只Murrah水牛的谱系和特定性状的数据。这些性状包括首次泌乳产奶量(FLMY)，305天首次泌乳产奶量（305FLMY），第一泌乳长度（FLL），第一泌乳峰值产量(FPY)，第一个服务期(FSP)，第一产卵间隔(FCI)和第一干燥期(FDP)。遗传评估采用六种单变量动物模型，考虑直接和产妇的影响，由THRGIBBS1F90和POSTGIBBSF90计划推动。分析中包括的固定因素是产卵期，产卵的季节和第一次产卵的年龄。直接遗传力的贝叶斯估计，从最合适的模型中得出，分别为：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。发现产妇的影响显著，从5%到10%不等，在模型2和模型5下的第一个泌乳性状中。此外,在研究的性状中观察到正相关和显着的遗传和表型相关性。总之,基于305天首次泌乳产奶量的选择表明，Murrah水牛具有遗传增强的潜力，提倡将其纳入育种计划，以增强早期表现。此外，考虑母体的影响对于动物的遗传进步是必要的。
