该研究旨在通过分析来自59个父亲和227个水坝的445只动物的数据来评估Hardhenu牛的表现特征。研究的重点是估算奶牛繁殖和生产性状的(协)方差成分和遗传参数。最小二乘法分析的结果表明产仔期(POC)对关键生产性状有显著影响(p<.01),包括第一次泌乳产奶量(FLMY),300天牛奶产量(FLMY300),研究人群的第一峰产奶量(FPY)和总泌乳产奶量(TLMY)。这些性状的最小二乘平均值报告如下:FLMY(2665.68±45.66kg),FLMY300(2425.52±34.41kg),FLL(312.95±3.83天),Hardhenu牛的FPY(11.52±0.15kg)和TLMY(9282.44±167.03kg)。在被研究的人群中,发现仅存在加性遗传变异性,并且对资源种群中的目标性状没有任何显着的母体效应。FLMY的直接遗传力估计(h2),FLMY300,FLL,FPY,Hardhenu牛的TLMY和其他性状范围为0.03至0.41。这些发现为影响性能特征的遗传因素提供了有价值的见解,有助于加强Hardhenu牛的育种和管理实践。
The study aimed to assess performance traits in Hardhenu
cattle by analysing data from 445 animals born to 59 sires and 227 dams. The investigation focused on estimating (co)variance components and genetic parameters for reproduction and production traits in dairy
cattle. Results from least-squares analysis indicated a significant effect (p < .01) of the period of calving (POC) on key production traits, including first lactation milk yield (FLMY), 300-day milk yield (FLMY300), first peak yield (FPY) and total lactation milk yield (TLMY) in studied population. The least squares means for these traits were reported as follows: FLMY (2665.68 ± 45.66 kg), FLMY300 (2425.52 ± 34.41 kg), FLL (312.95 ± 3.83 days), FPY (11.52 ± 0.15 kg) and TLMY (9282.44 ± 167.03 kg) in Hardhenu
cattle. In the studied population, only additive genetic variability was found to be present and there was absence of any significant maternal effect with respect to targeted traits in the resource population. Direct heritability estimates (h2) for FLMY, FLMY300, FLL, FPY, TLMY and other traits ranged from 0.03 to 0.41 in Hardhenu
cattle. These findings offer valuable insights into the genetic factors influencing performance traits, contributing to the enhancement of breeding and management practices in Hardhenu
cattle.