这项研究是为了确定添加剂,使用六个单变量动物模型,这些模型在(协)方差分量上有所不同,适合使用似然比检验在Murrah水牛中评估母体效应的重要性。从水牛农场保存的历史谱系表中收集了614种与生产性状相关的Murrah水牛的数据,畜牧业生产和管理部(LPM),LUVAS,希萨尔.本研究下的生产性状为305天产奶量(305DMY),峰值产量(PY),泌乳长度(LL),干燥期(DP),泌乳产奶量(LMY)和湿平均值(WA)。305DMY的遗传力估计值在0.33-0.44的范围内,PY为0.25-0.51,LL为0.05-0.13,0.03-0.23对于DP,LMY为0.17-0.40,WA为0.37-0.66。模型1被认为是大多数特征的最佳选择,viz.,305DMY,PY,LL,LMY和WA之后是DP的模型2。性状内的协方差和相关值导致模型3和模型6的遗传力膨胀。在性状LMY中发现了加性效应和母体效应之间的最大协方差,在模型3中为14,183.90,在模型6的相同性状中也报告了最小值,值为-3522.37。多变量分析表明,除DP外,所有生产性状均为中高,且呈正相关,与遗传和表型呈负相关。6个模型中育种价值的Spearman等级相关系数均较高且显著,除DP外,所有性状的范围为0.78至1.00,因此,根据数据的可用性,可以考虑任何模型。
The study was done to determine additive, maternal and common permanent environmental effects and best-suited model for some production traits using six univariate animal models that differed in the (co)variance components fitted to assess the importance of maternal effect using likelihood ratio test in Murrah buffaloes. Data from 614 Murrah buffaloes related to production traits were collected from history pedigree sheets maintained at the buffalo farm, Department of Livestock Production and Management (LPM), LUVAS, Hisar. The production traits under this study were 305 days milk yield (305DMY), peak yield (PY), lactation length (LL), dry period (DP), lactation milk yield (LMY) and wet average (WA). The heritability estimates were in the range of 0.33-0.44 for 305DMY, 0.25-0.51 for PY, 0.05-0.13 for LL, 0.03-0.23 for DP, 0.17-0.40 for LMY and 0.37-0.66 for WA. Model 1 was considered best for most of the traits, viz., 305DMY, PY, LL, LMY and WA followed by model 2 for DP. Covariance and correlated values within the traits caused inflation of heritability in model 3 and model 6. The maximum covariance between the additive and maternal effect was found in trait LMY, which was 14,183.90 in model 3 and the minimum value was also reported in the same trait for model 6, valued at -3522.37. Multivariate analysis showed that all production traits were moderate to high and positively correlated with each other except for DP, which was low and negative genetic and phenotypic correlated. Spearman\'s rank correlation coefficients of breeding value among all six models were high and significant, ranged from 0.78 to 1.00 for all the traits except DP, therefore any of the models could be taken into account depending upon the availability of data.