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首页> 美国卫生研究院文献>Open Veterinary Journal >Comparison of several methods of sires evaluation for total milk yield in a herd of Holstein cows in Yemen
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Comparison of several methods of sires evaluation for total milk yield in a herd of Holstein cows in Yemen

机译：也门几种荷斯坦奶牛总奶产量的几种评估方法的比较

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A total of 956 lactation records of Holstein cows kept at Kaa Albon station, Imuran Governorate, Yemen during the period from 1991 to 2003 were used to investigate the effect of some genetic and non-genetic factors (Sire, parity, season of calving, year of calving and age at first calving as covariate) on the Total Milk Yield (TMY), Lactation Length (LL), and Dry Period (DP). Components of variance for the random effects (mixed model) were estimated by Restricted Maximum Likelihood (REML) methodology. Sires were evaluated for the TMY by three methods, Best Linear Unbiased Prediction (BLUP) using Harvey program, Transmitting Ability (TA) according to the Least Square Means of sire progeny (TALSM) and according to Means (TAM). Results showed that TMY and DP were affected significantly (P < 0.01) by all factors except season of calving and age at first calving, while LL was affected significantly (P< 0.01) only by year of calving and parity. The averages of the TMY, LL, and DP were 3919.66 kg, 298.28 days, and 114.13 days respectively. The corresponding estimates of heritability (h2) were 0.35, 0.06, and 0.14 respectively. The highest and lowest BLUP values of sires for the TMY were – 542.44 kg and 402.14 kg, while the corresponding estimates for TALSM and TAM were – 470.38, 380.88 kg and – 370.12, 388.50 kg respectively. The Spearman rank correlation coefficients among BLUP, TALSM and TAM ranged from 0.81 to 0.67. These results provide evidence that the selection of sires will improve the TMY in this herd because of the wide differences in genetic poetical among sires, and a moderate estimation of heritability.
机译：1991年至2003年期间在也门伊村省Kaa Albon站饲养的总共956头荷斯坦奶牛的泌乳记录用于调查某些遗传和非遗传因素的影响（父亲，胎次，产犊季节，年份）产犊率和首次产犊的年龄作为协变量）对总产奶量（TMY），哺乳期（LL）和干旱期（DP）的影响。随机效应（混合模型）的方差成分通过限制最大似然法（REML）进行估算。通过三种方法对小胡蜂的TMY进行评估，一种是使用Harvey程序的最佳线性无偏预测（BLUP），另一种是根据子代后代的最小二乘均值（TALSM）和均值（TAM）进行的传递能力（TA）。结果表明，除产犊季节和首次产犊年龄外，所有因素均显着影响TMY和DP（P <0.01），而仅受产犊和同胎年份，LL显着影响（P <0.01）。 TMY，LL和DP的平均值分别为3919.66千克，298.28天和114.13天。遗传力的相应估计值（h 2 ）分别为0.35、0.06和0.14。 TMY父本的最高BLUP值和最低BLUP值分别为– 542.44 kg和402.14 kg，而TALSM和TAM的相应估计分别为– 470.38、380.88 kg和– 370.12、388.50 kg。 BLUP，TALSM和TAM之间的Spearman等级相关系数在0.81至0.67之间。这些结果提供了证据，表明父系的选择将改善该群的TMY，因为父系之间的遗传诗学差异很大，并且对遗传力的估计适中。

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