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Somatic Cells Count and Its Genetic Association with Milk Yield in Dairy Cattle Raised under Thai Tropical Environmental Conditions

机译:泰国热带环境条件下饲养的奶牛体细胞计数及其与产奶量的遗传关联

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摘要

Somatic cells count (SCC), milk yield (MY) and pedigree information of 2,791 first lactation cows that calved between 1990 and 2010 on 259 Thai farms were used to estimate genetic parameters and trends for SCC and its genetic association with MY. The SCC were log-transformed (lnSCC) to make them normally distributed. An average information-restricted maximum likelihood procedure was used to estimate variance components. A bivariate animal model that considered herd-yr-season, calving age, and regression additive genetic group as fixed effects, and animal and residual as random effects was used for genetic evaluation. Heritability estimates were 0.12 (SE = 0.19) for lnSCC, and 0.31 (SE = 0.06) for MY. The genetic correlation estimate between lnSCC and MY was 0.26 (SE = 0.59). Mean yearly estimated breeding values during the last 20 years increased for SCC (49.02 cells/ml/yr, SE = 26.81 cells/ml/yr; p = 0.08), but not for MY (0.37 kg/yr, SE = 0.87 kg/yr; p = 0.68). Sire average breeding values for SCC and MY were higher than those of cows and dams (p<0.01). Heritability estimates for lnSCC and MY and their low but positive genetic correlation suggested that selection for low SCC may be feasible in this population as it is in other populations of dairy cows. Thus, selection for high MY and low SCC should be encouraged in Thai dairy improvement programs to increase profitability by improving both cow health and milk yield.
机译:1990年至2010年之间在259个泰国农场产犊的2,791头第一头泌乳牛的体细胞计数(SCC),产奶量(MY)和谱系信息用于估算SCC的遗传参数和趋势以及与MY的遗传关联。对SCC进行对数转换(lnSCC),以使其呈正态分布。使用平均信息限制的最大似然程序来估计方差分量。将牛群-季节,产犊年龄和回归加性遗传组视为固定效应,将动物和残留作为随机效应的双变量动物模型用于遗传评估。 lnSCC的遗传力估计值为0.12(SE = 0.19),而MY的遗传力估计值为0.31(SE = 0.06)。 lnSCC和MY之间的遗传相关性估计为0.26(SE = 0.59)。在过去20年中,SCC的平均年度估计育种值增加了(49.02细胞/ ml /年,SE = 26.81细胞/ ml /年; p = 0.08),而对于MY(0.37 kg /年,SE = 0.87 kg / yr; p = 0.68)。 SCC和MY的父亲平均育种值高于母牛和水坝的育种值(p <0.01)。 lnSCC和MY的遗传力估计值及其低但正的遗传相关性表明,与其他奶牛种群一样,在该种群中选择低SCC可能是可行的。因此,在泰国乳制品改良计划中应鼓励选择较高的MY和较低的SCC,以通过改善母牛的健康状况和产奶量来提高盈利能力。

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