The Progeny test of Friesian sires for milk traits by using the contemporary comparison method

Revista Colombiana de Ciencia Animal Recia Pub Date : 2021-03-11 DOI:10.24188/RECIA.V13.N1.2021.747

O. Mardenli

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引用次数: 2

Abstract

In this study, the contemporary comparison method (CC) of half-sibs relation was used to estimate the breeding values of Holstein-Friesian sires for 305 -day milk yield (305-DMY) and basic components of milk traits, 409 records of cows that are daughters of ten sires in eight Syrian dairy farms where used. Result of the study showed differences in the estimated breeding values(ccEBVs), where the E Sire achieved the highest value of 305-DMY trait (254.47 kg), while the B Sire achieved the highest value of milk protein percentage (MPP), milk fat percentage (MFP)and milk lactose percentage (MLP) traits (0.822 %, 0.857 %and 1.09% respectively). According to their sires, daughters of E Sire outperformed the counterparts in the 305-DMY (p = 0.001), MPP (p = 0.001) and MFP (p = 0.04) traits (5701.44 kg, 3.55%, and 3.88% respectively). According to source of farm, daughters in Farm 5 achieved the highest value of 305-DMY trait (p=0.04) and daughters in the seventh farm achieved the highest value of MPP trait (p=0.007), the values were 5403.48 kg and 3.54 % respectively. Values of heritability (h2) for the traits of 305-DMY, MPP, MFP and MLP were 0.33,0.54,0.43 and 0.47 respectively. Most of genetic and phenotypic correlations coefficients were approaching to zero except the genetic relation between MLP and MPP and phenotypic relation between MFP and MPP (0.88 and 0.84 respectively).

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用当代比较方法对弗里西亚母猪的乳性状进行后代检验

在本研究中，使用半同胞关系的当代比较方法（CC）来估计荷斯坦-弗里斯父系305天产奶量（305-DMY）和乳汁性状的基本成分的育种值，409份记录是叙利亚八个奶牛场10个父系的女儿。研究结果显示，估计育种值（ccEBV）存在差异，其中E Sire获得了305-DMY性状的最高值（254.47 kg），而B Sire获得的乳蛋白百分比（MPP）、乳脂肪百分比（MFP）和乳乳糖百分比（MLP）性状的最高价值（分别为0.822%、0.857%和1.09%）。根据他们的父系，E Sire的女儿在305-DMY（p=0.001）、MPP（p=0.001）和MFP（p=0.04）性状上的表现优于对手（分别为5701.44公斤、3.55%和3.88%）。从农场来源来看，第5个农场的女儿获得了305-DMY性状的最高值（p=0.04），第7个农场的女孩获得了MPP性状的最高价值（p=0.007），分别为5403.48kg和3.54%。305-DMY、MPP、MFP和MLP性状的遗传力（h2）分别为0.33、0.54、0.43和0.47。除MLP与MPP的遗传关系和MFP与MPP之间的表型关系（分别为0.88和0.84）外，大多数遗传和表型相关系数均接近零。

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Revista Colombiana de Ciencia Animal Recia

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32 weeks