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首页> 外文期刊>Spanish Journal of Agricultural Research >Genetic parameter estimates for birth and weaning weights, pre-weaning daily weight gain and three type traits for Charolais beef cattle in Spain
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Genetic parameter estimates for birth and weaning weights, pre-weaning daily weight gain and three type traits for Charolais beef cattle in Spain

机译：西班牙夏洛来肉牛的出生体重和断奶体重，断奶前每日体重增加和三种性状的遗传参数估计

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Genetic parameters were estimated using REML in a multiple-trait animal model including genetic direct and maternal effects for birth and weaning weights, pre-weaning daily weight gain and three linearly scored traits (muscularity, skeletal size and general appearance) in 3,428 Charolais calves. The three complex type traits were scored at weaning on a nine-point scale. Fixed effects considered were herd-year-season of birth, sex of the calf and parity number of the dam. The fixed effect of weaning season and the linear covariate of age at weaning were considered for all variables except for birth weight. All fixed effects contributed significantly (P < 0.001) to variations in all traits except for the effect of weaning season which was not significant for the general appearance score. The percentage of variance explained by the model averaged 50.74% for the considered traits. Average birth and weaning weights and pre-weaning daily weight gain were 42.95, 278.21 and 1.11 kg, respectively, while muscularity, skeletal size and general appearance scores averaged 5.33, 5.19 and 5.36, respectively. Direct heritability estimates were 0.36, 0.36, 0.22, 0.50, 0.52 and 0.52 for the six traits, respectively. The corresponding maternal heritabilities were 0.37, 0.32, 0.18, 0.18, 0.15 and 0.13, respectively. Direct genetic correlations among these traits varied from low and negative (?0.11) between birth and weaning weights to extremely high and positive (0.95) between muscularity and skeletal size scores. Type traits can be effectively used to improve the efficiency of beef production for Charolais calves in Spain.
机译：在多性状动物模型中使用REML估算了遗传参数，包括对3,428只夏洛来牛犊的遗传直接和母体影响出生和断奶体重，断奶前每日体重增加和三个线性评分的性状（肌肉，骨骼大小和总体外观）。在断奶时以九分制对三个复杂类型特征进行评分。考虑的固定效应是出生的畜群年季节，小牛的性别和水坝的平价。除出生体重外，所有变量均考虑了断奶季节的固定影响和断奶时年龄的线性协变量。所有的固定效应对所有性状的变异均具有显着的影响（P <0.001），但断奶季节的效应对总体外观得分并不显着。该模型所解释的性状的方差百分比平均为50.74％。平均出生体重和断奶体重分别为42.95、278.21和1.11 kg，而肌肉，骨骼大小和一般外观得分分别平均为5.33、5.19和5.36。这六个性状的直接遗传力估计分别为0.36、0.36、0.22、0.50、0.52和0.52。相应的母体遗传力分别为0.37、0.32、0.18、0.18、0.15和0.13。这些性状之间的直接遗传相关性从出生体重和断奶体重之间的低和负（？0.11）到肌肉和骨骼大小得分之间的极高和正（0.95）不等。类型性状可以有效地用于提高西班牙夏洛来牛犊的牛肉生产效率。

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