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首页> 外文期刊>Turkish Journal of Veterinary and Animal Sciences >Estimates of genetic parameters for different body weights andmuscle and fat depths of Karayaka lambs
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Estimates of genetic parameters for different body weights andmuscle and fat depths of Karayaka lambs

机译：卡拉亚卡羔羊不同体重，肌肉和脂肪深度的遗传参数估计

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In the current paper the direct additive and maternal genetic effects on birth, weaning (at 90 days of age), and scanning (at 20 weeks of age) weights and muscle and fat depths of the ribeye area in Karayaka lambs were investigated. Analyses were carried out by the restricted maximum likelihood approach, fitting 6 animal models with various combinations of direct and maternal effects. The best model was chosen after testing for improvement in the log-likelihood values. Direct heritability (h2d) for all traits decreased when maternal genetic effects were included in the models. The maternal heritability (h2m) ranged from 0.15 to 0.22 for birth weight, from 0.04 to 0.14 for weaning weight, and from 0.08 to 0.16 for scanning weight. The effects of h2m on muscle depth and fat depth of the ribeye area were not considered due to their insignificance. The permanent environmental effect of the dam was significant for birth, weaning, and scanning weights. Moderate negative genetic correlations (ram) between the direct and maternal genetic effects were observed, which were significant for birth (-0.179 and -0.221), weaning (-0.310 and -0.415), and scanning (-0.116 and -0.141) weights. As a result, h2d and h2m can be used as selection criteria for birth, weaning, and scanning weights in Karayaka lambs.
机译：在本文中，研究了卡拉耶卡羔羊的出生，断奶（90天龄）和扫描（20周龄）体重，肌肉和脂肪深度的直接加性和母体遗传效应。通过限制最大似然法进行分析，使6种动物模型具有直接和母体效应的各种组合。在测试对数似然值的改进后，选择了最佳模型。当模型中包括母体遗传效应时，所有性状的直接遗传力（h 2 d ）降低。产妇遗传力（h 2 m ）的出生体重范围为0.15至0.22，断奶体重范围为0.04至0.14，扫描体重范围为0.08至0.16。由于h 2 m 对肋眼区域的肌肉深度和脂肪深度的影响微不足道，因此未考虑。大坝的永久性环境影响对于出生，断奶和体重扫描都很重要。观察到直接和母亲遗传效应之间的中等负遗传相关性（r am ），这对出生（-0.179和-0.221），断奶（-0.310和-0.415）和扫描（ -0.116和-0.141）权重。结果，h 2 d 和h 2 m 可以用作出生，断奶，和扫描Karayaka羔羊的体重。

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