Genetic parameters of egg defects and egg quality in layer chickens
Genetic parameters of egg defects and egg quality in layer chickens
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DOI：
10.3382/ps.2011-02130
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发表时间：
2012-06-01
期刊：
影响因子：
4.4
通讯作者：
Dekkers, J. C. M.
中科院分区：
文献类型：
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作者：
Wolc, A.;Arango, J.;Dekkers, J. C. M.
估计了蛋缺陷、产蛋量和蛋品质性状的遗传参数。将11，738只纯种棕色产蛋鸡的蛋分类为可销售的或具有以下缺陷之一的蛋：带血、破碎、钙存款、脏、双蛋黄、畸形、小蛋、无壳和软壳。蛋品质包括蛋白高度、蛋重、蛋黄重和穿刺评分。还记录了体重、性成熟年龄和产蛋量。使用阈值动物模型的缺陷倾向的遗传力估计值小于0.1的血腥和肮脏的; 0.1和0.2之间的pee-wee，破碎，畸形;软壳，壳少;和0.2以上的钙存款和双蛋黄。品质和产量性状更容易遗传，估计值从0.29（穿刺评分）到0.74（蛋重）不等。高产母鸡的鸡蛋缺陷率较低。高蛋重和BW与双黄的频率增加，并在较小程度上，与更多的壳质量缺陷。与壳质量相关的缺陷性状之间的遗传相关估计值为正，且为中等至强（0.24-0.73），这表明这些性状可以归为一类，或者选择可以基于遗传力最高或最容易测量的性状。将蛋缺陷性状与商品蛋产蛋率和蛋品质性状一起沿着列入选择标准，可提高对缺陷蛋的选择效率。
Genetic parameters were estimated for egg defects, egg production, and egg quality traits. Eggs from 11,738 purebred brown-egg laying hens were classified as salable or as having one of the following defects: bloody, broken, calcium deposit, dirty, double yolk, misshapen, pee-wee, shell-less, and soft shelled. Egg quality included albumen height, egg weight, yolk weight, and puncture score. Body weight, age at sexual maturity, and egg production were also recorded. Heritability estimates of liability to defects using a threshold animal model were less than 0.1 for bloody and dirty; between 0.1 and 0.2 for pee-wee, broken, misshapen; soft shelled, and shell-less; and above 0.2 for calcium deposit and double yolk. Quality and production traits were more heritable, with estimates ranging from 0.29 (puncture score) to 0.74 (egg weight). High-producing hens had a lower frequency of egg defects. High egg weight and BW were associated with an increased frequency of double yolks, and to a lesser extent, with more shell quality defects. Estimates of genetic correlations among defect traits that were related to shell quality were positive and moderate to strong (0.24-0.73), suggesting that these could be grouped into one category or selection could be based on the trait with the highest heritability or that is easiest to measure. Selection against defective eggs would be more efficient by including egg defect traits in the selection criterion, along with egg production rate of salable eggs and egg quality traits.