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首页> 美国卫生研究院文献>Springer Open Choice >Genetic and phenotypic parameter estimates for body weights and egg production in Horro chicken of Ethiopia
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Genetic and phenotypic parameter estimates for body weights and egg production in Horro chicken of Ethiopia

机译：埃塞俄比亚Horro鸡体重和产蛋量的遗传和表型参数估计

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摘要

A breeding program has been established in 2008 to improve productivity of Horro chicken, an indigenous population in the western highlands of Ethiopia. The pedigree descended from 26 sires and 260 dams. Body weights were measured every 2 weeks from hatch to 8 weeks then every 4 weeks for the next 8 weeks. Egg production was recorded to 44 weeks of age for one generation. Genetic parameters were estimated using animal model fitted with common environmental effects for growth traits and ignoring common environment for egg production traits. Direct heritabilities ranged from low (0.15 ± 0.08), for body weight at 6 weeks, to moderate (0.40 ± 0.23), for hatch weight. Heritabilities of common environmental effects on growth were high at hatch (0.39 ± 0.10) and remained low afterwards. Age at first egg showed a very low heritability (0.06 ± 0.15). Heritabilities of egg numbers in the first, second, third, and fourth months of laying were 0.32 (±0.13), 0.20 (±0.16), 0.56 (±0.15), and 0.25 (±0.14), respectively. Heritabilities of cumulative of monthly records of egg numbers were from 0.24 ± 0.16 (for the first 2 months, EP12) to 0.35 ± 0.16 (over the 6 months, EP16). Body weight at 16 weeks of age (BW16) has a strong genetic correlation with the cumulative of monthly records: 0.92 (with EP12), 0.69 (with EP36), and 0.73 (with EP16). Besides their strong association, BW16 and EP16 showed higher heritability, relative to their respective trait categories. These two traits seemed to have common genes and utilizing them as selection traits would be expected to improve both egg production and growth performance of local chicken. However, the standard errors of estimates in this study were mostly high indicating that the estimates have low precision. Parameter estimations based on more data are needed before applying the current results in breeding programs.
机译：2008年制定了育种计划，以提高Horro鸡的生产率，Horro鸡是埃塞俄比亚西部高地的土著居民。血统是由26头公马和260个水坝传承而来的。从孵化到8周每隔2周测量一次体重，然后在接下来的8周中每4周测量一次体重。产蛋记录到44周龄为一代。遗传参数是使用适合生长特征的常见环境效应而忽略了产卵特征的常见环境的动物模型估算的。对于6周龄的体重，直接遗传力范围从低（0.15±0.08）到孵化体重的中度（0.40±±0.23）。孵化时常见环境影响的遗传力较高（0.39±0.10），此后仍较低。第一个卵的年龄显示出极低的遗传力（0.06±0.15）。产蛋的第一，第二，第三和第四个月的卵数遗传力分别为0.32（±0.13），0.20（±0.16），0.56（±0.15）和0.25（±0.14）。卵数月度记录累积的遗传力从0.24±0.16（对于前两个月，EP12）到0.35±0.16（在6个月中，EP16）。 16周龄（BW16）的体重与每月记录的累积有很强的遗传相关性：0.92（使用EP12），0.69（使用EP36）​​和0.73（使用EP16）。除了它们的强关联性之外，相对于它们各自的性状类别，BW16和EP16还显示出更高的遗传力。这两个性状似乎具有共同的基因，利用它们作为选择性状有望改善鸡蛋的产量和当地鸡的生长性能。但是，这项研究中估计的标准误大部分很高，这表明估计的精度较低。在将当前结果应用于育种程序之前，需要基于更多数据的参数估计。

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