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首页> 外文期刊>Tropical Animal Health and Production >Quantifying the effect of inbreeding on average daily gain and Kleiber ratio in Mazandaran native chickens
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Quantifying the effect of inbreeding on average daily gain and Kleiber ratio in Mazandaran native chickens

机译：近距离繁殖的近距离繁殖的效果和Mazananan本土鸡的平均日益增长和Kleiber比例

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The aims of this study was to evaluate inbreeding effects for growth rate (average daily gain from hatch to 8 weeks of age (ADG1-8), average daily gain from hatch to 12 weeks of age (ADG1-12), average daily gain from 8 weeks of age to 12 weeks (ADG8-12), average daily gain from hatch to sex maturity (ADG1-SM), average daily gain from 8 weeks of age to sex maturity (ADG8-SM), average daily gain from 12 weeks to sex maturity (ADG12-SM), and Kleiber ratios (KR1-8, KR1-12, KR8-12) in Mazandaran native chickens. The data set of 82,446 pedigreed individuals over 21 generations was analyzed. All individuals were grouped into three classes based on the inbreeding coefficient: First class contained non-inbred birds (F = 0) and second and third classes contained inbred individuals (0 < F <= 5% andF > 5%, respectively). The effects of inbreeding coefficient on the studied traits were estimated by the restricted maximum likelihood method (REML) applying the WOMBAT software and fitting individual increase in inbreeding coefficient (Delta Fi) of birds as linear covariates under 6 different animal models. ADG8-SM and ADG12-SM increased non-significantly by 0.003 and 0.005 g, respectively, due to 1% increase in Delta Fi, while ADG1-8, ADG1-12, ADG8-12, ADG1-SM, KR1-8, and KR1-12 decreased (P < 0.001), respectively, by 0.012 g, 0.011 g, 0.010 g, 0.014 g, 0.003 g, and 0.002 g. Also, KR8-12 non-significantly decreased by 0.001 g. Estimates of direct heritability of traits based on the most appropriate models ranged from 0.05 (KR8-12) to 0.26 (ADG12-SM). Results showed that it is important to regularly analyze inbreeding level in the herd in an attempt to prevent the reduction of performance.
机译：本研究的目的是评估增长率的繁殖效应（孵化到8周龄的平均每日增益（ADG1-8），孵化为12周龄（ADG1-12），平均每日收益8周龄至12周（ADG8-12），平均每日收益来自孵化到性成熟（ADG1-SM），每日8周龄的日期增长到性成熟（ADG8-SM），平均每日增益12周在Mazandaran Native Chickens进行性成熟（ADG12-SM）和Kleiber比率（KR1-8，KR1-12，KR8-12）。分析了超过21代以上的82,446名侏儒个人的数据集。所有人都分为三个课程基于近亲繁殖系数：第一类包含的非近交鸟（F = 0）和第二和第三类含有近交单（0 5％）。近亲繁殖系数对研究的影响通过应用袋熊软件和适合个人的受限制的最大似然方法（REML）估算特征。在6种不同的动物模型下的线性协变量中近冻结系数（三角形）。由于三角翼的增加，ADG8-SM和ADG12-SM分别增加了0.003和0.005g，而ADG1-8，ADG1-12，ADG8-12，ADG1-SM，KR1-8和KR1-12分别降低（P <0.001），分别为0.012g，0.011g，0.010g，0.014g，0.003g和0.002g。此外，KR8-12非显着降低0.001g。基于最合适的模型的性状直接可遗传性的估计范围为0.05（KR8-12）至0.26（ADG12-SM）。结果表明，在畜群中定期分析近亲繁殖水平是重要的，以防止减少性能。

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