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Estimation of genetic parameters for body weight and egg production traits in Mazandaran native chicken

机译：Mazandaran土鸡体重和产蛋性状遗传参数的估计

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Native chicken breeding station of Mazandaran was established in 1988 with two main objectives: genetic improvement through selection programs and dissemination of indigenous Mazandarani birds. (Co)variance components and genetic parameters for economically important traits were estimated using (bi) univariate animal models with ASREML procedure in Mazandarani native chicken. The data were from 18 generations of selection (1988–2009). Heritability estimates for body weight at different ages [at hatch (bw1), 8 (bw8), 12 (bw12) weeks of ages and sex maturation (wsm)] ranged from 0.24 ± 0.00 to 0.47 ± 0.01. Heritability for reproductive traits including age at sex maturation (asm); egg number (en); weight of first egg (ew1); average egg weight at 28 (ew28), 30 (ew30), and 32 (ew32) weeks of age; their averages (av); average egg weight for the first 12 weeks of production (ew12); egg mass (em); and egg intensity (eint) varied from 0.16 ± 0.01 to 0.43 ± 0.01. Generally, the magnitudes of heritability for the investigated traits were moderate. However, egg production traits showed smaller heritability compared with growth traits. Genetic correlations among egg weight at different ages were mostly higher than 0.8. On the one hand, body weight at different ages showed positive and relatively moderate genetic correlations with egg weight traits (ew1, ew28, ew30, ew32, ew12, and av) and varied from 0.30 ± 0.03 to 0.59 ± 0.02. On the other hand, low negative genetic correlations were obtained between body weight traits (bw1, bw8, bw12, and wsm) and egg number (en). Also, there is low negative genetic correlation (?24 ± 0.04 to ?29 ± 0.05) between egg number and egg weight. Therefore, during simultaneous selection process for both growth and egg production traits, probable reduction in egg production due to low reduction in egg number may be compensated by increases in egg weight.
机译：Mazandaran的本地鸡育种站成立于1988年，其主要目标有两个：通过选择计划进行遗传改良，以及传播本地的Mazandarani鸟类。使用（双向）单变量动物模型通过ASREML程序对Mazandarani本地鸡的（重要）性状的（协）方差成分和遗传参数进行了估计。数据来自18代选择（1988-2009）。不同年龄[在孵化（bw1），8（bw8），12（bw12）周和性别成熟（wsm）的年龄）的遗传力估计值介于0.24±0.00至0.47±0.01之间。生殖性状的遗传力，包括性成熟时的年龄（asm）；卵数（en）;第一个鸡蛋的重量（ew1）； 28（ew28），30（ew30）和32（ew32）周龄的平均蛋重；他们的平均值（av）;生产的前12周的平均蛋重（ew12）；鸡蛋质量（em）；卵强度（eint）从0.16±0.01到0.43±0.01。通常，所研究性状的遗传力大小适中。然而，与生长性状相比，产蛋性状显示出较小的遗传力。不同年龄蛋重之间的遗传相关性大多高于0.8。一方面，不同年龄的体重与蛋重性状（ew1，ew28，ew30，ew32，ew32，ew12和av）表现出正相关和相对中等的遗传相关性，且变化范围为0.30±0.03至0.59±0.02。另一方面，体重性状（bw1，bw8，bw12和wsm）与卵数（en）之间获得了较低的负遗传相关性。而且，卵数与卵重之间的负遗传相关性较低（？24±0.04至？29±0.05）。因此，在同时选择生长和产卵性状的过程中，由于蛋数减少少而导致的产蛋量减少可能通过增加蛋重来补偿。

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