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首页> 外文期刊>Tropical Animal Health and Production >Autosomal and sex-linked (co)variance components and genetic parameters for growth traits of Iranian Zandi sheep
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Autosomal and sex-linked (co)variance components and genetic parameters for growth traits of Iranian Zandi sheep

机译：伊朗Zandi绵羊生长性状的常血糖和性别联系（CO）方差分量和遗传参数

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摘要

Separation of autosomal and sex-linked direct additive genetic effects has significant role in sheep breeding programs. Hence, this study was conducted to determine the genetic parameters of autosomal and sex-linked effects for growth traits of Zandi sheep. The data set used in this study contained 7571 Zandi lambs, descendent of 220 sires and 1481 dams, which were collected from Zandi sheep breeding Station at Khojir, Tehran, Iran from 1992 to 2011. The fixed effects included of year (20 classes), season (winter and spring), sex (male or female), birth type (single or twin), and the age of dam (seven classes, 2-8 years old). The data were analyzed using REML methodology by WOMBAT software. In the most appropriate fitted model, based on Akaike's information criterion (AIC) and Bayesian information criterion (BIC), the values of direct autosomal heritabilities of birth weight (BW), kleiber ratio at weaning (KR), 6-month weight (6MW), and 9-month weight (9MW) were 0.12 +/- 0.03, 0.29 +/- 0.05, 0.14 +/- 0.04, and 0.15 +/- 0.04, respectively. Furthermore, weaning weight (WW), average daily gain from birth to weaning (ADG), and 12-month weight (12 MW) showed the values of 0.19 +/- 0.03 and 0.22 +/- 0.03, 0.13 +/- 0.05 and 0.15 +/- 0.03, and 0.15 +/- 0.05 and 0.18 +/- 0.05, respectively. Based on the best models through all traits, estimates of the direct sex-linked heritability ranged from 0.0 (WW, ADG, KR, and 6MW) to 0.02 +/- 0.03 (12MW). The average of autosomal and sex-linked breeding values (BVs) of body growth traits except KR (for autosomal) and 9MW and 12MW (for sex-linked) were greater than zero. The Pearson's/Spearman's correlation coefficients varied between 0.344 and 0.599/0.30 and 0.61 for autosomal and sex-linked BVs. Direct autosomal and sex-linked additive correlations for growth traits were ranged from - 0.02 (BW-KR) to 0.98 (WW-ADG) and 0.04 (KR-9 MW) to 0.99 (WW-ADG), respectively. Our results revealed that the genetic parameters related to growth traits in Zandi sheep could be more useful in selection strategies.
机译：分离常染色体和性别联系的直接添加剂遗传效应在绵羊繁殖计划中具有重要作用。因此，进行了该研究以确定粒子绵羊生长性状的常染色体和性关系的遗传参数。本研究中使用的数据集包含了7571年的Zandi羔羊，220个Sires和1481个坝，从1992年到2011年的Khojir，德黑兰的Zandi羊养殖站收集了Zandi羊养殖站。一年（20班）包括的固定效果，季节（冬季和春天），性别（男性或女性），出生型（单身或双胞胎），和大坝的时代（七级，2-8岁）。使用伯巴特软件的REML方法分析数据。在最合适的拟合模型中，基于Akaike的信息标准（AIC）和贝叶斯信息标准（BIC），直接常染色体遗传性的出生体重（BW），断奶术（KR），6个月重量（6MW） ）和9个月的重量（9MW）分别为0.12 +/- 0.03,0.29 +/- 0.05,0.14 +/- 0.04和0.15 +/- 0.04。此外，断奶重量（WW），出生的平均每日增益（ADG）和12个月的重量（12 MW）显示0.19 +/- 0.03和0.22 +/- 0.03，0.13 +/- 0.05和0.15 +/- 0.03和0.15 +/- 0.05和0.18 +/- 0.05分别。基于所有特征的最佳模型，对直接性关联的遗传性的估计范围从0.0（WW，ADG，KR和6MW）到0.02 +/- 0.03（12mW）。除Kr（用于常染色体）和9MW和12MW（性联系）之外的常染色体和性链接育种值（BVS）的平均值大于零。 Pearson's / Spearman的相关系数在0.344和0.599 / 0.30和0.61之间变化，适用于常染色体和性别联系的BVS。生长性状的直接常血糖和性联合添加剂的相关性分别为0.02（BW-KR）至0.98（WW-ADG）和0.04（KR-9MW）至0.99（WW-ADG）。我们的研究结果表明，Zandi绵羊生长性状有关的遗传参数在选择策略方面可能更有用。

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