Genetic and phenotypic parameter estimates for reproduction traits in the Boer dam.
Genetic and phenotypic parameter estimates for reproduction traits in the Boer dam.
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DOI：
10.1016/j.livsci.2009.03.002
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发表时间：
2009-10
影响因子：
1.8
通讯作者：
Chun-yan Zhang;Shi-lin Chen;Xiang Li;Deqing Xu;Ying Zhang;Li-guo Yang
中科院分区：
文献类型：
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作者：
Chun-yan Zhang;Shi-lin Chen;Xiang Li;Deqing Xu;Ying Zhang;Li-guo Yang
通过使用拟合波尔水坝双性状动物模型 (y=Xb+Zaa+ZPP+e) 的 MTGSAM 程序估计繁殖性状的方差成分以及进一步的表型和遗传参数，包括出生窝数 (LSB) 和断奶时 (LSW)、妊娠期 (GP) 和出生窝重 (LWB)。计算基于 2002 年至 2007 年中国宜都波尔山羊繁育站 435 只波尔山羊母羊的 1205 胎次。采用 PROC GLM (SAS8.1) 将影响因素如胎次和年龄、产仔年份和季节、出生窝数、仔猪性别以及一些显着的相互作用作为固定效应进行研究。结果表明，育龄、胎次、母龄对各繁殖性状均显着影响。玩耍季节仅影响GP和LWB的性状。出生时产仔数对 LWB 有显着影响。 LSB、LSW、LWB 和 GP 的平均值分别为 1.76±0.67、1.62±0.62、6.54±2.51 kg 和 151.7±4.43 天。上述性状的直接加性遗传力估计值分别为0.12±0.01、0.10±0.01、0.14±0.02和0.09±0.01。 LSB、LSW和LWB之间的相关性估计值均高于0.52，其中遗传相关性最高。 GP 与其他性状之间的遗传相关性估计为中等（0.33-0.48），低于永久环境相关性（0.60-0.72）。综上所述，与其他山羊品种相比，波尔山羊具有良好的多产性。母猪的妊娠期随着产仔数的增加没有显着差异，这与猪等多胎品种相似。然而，在波尔水坝中获得的所有这些繁殖性状的遗传力估计值均低于 0.14； LSB和LWB都是估计的4个繁殖性状中遗传力最高的性状。高度的遗传和永久环境相关性表明，这些性状主要归因于不同胎次的不同遗传效应或受到永久环境效应的影响。
Variance components and further phenotypic and genetic parameters for reproduction traits including litter size at birth (LSB) and at weaning (LSW), gestation period (GP) and litter weight at birth (LWB) were estimated by use of the MTGSAM procedure fitting two-trait animal model (y=Xb+Zaa+ZPP+e) in Boer dams. The calculations were based on 1205 parities of 435 Boer dams at Boer Goat Breeding Station in Yidu, China, during 2002–2007. Influencing factors such as parity and age of dam, kidding year and season, litter size at birth, sex of kids and some significant interactions were investigated as the fixed effects by PROC GLM (SAS8.1). The results showed that kidding year, parity and age of dam significantly influenced all the reproduction traits. Kidding season only affected the traits of GP and LWB. Litter size at birth had significant effect on LWB. The mean values of LSB, LSW, LWB and GP were 1.76±0.67, 1.62±0.62, 6.54±2.51 kg and 151.7±4.43 days. The estimates of direct additive heritability for above traits were 0.12±0.01, 0.10±0.01, 0.14±0.02 and 0.09±0.01, respectively. The estimates of all the correlations among LSB, LSW and LWB were higher than 0.52, and the genetic correlations were the highest among all the correlations. The estimates of genetic correlations between GP and other traits were medium (0.33–0.48) and lower than the permanent environmental correlations (0.60–0.72). In conclusion, compared with other goat breeds, the Boer goat has good characteristic in prolificacy. The gestation period is not significantly different in dams with increase of litter size, which is similar to the multiple birth species such as pig. However, the heritability estimates for all these reproduction traits obtained in the Boer dams are lower than 0.14; both LSB and LWB are traits with the highest heritability among 4 reproduction traits estimated. High genetic and permanent environmental correlations indicate that these traits were mainly attributable to different genetic effects or influenced by the permanent environmental effect for the different parity.