家养绵羊繁殖
限制最大似然
遗传力
垃圾箱
断奶
遗传相关
动物科学
生物
出生体重
加性遗传效应
母体效应
特质
生产力
最大似然
遗传变异
统计
后代
数学
遗传学
生态学
怀孕
基因
宏观经济学
经济
程序设计语言
计算机科学
作者
Parth Gaur,Z. S. Malik,Yogesh C. Bangar,Ankit Magotra,Abhay Singh Yadav
出处
期刊:Zygote
[Cambridge University Press]
日期:2021-12-09
卷期号:30 (3): 386-390
被引量:2
标识
DOI:10.1017/s0967199421000897
摘要
The objective of the current study was to estimate the genetic parameters for ewe productivity traits of Harnali sheep by examining non-genetic effects. The data records of 440 animals born to 85 sires and 259 dams were collected with respect to various traits such as litter size at birth (LSB), litter weight at birth (LWB), litter size at weaning (LSW), litter weight at weaning (LWW) and age at first lambing (AFL) for the period of 2001 to 2020. Genetic parameters were estimated by fitting a series of animal models using an average information restricted maximum likelihood (REML) algorithm in WOMBAT software. Least-squares analysis revealed significant (P < 0.05) influences of period of lambing, age and weight of ewe at lambing on the studied traits. These results indicated that heavier ewes had significantly higher (P < 0.05) values of litter weight traits than their counterparts. On the basis of likelihood ratio test, the estimates of direct heritability under best model for AFL, LSB, LWB, LSW and LWW were 0.06, 0.18, 0.09, 0.07 and 0.16, respectively. Maternal permanent environment effect made a significant contribution to the LSB trait (0.20). The genetic correlation between litter size and LWW was negative, while the remaining correlations were positive. The present results suggest that selection based on ewe productivity traits will result in low genetic progress and therefore the management role is more important for better gains.
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