Estimation of genetic parameters of reproductive traits in Zandi sheep using linear and threshold models.
作者： H. Mohammadi , M. Moradi Shahrbabk , M. Vatankhah
DOI: 10.17221/6274-CJAS
关键词:
摘要: Genetic parameters for reproductive traits in Zandi sheep were estimated from data records of 5025 lambs 178 sires and 1967 dams collected between the years 1993 2010 using ASReml sta- tistical package. four basic two composite traits. Year lambing age ewe used as fixed effects. Due to repeated record animal direct genetic effects permanent environmental considered random. The heritability estimates conception rate, number born, born alive, alive at weaning, per exposed, weaned exposed low with linear model - 0.05, 0.14, 0.12, 0.09, 0.04 respectively while resulting threshold analysis 0.11, 0.19, 0.16, respectively. Estimates heritabilities mainly due typical strong influence factors on repro- ductive repeatabilities medium by analysis, analysis. These may provide a basis deriving selection indexes
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