Estimates of Genetic and Phenotypic Parameters for Birth Weight in Holstein Friesian Cattle
The purpose of this study was to estimate genetic and phenotypic parameters for
birth weight in Holstein calves raised at 4 different state farms. The least squares
mean of birth weight was 38.09±0.07 kg. Effects of birth year, birth type, parity,
farm (P<0.01) and season (P<0.05) on birth weight was significant; however,
the effect of sex on birth weight was not significant. Repeatability and heritability
estimates for birth weight were 0.34±0.02 (P<0.05) and 0.13±0.02 (P<0.01).
Based on these results it can be suggested that the effects of environmental factors
should be eliminated in the selection which will be mediated based on birth weight.
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