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Estimation of Variance Components and Genetic Parameters for Direct and Maternal Effects on Birth Weight in Brown Swiss Cattle
 
Ali Kaygisiz*, Galip Bakir1, Isa Yilmaz2 and Yusuf Vanli3
Department of Animal Science, Faculty of Agriculture, Kahramanmaras Sutcu Imam University; 1Department of Animal Science, Faculty of Agriculture, Yuzuncu Yil University, Van; 2Department of Animal Science, Faculty of Agriculture, Igdir University; 3Department of Animal Science, Faculty of Agriculture, Namik Kemal University, Türkiye *Corresponding author: alikaygisiz@ksu.edu.tr

Abstract   

The purpose of this study was to estimate the variance components and genetic parameters for birth weight in Brown Swiss cattle reared at Malya and Konuklar State Farms, Türkiye. The least square means of birth weight were 39.91±0.005 and 42.26±0.09kg for the calves raised at Malya and Konuklar State Farms, respectively. The effects of calving year, parity and calf sex on birth weight were significant (P<0.05). The effect of calving season on birth weight was highly significant (P<0.01) for Malya State Farm, while it was non-significant for Konuklar State Farm. Direct heritability (h2d), maternal heritability (h2m), total heritability (h2T) and the fraction of variance due to maternal permanent environmental effects (c2) were 0.09, 0.04, 0.11 and 0.04, respectively for birth weights of the calves raised at Malya State Farms. The corresponding values of birth weight for calves raised at Konuklar State Farm were 0.39, 0.015, 0.29 and 0.018, respectively.

Key words: Birth weight; Brown Swiss calf; Heritability; Maternal effect; Repeatability; Variance component

 
 
   

ISSN 0253-8318 (Print)
ISSN 2074-7764 (Online)



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