Genetic Parameters for Direct and Maternal Effects and Estimation of Breeding Values for Birth Weight in Brown Swiss Cattle

Authors : Muammer TİLKİ, Mustafa SAATCI, Mehmet ÇOLAK

Pages : 287-292

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Publication Date : 0000-00-00

Article Type : Research Paper

Abstract :Variance components, genetic parameters, and breeding values for birth weight in Brown Swiss cattle reared in Bahri Dağdaş International Agricultural Research Institute were estimated by REML-BLUP procedures using MTDFREML computer programme. Six different animal models were fitted for the trait ranging from a simple to the most comprehensive model. The most detailed model insert ignore into journalissuearticles values(model 6); provided the best fit to the used dataset. Heritability was higher in the model without maternal effect. Although maternal effect had a significant place for the data, environmental effect due to dam was not important. Heritability insert ignore into journalissuearticles values(h2);, maternal heritability insert ignore into journalissuearticles values(m2);, and the genetic correlation between these 2 parameters insert ignore into journalissuearticles values(rAM); were 0.15, 0.06 and 0.92, respectively, according best model insert ignore into journalissuearticles values(model 6);. Breeding values were also calculated for the trait, but no positive or negative change has been observed between years. More detailed accurate data are needed to establish the applied method on the livestock sector in Turkey.
Keywords : Brown Swiss, birth weight, genetic parameters, breeding values, maternal effect