Abstract
The performance of Holstein × Indigenous (H×I) crossbred dairy cattle in Iran was considered between 1991 and 2003. Milk, fat yield and fat percentage traits were considered in this research. Variance components were estimated using animal model (single trait) and derivative-free restricted maximum likelihood method for different traits. Crossbred animals with 50 to 70% of Holstein gene ratio have shown higher performance. The average performances for the mentioned traits were 2722.68, 122.97 and 3.97%, respectively. The estimation of the heritability for milk yield, fat yield, and fat percentage were 0.332, 0.3277 and 0.145. The research results showed that production potential has been increased by crossbreeding. Key word: Genetic parameter, crossbreeding, Holstein.
Highlights
The use of modern technology in developed countries at animal husbandry, nutrition genetics and improvement of farm animal with regards environmental and health conditions has caused the actual production of animals be close to their physiological and genetic potential (Rukui et al, 2000; Singh et al, 1986)
Fat yield and fat percentage traits were considered in this research
Crossbred animals with 50 to 70% of Holstein gene ratio have shown higher performance
Summary
Estimation of genetic parameter in Iranian Holstein crossbred dairy cattle Ghorbani A.1*, S. The performance of Holstein × Indigenous (H×I) crossbred dairy cattle in Iran was considered between 1991 and 2003. Fat yield and fat percentage traits were considered in this research. Variance components were estimated using animal model (single trait) and derivative-free restricted maximum likelihood method for different traits. Crossbred animals with 50 to 70% of Holstein gene ratio have shown higher performance. The average performances for the mentioned traits were 2722.68, 122.97 and 3.97%, respectively. The estimation of the heritability for milk yield, fat yield, and fat percentage were 0.332, 0.3277 and 0.145. The research results showed that production potential has been increased by crossbreeding.
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