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Comparison of Additive Genetic Parameter in Two Iranian Crossbred Population

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Author(s): A. Gorbani | R. Salamatdoust Nobar | U. Mehman Navaz | K. Nazer Adl | H. Agdam Shahriar | G.J. Gyasi

Journal: International Journal of Animal and Veterinary Advances
ISSN 2041-2894

Volume: 3;
Issue: 4;
Start page: 338;
Date: 2011;
Original page

Keywords: Brown Swiss | crossbreeding | genetic parameter | heterosis

ABSTRACT
The performance of crossbred cattle in Iran was considered across years 1991-2003. Crossbred animals were results of Holstein×Indigenous (H×I) and Brown Swiss×Indigenous (B×I) crossbreeding systems .These two population were considered separately. The research results showed that production potential has been increased by crossbreeding, and crossbred animals with 50-70% of Holstein or Brown Swiss blood ration have showed higher performance. Variance component were estimated using animal model (single trait) and Derivative-free restricted Maximum Likelihood method for different traits. The estimation of the heritability for milk yield, fat yield, and fat percentage and milk days were 0.332, 0.34, 0.23 and 0.26 respectively for single models in (H×I) population. In (B×I) population the estimation heritability were 0.2374, 0.1629, 0.17 and 0.338 respectively for milk yield, fat yield, fat percentage and milk days traits. The result showed that additive genetic variance share in Holstein crossbred higher than others.
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