Abstract

This study was conducted to estimate genetic parameters of type traits and their relationships with reproductive traits in Iranian Holstein dairy cows. For this purpose, 16837 records provided by Shir VA Gousht Dairy Farm Company were used. The data was obtained in years 1990 to 2010 and analyzed by average information restricted maximum likelihood method (AIREML). Genetic relationships were estimated using multivariate analysis. Rear legs side view and udder cleft had the highest correlations with lower number of insemination (-0.16, -0.15, respectively) while the rear legs rear view and teat placement, had the highest correlations with lower dystocia (-0.71, -0.64, respectively). The genetic trends of type traits showed that teat lengths are becoming shorter and statures are becoming taller. Most of the genetic trends of the type traits were considered desirable. For reproductive traits the genetic trend was small but undesirable.

Mohammad Rabbani khourasgani, Saeid Ansari Mahyari, Mohammad Ali Edriss

Proceedings of the World Congress on Genetics Applied to Livestock Production, Volume Genetic Improvement Programs: Selection for harsh environments and management of animal genetic resources (Posters), , 413, 2014
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