A total of 30 animals, belonging to three breeds and crossbreds (Friesian, Local x Friesian and Shahiwal x Friesian) were analyzed to study the magnitude of phenotypic variation and the repeatability of semen characteristics for volume of ejaculate, mass movement, forward movement and concentrations of semen. The co-efficient of variations ranges from 13.10 to 46.20% for various semen characteristics. Least square analysis of variance showed that breeds had significant effect on volume of ejaculate (P<0.05), mass movement (P<0.01), forward movement (P<0.05) and concentration (P<0.05) of semen. Pooled repeatability of volume of ejaculate, mass movement, forward movement and concentration ranges from 0.30 to 0.44, which indicated that more number of measurements should be considered for gain in accuracy in selecting the bulls. In semen out put, it was concluded that repeatabilities of semen characteristics was moderate. The breeds and crossbreds were found suitable for semen production. The crossbreds are as good as the purebreds for semen quality and output. Among the breed and crossbreds, Local x Friesian was found to be the most suitable. There was large phenotypic variation in semen characteristics in both between and within the breeds.
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M.N. Haque, A. B.M. M. Islam, A.K.F.H. Bhuiyan, S. A. Aziz and M.G. Kibria, 2001. Phenotypic Variation and Repeatability of Semen Characteristics of Bulls. Pakistan Journal of Biological Sciences, 4: 1418-1420.