POLYMEGALY IN SPERMATOZOAL ATTRIBUTES AND ITS GENETIC DETERMINATION IN CATTLE

摘要

Frequency distribution graphi of apermatozoal head length, head width, midpieec length and tail length of Jersey, JXT, JXGXT, JXR, HFXGir and Gaolao bulls showed polymegaly for various traits (midpiece length in Gaolao breed showed dimegaly). The morphology of gametes is determined by diploid genotype of the males which produce the gametes and the haploid genotype of a gamete also. Sidhu (1963) described polymorphism in Drosophila spermatozoa. Spermatophoral size varied widely in more than half a dozen species. Beatty and sidhu (1969) reported polymegaly of the spermatozoan length, usually trimcgaly, in five species of the obscura group of Drosophila. In mammalian sperm also, there are reports of polymorphism e.g. Batabyal and Sidhu (1979) in boar,Sidhu et al. (1987) in arthropods and mammals.