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FURTHER STUDIES ON THE NUCLEAR CHROMATIN OF MORPHOLOGICALLY ABNORMAL BULL SPERMATOZOA

In ejaculated semen from highly fertile bulls, abnormal head forms constitute 5 to 20% of the total number of sperm heads, while even higher percentages are commonly found in ejaculates from bulls with certain types of reduced fertility. Intranuclear spaces and a granular appearance of the nuclear chromatin were the major abnormalities observed in a high percentage of spermatozoa from two infertile bulls (McCosker, 1969).

The organization of the DNA and nuclear proteins forming the deoxyribonucleoprotein complex (DNP) in the chromatin of deformed sperm heads has received little attention. Previous studies have demonstrated that most morphologically abnormal sperm heads contain the same amounts of DNA as their normally shaped counterparts (Gledhill, 1966a). Defects in the binding of nuclear protein to DNA, which probably occur

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				D. Evenson, Z Darzynkiewicz, and M. Melamed Relation of mammalian sperm chromatin heterogeneity to fertility Science, December 5, 1980; 210(4474): 1131 - 1133. [Abstract] [PDF]