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Journal of Dairy Science Vol. 68 No. 2 387-390
© 1985 by American Dairy Science Association ®
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Induction of Acrosome Reactions by Chondroitin Sulfates In Vitro Corresponds to Nonreturn Rates of Dairy Bulls

R. L. Ax

Department of Dairy Science, University of Wisconsin, 1675 Observatory Drive, Madison 53706

K. Dickson and R. W. Lenz

Sire Power, Inc., Route 2, Tunkhannock, PA 18657

ABSTRACT

This study was designed to relate nonreturn rates to induction of acrosome reactions by the glycosaminoglycan chondroitin sulfate. Semen samples were obtained from four bulls above and four bulls below 65% nonreturn. Washed sperm from four ejaculates from each bull were incubated for 9 h with 0, 1, 10, or 50 µg/ml chondroitin sulfate. Acrosome reactions were evaluated by microscopy with Nomarski optics. Sperm from the higher fertility bulls exhibited significantly higher percentages of acrosome reactions to 10 and 50 µg/ml of chondroitin sulfate, and the slope of their dose-response regression line was significantly greater.






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Copyright © 1985 by the American Dairy Science Association ®.