Effect of Sexual Rest and Subsequent Regular Collection on Acrosome Characteristics of Bull Spermatozoa

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Abstract
This study was conducted to characterize the distribution of acrosomal characteristics among cell types in first ejaculates of bulls emerging from sexual rest and the changes occurring as a result of subsequent weekly collections for 6 consecutive weeks. Acrosomal abnormalities generally were associated to the greatest degree with tailless and abnormal spermatozoa and to the least degree with normal spermatozoa. First ejaculates following sexual rest are characterized by low semen quality, i.e., marginal motility, a high percentage of abnormals, and a high percentage of acrosomal abnormalities in all cell types. Subsequent weekly semen collection results in gradually rising levels of live cells and normal cells accompanied by rapidly rising percentages of normal cells with normal acrosomes. The evidence indicates that the integrity of the acrosome is highly subject to environmental and physiological changes and/or stresses. It would appear that acrosomal evaluation is a needed addition to existing methods of semen evaluation. Copyright © 1970. American Society of Animal Science. Copyright 1970 by American Society of Animal Science

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