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Effect of Sexual Rest and Frequency of Ejaculation on Sperm Acrosomal Morphology¹

Department of Animal Sciences and Industry, Oklahoma State University, Stillwater 74074

ABSTRACT

Effects of sexual rest and frequency of ejaculation on the acrosome were investigated. In the first phase, two groups of three bulls each were used to determine the possible effect of sexual rest and collection frequency on acrosome morphology. All bulls had been ejaculated once weekly for several months. Aged acrosomes in Group 1 bulls, switched from once weekly ejaculation to two ejaculations, two days per week, with no sexual rest, decreased from 17.0 to 5.0%. Conversely, aged acrosomes in Group 2 bulls, sexually rested for 6 weeks, increased from a prerest 18% to a postrest 42.2%. Resumption of four-time weekly ejaculation reduced the incidence similar to Group 1 within 2 weeks.

In the second phase of the study, four of the bulls were given 4 weeks sexual rest and then assigned to groups ejaculated either once or four times weekly for 1 month. The groups then switched frequencies and were collected for 1 month. Four times weekly ejaculation consistently resulted in fewer aged or aging sperm cells and greatly increased the total yield of sperm cells with no morphological evidence of aging.