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Influence of Season of the Year upon Patterns of Sexual Behavior in Male Sheep¹

University of California, Davis⁴

Abstract

Eight rams were individually exposed to an estrous ewe for 1 hr. twice monthly from January 1963 to January 1964. Number of ejaculations, mounts per ejaculation, teases per ejaculation and time from first tease to mounting were averaged over monthly and 3-month periods.

The average number of ejaculations varied significantly (P<.01) with month and season. The greatest number of ejaculations occurred in November and during the fall 3-month period.

Monthly averages for mounts per ejaculation did not differ significantly but seasonal averages did. The greatest number occurred during the winter 3-month period, and the least occurred in the summer. There was a significant correlation (–.72) between monthly averages of ejaculations and mounts per ejaculation.

Teases per ejaculation and time from first tease to mounting did not vary significantly with month or season.

¹ This study supported in part by funds from U.S.P.H.S. Grant No. B3977:

² NIH predoctoral training grant No. 26–646.

³ Present address: School of Aerospace Medicine, Brooks AFB, San Antonio, Texas.

⁴ Department of Animal Husbandry.