Effect of Month and Stallion on Seminal Characteristics and Sexual Behavior

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Abstract
Eight seminal and three behavioral characteristics were measured during and immediately following collection of first and second ejaculates of semen from each of five stallions over a 12-month period. The number of paired ejaculates per criterion ranged from 165 to 173. The parameters studied were: volume of gel-free semen, sperm concentration per milliliter, total sperm per ejaculate, motility in raw and diluted semen, degree of clumping, pH, freezing-point depression, number of mounts per ejaculate, reaction time and copulation time. A highly significant difference (P<.01) among months was found for all measurements on first ejaculates except sperm concentration per ml, pH, freezing-point depression of seminal plasma and copulation time. Sperm concentration per ml and freezing-point depression were significant at the 5% level of probability. Variation due to stallion was significant (P<.01) for all characteristics of first ejaculates except motility, freezing-point depression and copulation time, and freezing-point depression was different at the 5% level of probability. The trends were similar for second ejaculates, with respect to the influence of month and stallion (table 1). Differences (P<.01) between the means of first and second ejaculates were observed for all criteria except semen volume, motility, freezing-point depression and copulation time. Copyright © 1970. American Society of Animal Science. Copyright 1970 by American Society of Animal Science

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