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Seasonal Variation in Semen Quality of Some Missouri Dairy Bulls^*

Department of Dairy Husbandry, University of Missouri, Columbia, Missouri

ABSTRACT

A study of the monthly variation of the initial motility, volume, concentration, useful storage time, pH, and morphology of the semen of thirteen dairy bulls used in the University of Missouri herd during three years has been presented. The monthly variations in volume, concentration, and percentage of total abnormal spermatozoa were not statistically significant. The pH of the semen was significantly lower in the summer than in the fall. Initial motility and useful viability were lower in winter than in spring and summer. The results were interpreted as being largely due to the adverse effect of winter weather upon the physical well being and sexual activity of the aged bulls which furnished the majority of the semen studied.

^* A contribution from the Department Of Dairy Husbandry, Missouri Agricultural Experiment Station Journal Series No. 916.