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Journal of Dairy Science Vol. 25 No. 9 815-826
© 1942 by American Dairy Science Association ®
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Seasonal Variation in Semen Quality of the Dairy Bull1

R. E. Erb, F. N. Andrews and J. H. Hilton2

Purdue University Agricultural Experiment Station, Lafayette, Ind.

ABSTRACT

  1. Analyses of variance in various characteristics of semen production between bulls and between months reveal highly significant differences between bulls and between months for all factors studied except pH.
  2. The average semen volume was least in July, August and September.
  3. The average initial motility was least in July, August and September.
  4. The average concentration of spermatozoa and total sperm per ejaculate was maximum during April, May and June.
  5. The average period of sperm survival was least in August, and lower in July, September and November than during any other months.
  6. The average number of abnormal spermatozoa was 25 per cent greater during July, August and September than during the next highest month of the year.
  7. No significant seasonal variations in pH were observed.
  8. The quality of the semen produced by the bulls in this study was significantly superior during the spring and significantly inferior during the summer. The semen produced during the fall and winter months did not vary significantly from the mean.

FOOTNOTES

1 Journal paper No. 19, Purdue University Agricultural Experiment Station.

2 The authors wish to express their appreciation to Doctor M. R. Zelle of the Department of Animal Husbandry for his cooperation in the statistical treatment of the data and to Mr. George Hainje and his assistants at the Purdue Dairy Farm for their care of the experimental animals.






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Copyright © 1942 by the American Dairy Science Association ®.