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Journal of Dairy Science Vol. 26 No. 11 983-985
© 1943 by American Dairy Science Association ®
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The Relation of Longevity to Fertility of Bull Semen*

S. Margolin, J. W. Bartlett and O. L. Lepard

New Jersey Agricultural Experiment Station, New Brunswick, N. J.

ABSTRACT

  1. The analysis of the breeding records kept on ten sires and 306 cows show a highly significant correlation between the longevity and the conception rate of bull semen (+ 0.6964 ± 0.0212).
  2. Six of eight sires studied showed significant positive correlations between longevity and conception rate; two showed insignificant negative correlations.
  3. There was only a slight difference in percentage of conception for fresh semen and one-day semen (63.7 per cent and 61.9 per cent, respectively).

FOOTNOTES

* Journal Series paper of the New Jersey Agricultural Experiment Station. Rutgers University, department of dairy husbandry.






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Copyright © 1943 by the American Dairy Science Association ®.