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Journal of Dairy Science Vol. 66 No. 8 1721-1727
© 1983 by American Dairy Science Association ®
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Use of Prostaglandin F2{alpha} or Gonadotropin Releasing Hormone in Treating Problem Breeding Cows1

R. A. Dailey, E. K. Inskeep, S. P. Washburn and J. C. Price2

Division of Animal and Veterinary Sciences, West Virginia University, Morgantown 26506

ABSTRACT

Ten veterinarians diagnosed and treated 296 cows for reproductive irregularities on 28 dairy farms. Average interval from treatment with 25 mg of prostaglandin F2{alpha} (137 cows) to estrus for cows with a corpus luteum (14.6 days) was reduced compared to saline (52 cows) (21.8 days), and a greater percentage (41.6 versus 17.3%) showed estrus within 6 days of treatment. Cows with a cystic corpus luteum (28) were detected in estrus at comparable intervals after prostaglandin F2{alpha} or saline (21.8 versus 21.2 days), and similar proportions of cows were detected in estrus within 6 days of treatment (16.7 versus 10.0%). Intervals to estrus among cows with cystic follicles (40 cows) or anestrous cows with follicular ovaries (39 cows) did not differ after treatment with saline or 100 or 200 µg of gonadotropin releasing hormone. Within 25 days after treatment, 47.5% of cows with cystic ovaries and 64.1% of anestrous cows showed estrus. Number of cows pregnant after as many as three artificial inseminations of the number examined was 46%, whereas average number of conceptions per service was .32. The long interval from parturition to examination (112 days), the low rate of estrous response after treatment, and the long interval (1.6 estrous cycles) between estruses are consonant with inadequate estrous detection.

FOOTNOTES

1 Published with the approval of the Director of the West Virginia Agricultural and Forestry Experiment Station as Scientific Paper No. 1782. Supported by Hatch Project 224 (NE72) and Sire Power, Inc.

2 Dairy Practitioner, Herd Health and Reproduction, Shepherdstown, WV 25443.






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Copyright © 1983 by the American Dairy Science Association ®.