J. Anim Sci.
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J. Anim Sci. 1975. 41:1686-1692.
© 1975 American Society of Animal Science
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Control of Estrus in Lactating Beef Cows with Prostaglandin F2{alpha} and Estradiol Benzoate1

J. A. Welch1, A. J. Hackett2, C. J. Cunningham1, J. O. Heishman1, S. P. Ford1,3,, R. Nadaraja4, W. Hansel4 and E. K. Inskeep1

West Virginia University, Morgantown 26506, Rutgers University, New Brunswick 08903, and Cornell University, Ithaca 14850

Abstract

The effects of prostaglandin F2{alpha} (PGF2{alpha}) and of estradiol benzoate (E2B) on estrus and conception and on plasma LH, progesterone and estrogen concentrations were studied in 67 lactating beef cows. Prostaglandin F2{alpha} was infused into the uterus of lactating beef cows in two trials (1 mg in trial 1 and 2 mg in trial 2). Approximately half of the PGF2{alpha}-treated cows received 400 µg E2B intramuscularly 48 hr after the PGF2{alpha} a treatment.

The percentage of cows in estrus by 88 hr post-treatment and the average interval to estrus, respectively, by trials and treatments were: Trial 1, PGF2{alpha} alone, 47% and 65 ± 2 hr; PGF2{alpha} + E2B, 69% and 64 ± 1 hr; Trial 2, PGF2{alpha} alone, 87% and 65 ± 4 hr; PGF2{alpha} + E2B, 85% and 65 ± 1 hr. Over both trials the percentages pregnant of those bred by artificial insemination (AI) were: PGF2{alpha} alone, 61%; PGF2{alpha} + E2B, 73%, Sham-infused controls, 56% and untreated controls, 71%.

Footnotes

1 Published with approval of the Director of the West Virginia Agricultural Experiment Station as paper number 1361. Supported by Hatch and Hatch Regional Funds (NE-72). Authors with this superscript are or were associated with this station. Dr. R. L. Butcher graciously provided assistance with and facilities for assays of progesterone.

2 Rutgers University, present address: Animal Research Institute, Agriculture Canada, Ottawa, Ontario Canada K1A 0C6.

3 Present address: Department of Animal Science, Oregon State University, Corvallis 97331.

4 Cornell University.






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Copyright © 1975 by the American Society of Animal Science.