Control of Estrus in Lactating Beef Cows with Prostaglandin F2α and Estradiol Benzoate1
- 1 December 1975
- journal article
- Published by Oxford University Press (OUP) in Journal of Animal Science
- Vol. 41 (6) , 1686-1692
- https://doi.org/10.2527/jas1975.4161686x
Abstract
The effects of prostaglandin F2α (PGF2α) 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 F2α 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 PGF2α-treated cows received 400 µg E2B intramuscularly 48 hr after the PGF2α 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, PGF2α alone, 47% and 65 ± 2 hr; PGF2α + E2B, 69% and 64 ± 1 hr; Trial 2, PGF2α alone, 87% and 65 ± 4 hr; PGF2α + E2B, 85% and 65 ± 1 hr. Over both trials the percentages pregnant of those bred by artificial insemination (AI) were: PGF2α alone, 61%; PGF2α + E2B, 73%, Sham-infused controls, 56% and untreated controls, 71%. Copyright © 1975. American Society of Animal Science . Copyright 1975 by American Society of Animal Science.Keywords
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