Effect of Prostaglandin F Administered before Estrus Synchronization with Norgestomet and Estradiol Valerate on Calving Rates of Beef Cows

D. J. Kesler, D. B. Faulkner, R. Machado, F. A. Ireland, K. E. Tjardes

Research output: Contribution to journalArticle

2 Scopus citations


Three experiments were conducted to evaluate the effects of prostaglandin F treatments 5, 9, and 14 d before Syncro-Mate B® on calving rates of 1,072 beef cows from inseminations at a pre-set time. The administration of prostaglandin F 5 d before Syncro-Mate B decreased (P < .01) calving rates. This reduction was associated with lower (P < .05) calving rates in cows administered Syncro-Mate B in the first half of the estrous cycle. Calving rates were unaffected in cows administered prostaglandin F 9 d before Syncro-Mate B. The administration of prostaglandin F 14 d before Syncro-Mate B reduced (P < .05) calving rates in previously anestrous cows. In summary, prostaglandin F should not be administered to postpartum cows 5 to 14 d before Syncro-Mate B synchronization.

Original languageEnglish (US)
Pages (from-to)2076-2080
Number of pages5
JournalJournal of animal science
Issue number9
StatePublished - Sep 1996



  • Beef Cattle
  • Calving Rate
  • Estrus
  • Progesterone
  • Prostaglandins
  • Synchronization

ASJC Scopus subject areas

  • Food Science
  • Animal Science and Zoology
  • Genetics

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