Delayed Breeding Optimizes Conception in Dairy Cows with Prolonged Estrus

Authors

  • A. Villarroel College of Veterinary Medicine, Oregon State University, Corvallis, OR 97331
  • V. M. Lane Department of Population Health and Reproduction, School of Veterinary Medicine, UC Davis, CA 95616

DOI:

https://doi.org/10.21423/aabppro20104179

Keywords:

estrus, insemination, ovulation, conception risk, prolonged estrus

Abstract

A common question of dairy farmers is whether to breed a cow that is still in estrus several hours after insemination. It is possible these cows have a longer interval between onset of estrus and ovulation time, and thus AM-PM rule is not valid. The objective of this study was to compare conception risk in cows with prolonged estrus bred once vs. twice (12 hours apart).

Cover image of the 43rd Conference Proceedings: Two short-horned cattle grazing in a field, surrounded by a flock of egrets. Yellow background.

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Published

2010-08-19

Issue

2010

Section

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