Elsevier

Journal of Dairy Science

Volume 64, Issue 2, February 1981, Pages 267-271
Journal of Dairy Science

Research-Article
Estrus-Related Odors in Cows: Time of Occurrence

https://doi.org/10.3168/jds.S0022-0302(81)82563-5Get rights and content
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Abstract

One Catahoula Leopard Cowdog and three German Shepherd dogs, previously trained to detect odors characteristic of estrus in cows, were used in three experiments to determine when estrus-related odor first appears, how long it persists, and when it disappears in relation to time of estrus. Samples were swabs of reproductive tract fluids taken from vaginas of cycling cows on die day of estrus, at diestrus (8 to 10 days after estrus), and at daily intervals before and after estrus. Estrous odor emerges slowly during the 3 days before estrus, reaches a definite peak in intensity on the day of estrus, and disappears within 1 day thereafter.

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