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Follicular Size Threshold for Ovulation Reassessed. Insights from Multiple Ovulating Dairy Cows.

Published version
Peer-reviewed

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Type

Article

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Authors

López-Gatius, Fernando  ORCID logo  https://orcid.org/0000-0002-1413-3862
Llobera-Balcells, Mònica 
Palacín-Chauri, Roger J 
Garcia-Ispierto, Irina  ORCID logo  https://orcid.org/0000-0001-6404-1248
Hunter, Ronald HF 

Abstract

In Bos. taurus cattle, follicular deviation to dominance begins when the selected ovulatory follicle reaches a mean diameter of 8.5 mm. The dominant follicle acquires the capacity to ovulate when it reaches a diameter of about 10 mm. In this study, data derived from 148 cows in estrus with one follicle of ovulatory size and another of 7-9 mm, reveal that the small follicle has the capacity to ovulate alone or with the dominant follicle; thus, giving rise to a single or twin pregnancy. This indicates that a follicle of deviation size may ovulate in the presence of a follicle of ovulatory size.

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Keywords

bovine, follicular size, ovulation failure, pregnancy rate, twins

Journal Title

Animals (Basel)

Conference Name

Journal ISSN

2076-2615
2076-2615

Volume Title

12

Publisher

MDPI AG