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

Animals

Irina Garcia-Ispierto¹  Roger J. Palacín-Chauri²  Mònica Llobera-Balcells²  Ronald H. F. Hunter³  Fernando López-Gatius⁴ 

[1] Agrotecnio Centre, 25198 Lleida, Spain;Department of Animal Science, University of Lleida, 25198 Lleida, Spain;Sidney Sussex College, University of Cambridge, Cambridge CB2 3HU, UK;Transfer in Bovine Reproduction SLu, 22300 Barbastro, Spain;

关键词: bovine;    follicular size;    ovulation failure;    pregnancy rate;    twins;   

DOI  :  10.3390/ani12091140

来源: DOAJ

【 摘 要 】

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.

【 授权许可】

Unknown