Document Detail

Association of fertility with numbers of antral follicles within a follicular wave during the oestrous cycle in beef cattle.
MedLine Citation:
PMID:  17635768     Owner:  NLM     Status:  MEDLINE    
The association between conception rate at first service and numbers of follicles developed during a follicular wave was examined in 102 suckled beef cows and 14 heifers. Follicular development was monitored using ultrasonography for either two (trial 1) or three (trial 2) consecutive oestrous cycles (pre-breeding, breeding and post-breeding equivalent). Animals were examined on alternate days from day 6 after first oestrus (day 0) until ovulation and from day 6 after insemination until next ovulation or day 24 of pregnancy and were observed for oestrus twice daily and inseminated artificially at either the second (trial 1) or third oestrus (trial 2). Cows were classified as having two or three waves of follicular development for each oestrous cycle. Numbers of follicles >or=4 mm per wave were determined, and based on the maximum diameter they attained, were classified as small (4-6 mm), medium (7-10 mm) or large (>or=11 mm) follicles. Total numbers of follicles, and primarily numbers of small and medium follicles, were affected by trial and within trial by cow, oestrous cycle and follicular wave. Heifers had more small and total numbers of follicles, but fewer large follicles than cows in trial 1 (p < 0.05). The average number of antral follicles per wave in the breeding cycle or post-breeding period did not affect conception rates, which averaged 84%. Repeatability of the total numbers of antral follicles between and among oestrous cycles and follicular waves ranged from 0.01 to 0.97. In conclusion, fertility was not affected by the numbers of antral follicles >or=4 mm in diameter in a single follicular wave.
M J Starbuck-Clemmer; H Hernandez-Fonseca; N Ahmad; G Seidel; E K Inskeep
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Publication Detail:
Type:  Journal Article; Research Support, U.S. Gov't, Non-P.H.S.    
Journal Detail:
Title:  Reproduction in domestic animals = Zuchthygiene     Volume:  42     ISSN:  0936-6768     ISO Abbreviation:  Reprod. Domest. Anim.     Publication Date:  2007 Aug 
Date Detail:
Created Date:  2007-07-19     Completed Date:  2007-09-06     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  9015668     Medline TA:  Reprod Domest Anim     Country:  Germany    
Other Details:
Languages:  eng     Pagination:  337-42     Citation Subset:  IM    
Division of Animal and Veterinary Sciences, West Virginia University, Morgantown, WV, USA.
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MeSH Terms
Cattle / physiology*
Estrus / physiology*
Fertility / physiology*
Insemination, Artificial / veterinary
Ovarian Follicle / physiology*
Pregnancy Rate

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine

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