Document Detail

Controlling the dominant follicle in beef cattle to improve estrous synchronization and early embryonic development.
MedLine Citation:
PMID:  21755687     Owner:  NLM     Status:  MEDLINE    
Estrous synchronization and timed ovulation programs that permit AI at a predetermined time (timed AI) rather than as determined by detection of spontaneous estrus are requisite for increased adoption of AI in the beef cattle industry. In the past two decades, significant progress has been achieved in developing programs that synchronize ovulation to address this need. While this progress has been driven by a multitude of fundamental discoveries in reproductive biology, the greatest impact in the past two decades has been the result of enhanced understanding of the pattern of ovarian follicle growth in cattle and development of technologies to coordinate growth and ovulation of the dominant follicle. At present, estrous synchronization programs that result in acceptable timed AI pregnancy rates are available for beef cattle. The capacity to control growth of the dominant follicle and evaluate the impact of various approaches on fertility has resulted in greater understanding of the factors that influence maturity of ovulatory follicles. Modifications to the standard industry breeding programs, with the aim of lengthening and/or increasing the gonadotropic stimulus and estradiol production by preovulatory follicles, have been shown to substantially increase timed AI pregnancy rate in beef cattle. Associations between characteristics of follicular development and fertility have surfaced from application of estrous and ovulation synchronization technologies and led to investigation of the fundamental mechanisms that underlie these relationships.
M L Day; M L Mussard; G A Bridges; C R Burke
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't; Research Support, U.S. Gov't, Non-P.H.S.    
Journal Detail:
Title:  Society of Reproduction and Fertility supplement     Volume:  67     ISSN:  1747-3403     ISO Abbreviation:  Soc Reprod Fertil Suppl     Publication Date:  2010  
Date Detail:
Created Date:  2011-07-15     Completed Date:  2011-08-18     Revised Date:  2014-06-13    
Medline Journal Info:
Nlm Unique ID:  101295315     Medline TA:  Soc Reprod Fertil Suppl     Country:  England    
Other Details:
Languages:  eng     Pagination:  405-19     Citation Subset:  IM    
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MeSH Terms
Cattle / embryology*,  physiology
Embryonic Development / physiology*
Estrus Synchronization / methods*
Ovarian Follicle / drug effects,  physiology*

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

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