Document Detail

Comparison of two estrus synchronization programs in a large, confinement-housed dairy herd.
MedLine Citation:
PMID:  9448825     Owner:  NLM     Status:  MEDLINE    
OBJECTIVE: To compare pregnancy rates, seasonal effects, and economic benefits of 2 estrus synchronization programs for a confinement-housed dairy herd. DESIGN: Prospective cohort study. ANIMALS: 200 lactating Holstein cows. PROCEDURE: Cows eligible for breeding were palpated per rectum and randomly assigned to 2 treatment groups during 4 seasonal periods. Cows in one group (Ovsynch) received injections of gonadotropin releasing hormone (GnRH) on day 0, prostaglandin F2 alpha on day 7, and a second injection of GnRH on day 8. Cows in the other group (PP) that had a palpable corpus luteum were given prostaglandin F2 alpha. Estrus detection was not performed on the Ovsynch cows, which were artificially inseminated at a predetermined time after the second GnRH injection. Cows in the PP group were observed for signs of estrus, and only those that were detected in estrus were inseminated. RESULTS: Pregnancy rates and insemination rates were significantly improved for cows in the Ovsynch group, compared with cows in the PP group. CLINICAL IMPLICATIONS: The Ovsynch program was an economically advantageous method for controlling reproduction that resulted in pregnancies without the need for estrus detection.
J S Britt; J Gaska
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Publication Detail:
Type:  Comparative Study; Journal Article    
Journal Detail:
Title:  Journal of the American Veterinary Medical Association     Volume:  212     ISSN:  0003-1488     ISO Abbreviation:  J. Am. Vet. Med. Assoc.     Publication Date:  1998 Jan 
Date Detail:
Created Date:  1998-02-18     Completed Date:  1998-02-18     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  7503067     Medline TA:  J Am Vet Med Assoc     Country:  UNITED STATES    
Other Details:
Languages:  eng     Pagination:  210-2     Citation Subset:  IM    
Department of Medical Science, School of Veterinary Medicine, University of Wisconsin-Madison 53706-1102, USA.
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MeSH Terms
Animal Husbandry / economics,  methods
Cattle / physiology*
Cohort Studies
Dairying / economics,  methods*
Dinoprost / pharmacology
Estrus / drug effects,  physiology
Estrus Synchronization*
Gonadotropin-Releasing Hormone / pharmacology
Housing, Animal*
Insemination, Artificial / veterinary
Lactation / physiology
Pregnancy Rate
Prospective Studies
Random Allocation
Reg. No./Substance:
33515-09-2/Gonadotropin-Releasing Hormone; 551-11-1/Dinoprost

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

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