Document Detail


Double insemination and gonadotropin-releasing hormone treatment of repeat-breeding dairy cattle.
MedLine Citation:
PMID:  2229589     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
Our objective was to determine if double inseminations during the same estrous period of dairy cattle eligible for their third or fourth service (repeat breeders) would improve pregnancy rates equivalent to injections of GnRH given at the time of AI. Repeat-breeding, lactating cows from six herds (five herds in the San Joaquin Valley of central California and one herd in northeast Kansas) were assigned randomly to four treatment groups when detected in estrus: 1) single AI plus no injection, 2) single AI plus 100 micrograms GnRH at AI, 3) double AI plus no injection, or 4) double AI plus 100 micrograms of GnRH at AI. Inseminations were performed according to the a.m.-p.m. rule. The second AI for the double AI treatment was given 12 to 16 h after the first AI. Injections of GnRH were given intramuscularly immediately following the single AI or the first AI of the double AI. Pregnancy rates of cows given a single AI and hormone injection were numerically higher in all six herds than those of their herdmates given only a single AI. In five of six herds, the pregnancy rates of cows given a double AI and hormone injection were numerically higher than pregnancy rates of their herdmates given only a double AI. Overall pregnancy rates for the four treatments were 1) 112/353 (32.1%), 2) 165/406 (41.6%), 3) 119/364 (33.5%), and 4) 135/359 (37.5%). Gonadotropin-releasing hormone increased pregnancy rates of repeat breeders compared with controls given only a single AI. No further benefit beyond the single AI was accrued from the double AI treatment, with or without concurrent hormone administration.
Authors:
J S Stevenson; E P Call; R K Scoby; A P Phatak
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Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  Journal of dairy science     Volume:  73     ISSN:  0022-0302     ISO Abbreviation:  J. Dairy Sci.     Publication Date:  1990 Jul 
Date Detail:
Created Date:  1990-12-06     Completed Date:  1990-12-06     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  2985126R     Medline TA:  J Dairy Sci     Country:  UNITED STATES    
Other Details:
Languages:  eng     Pagination:  1766-72     Citation Subset:  IM    
Affiliation:
Department of Animal Sciences and Industry, Kansas State University, Manhattan 66506.
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MeSH Terms
Descriptor/Qualifier:
Animals
Cattle / physiology*
Estrus / physiology
Female
Fertility / drug effects*
Gonadotropin-Releasing Hormone / administration & dosage,  pharmacology*
Injections, Intramuscular / veterinary
Insemination, Artificial / methods,  veterinary*
Pregnancy
Random Allocation
Chemical
Reg. No./Substance:
33515-09-2/Gonadotropin-Releasing Hormone

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


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