Document Detail

Factors affecting reproductive performance of dairy cows first inseminated after five weeks postpartum.
MedLine Citation:
PMID:  6875061     Owner:  NLM     Status:  MEDLINE    
Various factors influencing reproduction of 307 Holstein cows were evaluated. Sources of variation of several measures were estrous certainty, time of day of detected estrus and insemination, method of thawing semen, ease of cervix penetration, presence of clear mucus at insemination, service number, service sire, inseminator, age of cow, maximum ambient temperature on the service date, and milk yield. Interval to first service of older cows was longer than of younger cows and shorter for cows with higher milk yield. Conception rate was higher for inseminations before noon than after noon and tended to be lower at inseminations when milk yield was at the extremes (low or high). Rate of conception was similar for cows whether inseminated at early or later postpartum intervals. More services were required by cows that were inseminated when milk yield was at the extremes (low or high). Fewer days open were associated with fewer total services and younger age at conception. Cows inseminated with semen thawed in hot (65 degrees C, 7 to 10 s) or warm (35 degrees C, 30 s) water conceived earlier postpartum than did those inseminated with semen thawed in the cow. Submitting cows for insemination after detection of standing estrus, mounting activity, or less certain symptoms of estrus had no adverse effect on fertility or days open.
J S Stevenson; M K Schmidt; E P Call
Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Journal of dairy science     Volume:  66     ISSN:  0022-0302     ISO Abbreviation:  J. Dairy Sci.     Publication Date:  1983 May 
Date Detail:
Created Date:  1983-09-09     Completed Date:  1983-09-09     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:  1148-54     Citation Subset:  IM    
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MeSH Terms
Cattle / physiology*
Estrus Detection
Insemination, Artificial / veterinary
Milk / secretion
Time Factors

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

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