Document Detail

Fertility of norgestomet treated suckler cows.
MedLine Citation:
PMID:  582487     Owner:  NLM     Status:  MEDLINE    
Four studies are described involving 3050 single suckled mainly Hereford-Friesian cross beef cows treated with norgestomet and oestradiol valerate to control the ovarian cycle. In study 1 the effect of insemination timing on pregnancy rate was studied. A greater proportion of cows inseminated 48 and 72 hours after treatment became pregnant than after a single insemination at 48 hours. In study 2 large variations in fertility among farms were recorded in field trials of norgestomet and oestradiol valerate. In study 3 the effect on fertility of nutrition, weight and body condition was examined. In study 4 57.9 per cent of 1113 treated cows became pregnant to insemination at 48 and 72 hours. Cows were fed a balanced ration designed to provide for a predicted daily milk yield of 9.0 kg for a 12-week period starting six weeks before insemination. The range of fertility was from 36.7 per cent to 94.9 per cent.
S B Drew; D F Wishart; I M Young
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Publication Detail:
Type:  Comparative Study; Journal Article    
Journal Detail:
Title:  The Veterinary record     Volume:  104     ISSN:  0042-4900     ISO Abbreviation:  Vet. Rec.     Publication Date:  1979 Jun 
Date Detail:
Created Date:  1979-10-24     Completed Date:  1979-10-24     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  0031164     Medline TA:  Vet Rec     Country:  ENGLAND    
Other Details:
Languages:  eng     Pagination:  523-5     Citation Subset:  IM    
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MeSH Terms
Animal Feed
Body Weight
Cattle / metabolism,  physiology*
Estradiol / pharmacology
Estrus / drug effects
Insemination, Artificial / veterinary
Ovulation / drug effects
Pregnenediones / pharmacology*
Reg. No./Substance:
0/Pregnenediones; 50-28-2/Estradiol

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

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