Document Detail

Predisposition to repeat breeding in UK cattle and success of artificial insemination alone or in combination with embryo transfer.
MedLine Citation:
PMID:  20622202     Owner:  NLM     Status:  MEDLINE    
To investigate whether there was a subpopulation of repeat breeders (cows or heifers that returned to oestrus after three inseminations) that were less fertile after a fourth artificial insemination (AI) with or without additional embryo transfer, and to estimate the efficacy of AI plus embryo transfer to overcome repeat breeding problems, a two-part investigation was carried out. Part 1 involved 85 repeat breeders and 85 controls subjected to AI alone. In part 2, 128 repeat breeders received AI on day 0 plus an embryo transfer seven days later, while controls received embryo transfer alone on day 7. In repeat breeders, the interval between calving and pregnancy was 80 days longer than in the controls (P=0.01), irrespective of previous fertility treatment which had mainly focused on the ovaries. The incidence of dystocia was similar in repeat breeders and in controls, but repeat breeders had a higher previous incidence of moderate uterine infection compared with controls (P=0.04). In repeat breeder cows, pregnancy rates for AI alone were 30 per cent after the fourth AI (controls: 45 to 64 per cent after one to three inseminations) compared with 52.6 per cent after a fourth AI with embryo transfer (controls with embryo transfer alone: 49 per cent). Successful pregnancies after a fourth AI plus embryo transfer produced a 6.25 per cent incidence of twins.
S Canu; M Boland; G M Lloyd; M Newman; M F Christie; P J May; R M Christley; R F Smith; H Dobson
Publication Detail:
Type:  Evaluation Studies; Journal Article    
Journal Detail:
Title:  The Veterinary record     Volume:  167     ISSN:  2042-7670     ISO Abbreviation:  Vet. Rec.     Publication Date:  2010 Jul 
Date Detail:
Created Date:  2010-07-12     Completed Date:  2010-09-13     Revised Date:  2012-05-10    
Medline Journal Info:
Nlm Unique ID:  0031164     Medline TA:  Vet Rec     Country:  England    
Other Details:
Languages:  eng     Pagination:  44-51     Citation Subset:  IM    
Department of Veterinary Clinical Science, University of Liverpool, Leahurst, Neston, Wirral CH64 7TE.
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MeSH Terms
Breeding / methods*
Case-Control Studies
Cattle / physiology*
Dystocia / epidemiology,  veterinary
Embryo Transfer / veterinary*
Fertility / physiology*
Great Britain / epidemiology
Insemination, Artificial / veterinary*
Pregnancy Rate
Uterine Diseases / epidemiology,  veterinary

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

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