Document Detail

Factors affecting gestation length in the Thoroughbred mare.
MedLine Citation:
PMID:  12417119     Owner:  NLM     Status:  MEDLINE    
In order to assist in the accurate prediction of the timing of parturition in the mare true gestation length, along with the potential effect of a number of factors, was investigated. Data from 433 Thoroughbred foal pregnancies were used. Sequential ultrasonic scanning allowed the true gestation length (fertilisation-parturition) to be ascertained, as apposed to previous work, which used the mating-parturition interval. An average gestation length of 344.1 +/- 0.49 days was evident. Colt foal pregnancies were significantly (P < 0.001) longer (346.2 +/- 0.72) than fillies (342.4 +/- 0.65). Month of birth had a significant effect on gestation length in all foals (P < 0.001). With foals born in January having the shortest gestation lengths and those born in April the longest. Mare age, year of birth, stallion age, stud farm and the interval between ovulation and mating had no significant effect. It is concluded that (i) the gestation length range (315-388 days), all resulting in viable foals is noteworthy and of clinical importance when considering the classification of dysmaturity in foals, (ii) mares carrying colt foals due to be born in the middle of the breeding season (April) are likely to have the longer gestation lengths.
M C G Davies Morel; J R Newcombe; S J Holland
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Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  Animal reproduction science     Volume:  74     ISSN:  0378-4320     ISO Abbreviation:  Anim. Reprod. Sci.     Publication Date:  2002 Dec 
Date Detail:
Created Date:  2002-11-05     Completed Date:  2003-01-21     Revised Date:  2003-11-14    
Medline Journal Info:
Nlm Unique ID:  7807205     Medline TA:  Anim Reprod Sci     Country:  Netherlands    
Other Details:
Languages:  eng     Pagination:  175-85     Citation Subset:  IM    
Copyright Information:
Copyright 2002 Elsevier Science B.V.
Welsh Institute of Rural Studies, University of Wales, Aberystwyth, Ceredigion, SY23 3AL, UK.
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MeSH Terms
Age Factors
Horses / physiology*
Linear Models
Maternal Age
Pregnancy, Animal / physiology*
Retrospective Studies
Sex Factors

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

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