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Factors affecting gestation duration in the bitch
Journal article   Peer reviewed

Factors affecting gestation duration in the bitch

Bruce E Eilts, Autumn P Davidson, Giselle Hosgood, Dale L Paccamonti and David G Baker
Theriogenology, Vol.64(2), pp.242-251
2005
DOI: https://doi.org/10.1016/j.theriogenology.2004.11.007
PMID: 15955350
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Abstract

Canine Gestation Duration Litters Pups
A retrospective analysis was performed to determine the effects of age, breed, parity, and litter size on the duration of gestation in the bitch. Bitches at two locations were monitored from breeding to whelping. A total of 764 litters whelped from 308 bitches (36 large hounds, 34 Golden Retrievers, 23 German Shepherd Dogs (GSD), and 215 Labrador Retrievers). By breed, the number of whelpings was 152, 72, 58, and 482 for the hounds, Golden Retrievers, German Shepherd Dogs, and Labrador Retrievers, respectively. Whelping was predicted to be 57 d from the first day of cytologic diestrus in the hounds or 65 d from the initial progesterone rise in the other breeds. The average gestation duration (calculated as 8 d prior to Day 1 of cytologic diestrus in hounds or measured from the initial progesterone rise in other breeds) by breed (days ± S.D.) was 66.0 ± 2.8, 64.7 ± 1.5, 63.6 ± 2.1, and 62.9 ± 1.3 for the hounds, Golden Retrievers, German Shepherd Dogs, and Labrador Retrievers, respectively. The relationship of age, breed, parity, and litter size with the difference in gestation duration was evaluated using log linear modeling. Age or parity had no effect on gestation duration. Compared to Labrador Retrievers, the German Shepherd Dogs, Golden Retrievers and hounds were more likely to have a longer gestation duration; three, four and nearly eight times as likely, respectively. Bitches whelping four or fewer pups were significantly more likely to have a longer gestation duration than those whelping five or more pups; the prolongation averaging 1 d.

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39 Record Views
52 Times Cited - Web of Science

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Collaboration types
Domestic collaboration
Citation topics
3 Agriculture, Environment & Ecology
3.232 Veterinary Sciences
3.232.1281 Veterinary Reproductive Health
Web Of Science research areas
Reproductive Biology
Veterinary Sciences
ESI research areas
Plant & Animal Science
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