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J Equine Sci. 2017;28(4):159-161. doi: 10.1294/jes.28.159. Epub 2017 Dec 16.

Foaling rate of mares that were rebred after pregnancy loss in Hidaka, Japan.

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Hidaka Horse Breeders Association, Hokkaido 056-0002, Japan.
Equine Science Division, Hidaka Training and Research Center, Japan Racing Association, Hokkaido 057-0171, Japan.
Inoue Horse Clinic, Hokkaido 056-0001, Japan.
ELM Horse Clinic, Hokkaido 057-0025, Japan.
Hidaka Agriculture Mutual Aid Association, Hokkaido 056-0016, Japan.
Department of Clinical Veterinary Science, Obihiro University of Agriculture and Veterinary Medicine, Hokkaido 080-0834, Japan.


The purpose of this study was to evaluate foaling rates of mares that were rebred after the pregnancy loss in same reproductive season and to examine factors influencing them in Hidaka, Japan. The study included 82 Thoroughbred mares that had experienced pregnancy loss. The foaling rate of the mares that were rebred after pregnancy loss was 57.3%. The foaling rate decreased as the period until detection of pregnancy loss increased. Aging and lower body condition score of mares decreased the foaling rate.


Thoroughbred; equine reproduction; foaling rate; mare; pregnancy loss

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