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  Discussion on Research Summary: Early embryonic loss risk factors
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DrO

Posted on Saturday, Nov 10, 2007 - 9:53 am:

Early embryonic loss is usually defined as a loss of pregnancy after day 15 but before day 40. Though few surprises here this is a wonderful study that reviews risks factors for early embryonic loss in horses. In this study 75% occurred before day 26. In normal horses without any of the following risk factors the rate of EEL was almost 10%:
Barren Mares 17%
Age greater than 15 15%
More than 10 past pregnancies 18%
Breeding early in the year 18%
Breeding on foal heat 24%
Fluid remaining in the uterus after breeding 18%
Twin vesicles 24%

For more see the article Early Embryonic Loss & Abortion.
DrO

J Vet Med Sci. 2007 Aug;69(8):787-92.
Factors concerning early embryonic death in thoroughbred mares in South Korea.
Yang YJ, Cho GJ.
Equine Hospital, Korea Racing Association, Gwacheon, Gyeonggi 427-711, South Korea.

A total of 384 Thoroughbred mares were investigated to determine and evaluate the features of early embryonic death at nine equine farms on Jeju Island, South Korea, from 2001 to 2003. Overall, 771 matings for 384 mares resulted in 376 pregnancies 15 days after ovulation. Subsequently, 12.2% (46/376) of these early conceptuses were lost within 45 days after ovulation. Furthermore, about three quarters of the 46 embryonic deaths occurred between 16 and 25 days after ovulation. The incidence of embryonic death was highest in the barren (17.2%), more than 15 years old (15.4%), and more than 10 parities (18.2%) groups compared with the other groups (9.1-16.9%). Mares mated in March, April, and during the first estrus postpartum had higher embryonic death rates, (19.6%, 17.2%, and 24.6%, respectively). Mares with abnormal fluid and cysts in the uterus (18.0%) or multiple embryonic vesicles (23.1%) had higher embryonic death rates than those with normal uterine conditions (9.8%) or single embryonic vesicles (10.5%). The condition of mares, such as breeding condition and the environment of the embryo or fetus, are the major factors in relation to occurrence of early embryonic death.
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