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CONTACT SES

Superior Equine Sires
P. O. Box 4035
Spokane, WA 99220

Shipping address:
623 E. 18th Ave.
Spokane, WA 99203

Contact Carol Austin:
CALL 509-838-9922
Morning calls preferred
Closed Sundays & holidays

fax: 509-838-7688
info@superiorequinesires.com

 

Equine Reproduction Basics

from Ovulation to Conception

FROM OVULATION TO CONCEPTION

  • At ovulation the mare sheds an egg from her ovary, and the egg quickly travels into her fallopian tube.
  • The mare is inseminated post-ovulation.
  • Within minutes, the sperm is drawn into the fallopian tube by uterine contractions, not swimming. 90% of mares conceive at this time.
  • After fertilization, the embryo will remain in the tube for five or six days, before moving into the uterus.
  • Following 10 days of moving around the uterus, the embryo becomes more stationary.
  • At about 37 days, the embryo attaches to the wall of the uterus by endometrial cups, which are the beginnings of the placenta.
  • The placenta produces progesterone, to help maintain the pregnancy. Before its development and attachment, blood levels of progesterone support the pregnancy.

EARLY EMBRYONIC DEATH

  • The highest incidence of early embryonic death occurs before day 11, when the embryo enters the uterus. Often it occurs by day five or six. This happens in about 24% of normal mares.
  • The next highest incidence of embryonic death occurs between days 14 to 40, in about 17% of normal mares.

Factors contributing to early embryonic death:

  • When mares are bred post-ovulation, the egg may not live as long as the sperm, and may have aged and become defective.
  • Stress caused by environment and management may cause lethal stress to the embryo.
  • Hormone deficiencies and imbalances, the uterine environment, and the age of the mare can all be contributing factors to early embryonic death.

CONCEPTION STATISTICS FOR FROZEN SEMEN

  • The national average for first cycle conception using fresh cooled semen is 60%.
  • The national average for first cycle conception using frozen semen is 60-70%.
  • The average number of cycles per conception using frozen semen is 2.5 per mare.
  • The end-of-season conception rate for both fresh cooled and frozen semen is about the same--70-75%.
  • Most mares in good breeding condition will achieve a pregnancy within two cycles, but many settle on one cycle. Few mares take three cycles to conceive.
  • The conception rate with frozen semen is at least as good as, if not better than, the rates of live cover and fresh-cooled breeding. When breeders purchase frozen semen with no guarantee, they are very careful to select an excellent mare candidate and an experienced veterinarian, thus improving their conception rate.
 

Conception Database

DATABASE INSTRUCTIONS

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Kathy St Martin/Jos Motterhead
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