Embryo Transfer in Anovulatory Recipient Mares Treated with Estradiol Benzoate and Long-Acting Progesterone

This study aimed to prepare anovulatory mares in anestrus or in the transitional period as embryo recipients. Ninety embryo-recipient mares were divided into two groups (G). G1 (n = 45) comprised animals in anestrus or in the transitional period; these animals were treated for 3 days (D) with 5, 3,...

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Published in:Journal of equine veterinary science 2013-03, Vol.33 (3), p.205-209
Main Authors: Kaercher, Fernanda, Kozicki, Luiz Ernandes, Camargo, Carlos Eduardo, Weiss, Romildo Romualdo, dos Santos, Ivo Walter, Muradas, Priscilla Ricabone, Bertol, Melina Andrea Formighieri, de Abreu, Renata Azevedo
Format: Article
Language:English
Subjects:
anestrus
anovulation
Anovulatory recipient mares
Embryo transfer
estradiol
Estradiol benzoate
Long-acting progesterone
mares
pregnancy
progesterone
Quarter Horse
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Summary:This study aimed to prepare anovulatory mares in anestrus or in the transitional period as embryo recipients. Ninety embryo-recipient mares were divided into two groups (G). G1 (n = 45) comprised animals in anestrus or in the transitional period; these animals were treated for 3 days (D) with 5, 3, and 2 mg of estradiol benzoate (intramuscular) on D0 (day of the donor's ovulation), D1, and D2 (after ovulation), respectively, followed by weekly application of 400 mg of long-acting progesterone (intramuscular) from D3 after ovulation (donor) until the 120th day of gestation. G2 (n = 45) comprised mares with normal estrous cycles. Plasma levels of progesterone (P4) were measured on days D1, D2, D8, and D14. Sixty percent of the animals in G1 and 71.1% in G2 (P > .05) completed the pregnancy. On D8, there was no difference in P4 levels between G1 and G2 animals, but there was a difference in P4 levels on D14 (P < .05). It was concluded that anovulatory mares in anestrus or in the transitional period could be used as embryo recipients. The protocol was efficient and also considered an appropriate alternative to prepare the uterine environment for embryo transfer; long-acting progesterone administration kept P4 levels high enough to maintain pregnancy until the 120th day and provided recipients during the time of the year when fewer mares were cycling and ovulating.
ISSN:0737-0806
1542-7412
DOI:10.1016/j.jevs.2012.06.009