Hannan MA, Haneda S, Itami Y, Wachi S, Saitoh T, Cheong SH, Nambo Y. Successful embryo transfer from
Hokkaido native pony after artificial insemination with frozen semen.
J Vet Med Sci 2018;
81:241-244. [PMID:
30606892 PMCID:
PMC6395199 DOI:
10.1292/jvms.18-0414]
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Abstract
There has been no report of equine embryo transfer in Japan for the last 24 years. Our
objective was to establish an effective protocol for embryo transfer in domestic horse. A
Hokkaido native pony was bred by deep-horn artificial insemination with frozen semen from
a Connemara pony. Embryo collection was performed using a non-surgical method on day 7.
Two embryos were obtained from three flushes (67% recovery) and were transferred fresh
into crossbred recipient mares. Both recipient mares were diagnosed pregnant (100%
pregnancy rate) 5 days after embryo transfer and had normal progesterone levels until the
end of the observation on day 35 of gestation. This is the first successful embryo
transfer in Japan by artificial insemination using frozen semen. Embryo transfer
technology could be extremely useful in improving the productivity of Japanese domestic
and special riding horses.
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