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J Vet Sci. 2008 Mar;9(1):103-107 |
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Laparoscopy vs. laparotomy for embryo transfer to produce transgenic goats (Capra hircus)
Sang Tae Shin1,*, Sung Keun Jang1, Hong Suk Yang1, Ok Keun Lee1, Yhong Hee Shim1, Won Il Choi1, Doo Soo Lee1, Gwan Sun Lee2, Jong Ki Cho1, Young Won Lee1 |
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1College of Veterinary Medicine, Chungnam National University, Daejeon 305-764, Korea
2Hanmi Research Center, Hwaseong 445-813, Korea
* stshin@cnu.ac.kr |
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This study was performed to produce transgenic Korean
native goat (Capra hircus) by laparoscopic embryo transfer
(ET) to overcome the limitations of ET performed by
laparotomy. Transgenic embryos were produced by DNA
pronuclear microinjection of in vivo zygotes. The recipient
goats were synchronized for estrus by using an introvaginal
progesterone devices as a controlled internal drugreleasing
insert (CIDR) for 13 days and injection of 400 IU
PMSG 48 h before removal of the insert. Embryos were
transferred on day 3 and 4 after removal of the insert.
Recipient goats were deprived of feed for 48 h, then
suspended in a laparotomy cradle at an angle of 45o. After
obtaining a sufficient pneumoperitoneum, the laparoscope
and forceps were inserted abdominally through 5 mm
trocar sleeves. Examination of the ovaries and uterus was
performed and then 213 embryos were transferred into the
oviducts via the infundibula of 76 recipient goats. To
compare pregnancy rates, ET was also performed by
laparotomy in 82 recipient goats. The pregnancies in the
recipient goats were diagnosed by ultrasound on day 30
after embryo transfer. The pregnancy rate with
laparoscopic ET was significantly higher than with ET
performed by laparotomy (46.1% vs. 28.6%, p £¼ 0.05). In
addition, the pregnancy rates were compared between
ovulated and non-ovulated ovaries of the recipient goats in
the laparoscopic ET group. No significant difference was
observed between the pregnancy rates of ovulated and
non-ovulated ovaries (41.3% vs. 33.3%, p £¼ 0.05) suggesting
that ET may also be possible in non-ovulated recipients
through artificial rupture of Graafian follicles. These
results suggest that laparoscopic ET is a highly efficient
method for the transfer of goat embryos.
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