1998
DOI: 10.1016/s0093-691x(98)00098-3
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Production of sheep embryos in vitro and development of progeny following single and twin embryo transfers

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Cited by 39 publications
(29 citation statements)
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“…Similar findings after the transfer of in vitro produced embryos have been reported previously for sheep (Walker et al 1992, Thompson et al 1995, Holm et al 1996, Brown & Radziewic 1998. A number of factors have been implicated in the birth of large offspring after ET of in vitro produced embryos (reviewed by Walker et al 1992Walker et al , 1996 including asynchronous ET (Wilmut & Sales 1981), particularly after the transfer of vitrified embryos (Naitana et al, 1995, Leoni et al 2003, progesterone treatment of ewes early in gestation (Kleeman et al 1994) and the use of serum as the source of protein during in vitro culture (Thompson et al 1995).…”
Section: Discussionsupporting
confidence: 68%
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“…Similar findings after the transfer of in vitro produced embryos have been reported previously for sheep (Walker et al 1992, Thompson et al 1995, Holm et al 1996, Brown & Radziewic 1998. A number of factors have been implicated in the birth of large offspring after ET of in vitro produced embryos (reviewed by Walker et al 1992Walker et al , 1996 including asynchronous ET (Wilmut & Sales 1981), particularly after the transfer of vitrified embryos (Naitana et al, 1995, Leoni et al 2003, progesterone treatment of ewes early in gestation (Kleeman et al 1994) and the use of serum as the source of protein during in vitro culture (Thompson et al 1995).…”
Section: Discussionsupporting
confidence: 68%
“…Incidence of lambs with large birth weights (range: 2.5 -9.5 kg) was higher than that reported for naturally bred Merino lambs (4 kg; Brown & Radziewic 1998) and the lambs born from the same flock of ewes after AI with non-sorted (control) or sorted frozen-thawed spermatozoa (range: 3.1 -5.4 kg; Hollinshead et al, 2002a). Similar findings after the transfer of in vitro produced embryos have been reported previously for sheep (Walker et al 1992, Thompson et al 1995, Holm et al 1996, Brown & Radziewic 1998.…”
Section: Discussionmentioning
confidence: 54%
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“…Embryonic cells start to differentiate in to inner cell mass and trofectoderm cells at the morula stage, in a process mediated by growth factors which play a key regulatory role [38]. Serum increases the blastocyst cell number [11,13,15,17] and high molecular mass components of serum could be responsible for this cell proliferation in blastocysts [17,50]. In our study, embryos produced with CPSR-3 1 showed comparable cell numbers and the same ratio inner cell mass number/total cell number to those of embryos cultured with serum, which suggests that CPSR-3 1 contains the factors necessary for embryonic cell differentiation, similar to FCS.…”
Section: Discussionmentioning
confidence: 99%
“…Two studies using the same percentage of serum (10%), as the present work, yielded cleavage and blastocyst rates of 82 and 34% (Obrien et al 1997) and 79 and 58.3% respectively (Zhu et al 2007). Previously, the use of 2% heat-inactivated sheep serum in IVM medium has produced embryo cleavage rates of 88% and blastocyst rates of 31% (Brown & Radziewic 1998). The serum-free IVM system reported here demonstrated cleavage rates of 67.7% and blastocyst formation of 34.5% (Table 1).…”
Section: Discussionmentioning
confidence: 67%