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- W4230482034 abstract "Early embryo mortality results in significant inefficiency in cattle breeding. A pregnancy rate of 65-70% to a single service, AI or transfer of fresh embryos is considered to be very good indeed. A pregnancy rate of 55-60% using frozen embryos would also be considered very good. Of the 30%, or so, of cattle which do not become pregnant to a single service, approximately one quarter are accounted for by fertilisation failure (Diskin and Sreenan, 1980; Roche et al, 1981) and another quarter by cytogenetic abnormalities in the embryos, which usually occur within the first few days after fertilisation (Hare et al. 1980; Gayerie de Abreu et al, 1984). Failure in the communication between embryo and uterus probably accounts for the remaining 50% of pregnancy loss. Fertilisation failure and early deaths due to cytogenetic abnormalities are by-passed by embryo transfer (ET) so that other causes of loss become rather more significant." @default.
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- W4230482034 date "1992-03-01" @default.
- W4230482034 modified "2023-10-14" @default.
- W4230482034 title "Embryo mortality in maiden hereford x friesian heifers following embryo transfer" @default.
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- W4230482034 doi "https://doi.org/10.1017/s030822960002170x" @default.
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