Embryo Loss Following Embryo Transfer in Cattle and Swine

Greve, T.; Campo, Marcelo Del

doi:10.1007/978-94-009-5038-2_15

Cited by 4 publications

(3 citation statements)

References 23 publications

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“…Because of the local unilateral relationship between the corpus luteum, its adjacent uterine horn and the embryo (Del Campo et al, 1977), the presence of two embryos within the ipsilateral uterine horn should significantly increase the chances of establishing a pregnancy compared with one embryo located in each uterine horn, provided that each embryo acts independently of the other. Based on an expected embryo-survival rate to term of about 60% following spontaneous ovulation and insemination (Sreenan & Diskin, 1986) and on an expected embryo-survival rate to term also of about 60% following single embryo transfer (Greve & Del Campo, 1986), the calving rate for a unilateral twin embryo distribution derived in this manner should be 84%. However, the observed calving rate for the unilateral group in Exp.…”

Section: Discussionmentioning

confidence: 99%

Effect of a unilateral or bilateral twin embryo distribution on twinning and embryo survival rate in the cow

Sreenan¹,

Diskin²

1989

Reproduction

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Uni- and bilateral twin embryo distributions were effected by the transfer of one embryo on Day 7 to the ipsi- or contralateral uterine horn of previously inseminated heifers (123, Exp. 1) or cows (95, Exp. 2). The embryo transfers were surgical in Exp. 1 and non-surgical in Exp. 2. Transferred and native embryos were distinguished by breed. Embryo survival rate was measured in a proportion (N = 40) of the heifers at Day 53 of gestation and in the remainder of the heifers and all of the cows at term. In the heifers (Exp. 1) overall pregnancy rates of 76% and 75% were recorded after uni- and bilateral twin embryo distributions respectively. Twinning rates of 55% and 60% at Day 53 of gestation and 60% and 60% at term were recorded for uni- and bilateral distributions respectively. In the cows (Exp. 2) calving rates of 61% and 63% and twinning rates of 33% and 38% were recorded following uni- and bilateral twin embryo distributions respectively. When the data from both experiments were combined, overall embryo survival rates were similar for both twin embryo distributions although the ipsilateral transfer of an embryo reduced the survival rate of the native embryo. It is concluded that the confinement of two embryos in one uterine horn on or after Day 7 does not depress pregnancy, twinning or overall survival rate to term.

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Section: Discussionmentioning

confidence: 99%

Effect of a unilateral or bilateral twin embryo distribution on twinning and embryo survival rate in the cow

Sreenan¹,

Diskin²

1989

Reproduction

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“…There is little doubt that cell numbers in transferred embryos are directly proportional to their chances of surviving in utero (Loskutoff et al, 1992; Table 1). This relationship has been appreciated qualitatively for many years and explains why pregnancy rates increase as the number of blastocysts transferred to each recipient increases from 0.5 to 1 (Heyman, 1985) and when whole or half-embryos are transferred as pairs rather than singletons (Greve and Del Campo, 1986). Conversely, it explains why transfer of embryos of poor morphological quality, or of those damaged by other manipulations that reduce cell numbers (e.g., suboptimal cryopreservation or culture), also results in low pregnancy rates (e.g., Markette et al, 1985;Heyman, 1985) and, particularly, a n increased probability of embryonic loss after day 24 (Willadsen and Polge, 1981;Heyman, 1985).…”

Section: Manipulating the Embryomentioning

confidence: 96%

Prospects for improving the survival rate of transferred embryos

Betteridge

Loskutoff

1993

Molecular Reproduction Devel

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“…(Accepted for publication August 2, 1988) For inducing twin, Greve and Del Campo (1986) (Rowson et al, 1971;Sreenan et al, 1975;Renard et al, 1977;Heyman and Renard, 1978;Newcomb et al, 1980;Anderson et al, 1982). A little information is available in the literature on embryonic mortality in bilateral pregnancies (Sreenan et al, 1975;Sreenan and Diskin, 1987 …”

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confidence: 99%