Effect of site of transfer on pregnancy and twinning rates following bilateral egg transfer in the cow

Sreenan, J.M.; Beehan, D.

doi:10.1530/jrf.0.0480223

Cited by 14 publications

(3 citation statements)

References 2 publications

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“…It has been reported elsewhere that the greatest embryonic loss occurs soon after transfer [33,34], and that a large percentage of embryos classified as excellent or good do not survive [35]. In this study, the greatest loss (57%) occurred by day 30 after estrus.…”

Section: Discussionsupporting

confidence: 45%

Effect of Administration with Low-dose FSH to Recipient Cows on Embryonic Survival after Bilateral Nonsurgical Embryo Transfer.

Kojima¹,

Shimizu²,

Tomizuka³

1995

Journal of Reproduction and Development

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Section: Discussionsupporting

confidence: 45%

Effect of Administration with Low-dose FSH to Recipient Cows on Embryonic Survival after Bilateral Nonsurgical Embryo Transfer.

Kojima¹,

Shimizu²,

Tomizuka³

1995

Journal of Reproduction and Development

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“…A random sample of those diagnosed as pregnant was then slaughtered from each of the ipsilateral (N = 20) and contralateral ( = 20) transfer groups at Day 53 of gestation to provide a measure of embryo survival rate up to the time of completion of implantation. Confirmation of a viable pregnancy and embryo survival at this time was based on the expected weight for age of each fetus, its fetal fluids and membranes (Sreenan & Beehan, 1976). The remaining heifers diagnosed as pregnant (N = 53) were held to full term but were pregnancy tested by palpation again on Day 150 from insemination.…”

Section: Methodsmentioning

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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“…The non-surgically transferred embryos were seldom placed further into the uterine horn than the intercornual ligament whereas surgically transferred embryos were placed near to the tip of the uterus. From the work of Sreenan & Beehan (1976) and Newcomb et al (1977) site of transfer does not appear to be important. It may be concluded therefore that the transfer method itself is in some way responsible for the poor fetal survival rate after non-surgical transfer.…”

mentioning

confidence: 91%

Comparison of the fetal survival rate in heifers after the transfer of an embryo surgically to one uterine horn and non-surgically to the other

Newcomb¹,

Christie²,

Rowson³

1978

Reproduction

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Effect of site of transfer on pregnancy and twinning rates following bilateral egg transfer in the cow

Cited by 14 publications

References 2 publications

Effect of Administration with Low-dose FSH to Recipient Cows on Embryonic Survival after Bilateral Nonsurgical Embryo Transfer.

Effect of Administration with Low-dose FSH to Recipient Cows on Embryonic Survival after Bilateral Nonsurgical Embryo Transfer.

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

Comparison of the fetal survival rate in heifers after the transfer of an embryo surgically to one uterine horn and non-surgically to the other

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