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Publication type: Journal Article
Document type: Full Paper

Year: 1992

Author(s): Reichenbach, HD; Liebrich, J; Berg, U; Brem, G

Title: Pregnancy rates and births after unilateral or bilateral transfer of bovine embryos produced in vitro.

Source: J Reprod Fertil (95), 2 363-370.


Authors Vetmeduni Vienna:

Brem Gottfried


Abstract:
Late morulae and blastocysts produced in vitro were nonsurgically transferred to heifers by unilateral (n = 184) or bilateral (n = 94) transfer. Of the recipients, 58% had serum progesterone values > 1.4 ng ml-1 on day 21 and rectal palpation on day 35 showed that 50% (138 of 278) were pregnant. The embryonic mortality rate between days 21 and 35 was estimated to be about 14% and between days 36 and 90 to be about 12%. Of the animals, 8% aborted between days 91 and 250 of pregnancy. No difference was observed in pregnancy rates between unilateral transfer of one (47%) or two embryos (49%) and bilateral transfer (53%), or in the twinning rate between bilateral transfer (42%) and unilateral transfer of two embryos (33%). The pregnancy rate was 54% with embryos evaluated as morphologically excellent or good, 51 % with fair embryos and 26% with poor ones. A higher pregnancy rate (60%) was obtained after embryo transfer when the synchrony between recipient and embryo was -1 day.

Keywords Pubmed: Abortion, Veterinary - epidemiology : Animals - epidemiology : Birth Weight - epidemiology : Cattle - physiology : Cesarean Section - veterinary : Dystocia - epidemiology : Embryo Transfer - veterinary : Female - veterinary : Male - veterinary : Pregnancy - veterinary : Pregnancy Outcome - veterinary : Pregnancy Tests - veterinary : Pregnancy, Animal - physiology : Progesterone - blood : Sex Ratio - blood : Twins - blood

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