A STUDY ON THE POSSIBILITY FOR OBTAINING A TWO-FOETUS PREGNANCY BY EMBRYOTRANSFER

Tsonko Maslev, Tsvetomira Hristova, Svetla Stoycheva

Abstract: It is well known that twinning in cattle as a biological phenomenon is rarely observed. Twinning could be increased by transfer of two embryos or after transplantation of an embryo to a preliminary inseminated cow. The experiment was carried out with 10 Polled Hereford cows. They were artificially inseminated with semen of the same breed at natural oestrus. On the 6th day after that two defrosted Aberdin Angus embryos were placed in one of the uterus horns. The following results were obtained after the calving: Three of the cows delivered two calves (30%), four cows - one calf (40%), and three cows remained non-pregnant (30%). The study showed that placing a defrosted embryo in one of the uterus horns of preliminary inseminated cows could increase the prolificacy up to 30.3%.

Keywords: cows; embryotansfer; twinning

Date published: 2023-02-01