КРИОУСТОЙЧИВОСТЬ И ЖИЗНЕСПОСОБНОСТЬ ЭМБРИОНОВ КРУПНОГО РОГАТОГО СКОТА

Аннотация

Bovine embryos at stage of development 7-8 days were estimated morfologically after nonsurgical recovery.
Repeated morfological estimation was carried out after cryopreservation and thawing. The prediction of
the pregnancy rate after transplantation of thawed embryos was made by the comparison of morphological
estimations before freezing and after freezing.
It happened that the pregnancy rate of recipients after embryotransfer was back proportional to the degree
of reducing of thawed embryos quality. The embryos viability after transfer was 56,9% (n=218), if their
quality mark before cryopreservation was same as after cryopreservation. The pregnancy rates were 43,1%
(n=534) and 29,3% (n=99) when the quality marks of thawed embryos have been reduced respectively by
unity and more than by unity.
The coefficient of correlation was -0,98 (P<0,001). This method increases efficiency of embryo transfer as
it allows to utilize thawed embryos with quality mark fair that they have been before freezing too. The
pregnancy rate after transfer these embryos (n=30) was 43,3%.