STUDY ON QUANTITY, QUALITY AND STAGES OF DEVELOPMENT OF EMBRYOS RECOVERED FROM SUPEROVULATED COWS AND HEIFERS OF DIFFERENT BREEDS IN NORTH-EAST KAZAKHSTAN
Аннотация
This paper presents the research on the zygotes production, evaluation
and transfer in Simmental and Kazakh whitehead cows and heifers, bred
in the North-East of Kazakhstan. It was identified that, by applying the
German drug «Pluset» in an optimal dose, the average numbers of embryos
that can be recovered from the Simmental breed are 8,2 from a cow
and 6,4 from a heifer. 66,0 % of embryos from cows were transferable,
17,0 % were non-transferable, 17,0 % of ovicells were unfertilized.
Embryos recovered from heifers were identified as transferable 53,1 %,
non-transferable 21,9 % and 25,0 % as unfertilized ovicells. The study
showed that the embryos recovered from cows and heifers can be found
in various stages of development: early morula, compact morula, early
blastocyst, blastocyst, hatching and expanded blastocysts. A Kazakh
whitehead cow produces 1,3 embryos more than a Simmental cow. The
percentage of developed embryos was 45 % in total transplanted embryos.
It was determined that the embryos transferred into heifers develop better
than embryos transferred into mature cows.
Автор
T. K. Seiteuov, M. A. Ayatkhan, T. K. Bexeitov, B. Ateikhan, M. Ye. Zhagiparova
DOI
https://doi.org/10.48081/DMYS6166
Ключевые слова
superovulation, ovary, corpus luteum, unfertilized ovicells, blastocysts, embryo, follicle, Dulbecco`s Phosphate Buffered Saline (DPBS), stage, uterus
Год
2021
Номер
Выпуск 4