Welcome to Chinese Agricultural Science Bulletin,

Chinese Agricultural Science Bulletin ›› 2023, Vol. 39 ›› Issue (10): 130-135.doi: 10.11924/j.issn.1000-6850.casb2022-0907

Special Issue: 畜牧兽医

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Effect of Different Superovulation Schedules and Donor Cows Ages on Production Efficiency of Sexed Embryos for High Yielding Holstein Cows in Vitro

SUN Wei1(), LV He1, WANG Chao1, ZHAO Yongchao1, GUO Yaxin1, WANG Feifei1, LIU Tao1, WANG Maojun1, BAO Xiangnan1, ZHANG Bozhao1, Cao Guifang1,2, LI Haijun2, LI Xihe1,3()   

  1. 1 Inner Mongolia Saikexing Institute of Breeding and Reproductive Biotechnology in Domestic Animal Co., Ltd., Hohhot 011517
    2 College of Veterinary, Inner Mongolia Agricultural University, Hohhot 010010
    3 Institute for Animal Genetic Resources of Mongolia Plateau, College of Life Science, Inner Mongolia University, Hohhot 010070
  • Received:2022-11-01 Revised:2023-02-22 Online:2023-04-05 Published:2023-03-27

Abstract:

The purpose of the study is to investigate the effects of hormone treatment and donor age on superovulation and production efficiency of sex control embryos for high yielding Holstein cows in vitro, and provide technical support for the establishment of stable and efficient superovulation schedule and the improvement of production efficiency of sex control embryos for high yielding Holstein cows in vitro. A total of 60 high yielding Holstein cows were randomly selected and divided into 3 groups. OPU-IVF for embryo production was performed according to FSH injection schedule: bi-weekly (BW), once weekly (OW) and no injection (CON) in vitro. The best schedule was used to further study whether there was difference in embryo production efficiency in vitro between young cattle and postpartum cattle. The superovulation effect of BW group was better than that of OW and CON groups. The number of available ovum (15.30±0.60), the proportion of available ovum (68.83%±1.92%), the number of grade A ovum (9.86±0.38) and the number of grade B ovum (5.44±0.37) in BW group were significantly higher than those of OW group. The in vitro development of IVF early embryos in BW group was better than that in OW and CON groups. The cleavage rate (77.80%±1.08%) and the number of embryos per cow (5.11±0.27) in BW group were higher than those of OW and CON groups, and the differences were significant. The proportion of grade B embryos (13.95%±1.23%) in BW and CON groups was significantly lower than that in OW group. The number of average ovum (27.10±1.35) and embryo per cow (5.29±0.28) in postpartum cattle group were significantly higher than those of young cattle group, but the ovum availability was significantly lower than that of young cattle group, which was 64.44%±1.81% and 75.01%±2.33%, respectively. The BW group had the best superovulation schedule, under which the production efficiency of sex control embryos in vitro of postpartum cattle was significantly higher than that of young cattle.

Key words: high yielding Holstein cows, FSH, superovulation, ovum pick-up, sex control embryos production in vitro