China Animal Husbandry and Veterinary Medicine ›› 2021, Vol. 48 ›› Issue (2): 574-580.doi: 10.16431/j.cnki.1671-7236.2021.02.019

• Genetics and Breeding • Previous Articles     Next Articles

Study on the Influencing Factors of in vitro Fertilization Efficiency in Dairy Cows

WANG Tengfei1, ZHANG Yan2, WANG Yanping3, ZHAO Shanjiang1, ZHU Huabin1, WANG Lingling2, MA Zhu3, DAI Yunping4, PANG Yunwei1   

  1. 1. Institute of Animal Sciences, Chinese Academy of Agricultural Sciences, Beijing 100193, China;
    2. Shandong OX Livestock Breeding Co., Ltd., Jinan 250100, China;
    3. Beijing Dairy Cattle Center, Beijing 100192, China;
    4. China Agricultural University, Beijing 100193, China
  • Received:2020-07-21 Online:2021-02-20 Published:2021-02-23

Abstract: The aim of this study was to optimize the ovum pick-up (OPU) and in vitro fertilization system,and further improve the in vitro embryo production efficiency.The optimal in vitro culture medium was screened out by using fresh ovaries collected from slaughterhouses for in vitro fertilization.The effects of different bull semen and donor cows on the outcome of in vitro fertilization of oocytes collected by OPU were analyzed.The results showed that compared with CR1aa medium,mCR1aa medium had no significant effect on cleavage rate,but the blastocyst formation rate was significantly increased (28.1% vs 20.6%,P<0.05).Three Holstein bulls semen were randomly selected for in vitro fertilization,the proportion of cleaved embryos was not affected,but the blastocyst development rate of in vitro-produced embryos originating from No.1 bull semen (38.7%) was significantly higher than that of No.2 (23.8%) and No.3 bull semen (22.9%) (P<0.05).There was no significant difference in the average number of recovered oocytes obtained from three randomly selected donor cows (H1,H2 and H3),but the developmental ability of embryos after in vitro fertilization was significantly different.The cleavage rates blastocyst rates of H1 and H2 donors were significantly higher than that of H3 donors (P<0.05),and the blastocyst rate of H1 donor was significantly higher than that of H2 donor (P<0.05).In summary,mCR1aa medium significantly increased the blastocyst development rate,and could be used for in vitro embryo production,the individual variability in bull semen and donor cows could directly affect the production efficiency of in vitro embryo production.The results provided a reference for the optimization of OPU-in vitro fertilization technology.

Key words: dairy cow; ovum pick-up; in vitro fertilization; in vitro embryo; blastocyst

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