China Animal Husbandry and Veterinary Medicine ›› 2023, Vol. 50 ›› Issue (10): 4077-4084.doi: 10.16431/j.cnki.1671-7236.2023.10.021

• Genetics and Breeding • Previous Articles     Next Articles

Effects of Addition of Insulin-Transferrin-Sodium Selenite on Effect of Production, Hypothermic Storage and Routine Freezing of Bovine in vitro Embryos

ZHANG Haobo, ZHAO Shanjiang, WANG Huan, XU Xi, FENG Zhiqiang, WANG Wanjie, GONG Jianfei, PANG Yunwei, DU Weihua, ZHU Huabin   

  1. Institute of Animal Sciences, Chinese Academy of Agricultural Sciences, Beijing 100193, China
  • Received:2023-02-17 Online:2023-10-05 Published:2023-09-26

Abstract: 【Objective】 This study was aimed to evaluate the effect of adding insulin-transferrin-sodium selenite (ITS) to production,4 ℃ hypothermic storage and programmed freezing system of bovine in vitro embryos,so as to improve the production and preservation effect of in vitro bovine embryos via ITS.【Method】 After in vitro fertilization of bovine oocytes derived from slaughterhouse ovaries,the following experiments were carried out:① An experiment to study the effect of adding ITS to anaphase culture medium M2 on blastocyst rate,with M2+ITS and M2-control (without ITS,control) groups. ② An experiment to further investigate the effect of adding ITS to prophase culture medium M1 on early embryonic development,with M1+M2+ITS(both M1 and M2 with ITS addition) and M1-control (without ITS addition but M2,control) groups. ③ An experiment to further evaluate the effect of ITS in improving embryonic development under three gases culture conditions,with ITS (with ITS) and control (without ITS) groups.The cleavage rate,day-7 blastocyst rate,and total blastocyst rate were calculated for each of the above groups.④ The day-7 bovine embryos were stored at 4 ℃ for 24 h by M2 storage solution with ITS (Hypo-ITS group),or day-7 in vitro embryos in frozen solution with ITS were frozen by programmed procedure (Cryo-ITS group),with Hypo-control (without ITS) and Cryo-control (without ITS) group,and the survival and hatching rates of the recovered and thawed embryos were counted,respectively.【Result】 Compared with control group,the day-7 blastocyst rates of M2+ITS and M1+M2+ITS groups were significantly increased (P<0.05);Under the three gas culture conditions,the day-7 blastocyst rate in ITS group was also significantly increased (P<0.05).There was no significant difference of the survival rate between Hypo-ITS and Hypo-control groups (P>0.05),but the hatching rate of Hypo-ITS group was significantly higher than that of Hypo-control group (P<0.05).There was no significant difference of the survival and hatching rates of programmed freezing between Cryo-ITS and Cryo-control groups (P>0.05).【Conclusion】 ITS could be used as additive and hypo-protectant to improve the effect of bovine in vitro embryo production and hypo-preservation.However,the addition of ITS in the freezing solution did not significantly improve the programmed freezing effect of bovine in vitro embryos.

Key words: bovine in vitro embryo; insulin-transferrin-sodium selenite(ITS); hypothermic storage; routine programmed freezing

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