ACTA VETERINARIA ET ZOOTECHNICA SINICA ›› 2014, Vol. 45 ›› Issue (9): 1424-1431.doi: 10.11843/j.issn.0366-6964.2014.09.007

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Effects of C-type Natriuretic Peptide Pretreatment on in vitro Maturation of Bovine Oocyte

ZHANG Chun-qiang,OUYANG Xiao-qing,ZHANG Tong,LI Rui-lan,FAN Xiao-mei,ZHANG Jia-xin*   

  1. (Key Laboratory of Animal Genetics,Breeding and Reproduction,College of Animal Science,Inner Mongolia Agricultural University,Hohhot 010018,China)
  • Received:2014-03-13 Online:2014-09-23 Published:2014-09-23

Abstract:

To study the in vitro maturation (IVM) of bovine oocyte pretreated with C-type natriuretic peptide (CNP).Compared with the conventional 24 h IVM culture,the effect of bovine oocytes pre-treated with CNP for 6 h following 28 h IVM culture (CNP pre-treated group) were studied.The results showed that the maturation of bovine oocyte in CNP pre-treated group were significantly improved,and the blastocyst rate and the cell number of blastocyst were significantly higher than those of the control group((51.55%±2.50%),(156.2±11.0)vs.(28.13%±3.80%),(116.3±19.0),P<0.05) after in vitro fertilization (IVF).The distribution of mitochondria ranged from peripheral distribution in unmatured oocyte to homogenous distribution throughout the cytoplasm in matured oocytes,while semi-peripheral distribution observed in the oocytes pretreated with CNP for 6 h,but then became homogenous distribution followed 28 h maturation culture.The mtDNA copy number of matured oocyte in CNP pre-treated group were (510 078.4±28 906.0),which was significantly higher than that of control group((416 558.5±51 743.0),P<0.05).The results indicated that the quality of bovine oocytes in vitro maturation pre-treated for 6 h with CNP could be improved effectively.

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