Acta Veterinaria et Zootechnica Sinica ›› 2021, Vol. 52 ›› Issue (8): 2190-2199.doi: 10.11843/j.issn.0366-6964.2021.08.012

• ANIMAL BIOTECHNOLOGY AND REPRODUCTION • Previous Articles     Next Articles

Effects of High Pressure Homogeneous Egg Yolk on Apoptosis of Boar Sperm Cryopreservation

WANG Junyue1,2, DAI Jianjun1,2, ZHANG Shushan1,2, SUN Lingwei1,2, WU Caifeng1,2, ZHANG Defu1,2*   

  1. 1. Division of Animal Genetic Engineering, Shanghai Municipal Key Laboratory of Agri-genetics and Breeding, Institute of Animal Science and Veterinary Medicine, Shanghai Academy of Agricultural Sciences, Shanghai 201106, China;
    2. National Demonstration Center for Experimental Fisheries Science Education, Shanghai Ocean University, Shanghai 201306, China
  • Received:2021-01-04 Online:2021-08-23 Published:2021-08-21

Abstract: The aim of this study was to explore the effect of egg yolk (EY) treated by high pressure homogenization on the freezing effect of boar semen. Semen were collected from 5 healthy, mature Duroc boars. The ordinary egg yolk+Tris-citric acid-glucose (TCG) diluent was the control group, and the high pressure homogenized egg yolk+Tris-citric acid-glucose (TCG) diluent was the treatment group. Frozen semen samples were thawed, and the sperm motility, DNA integrity, changes in mitochondrial membrane potential, number of apoptotic cells, Caspases activity were detected. The expression of apoptosis-related genes mRNA was measured by qRT-PCR, and extracting raw data and performing data were analyzed. The results showed that, after the high pressure homogenization treatment, the vitality, motility and acrosomal integrity of pig sperms after freezing were significantly higher than those of the control group (P<0.05), which were 87.64%, 87.14% and 66.61%, respectively, higher than those of the control group for 12.58%, 5.82% and 12.48%; mitochondrial membrane potential and DNA integrity were significantly higher than those of the control group (P<0.05), which were 0.74 and 61.76%; the level of sperm apoptosis was significantly reduced (P<0.05), which was 37.74%; the Caspase-3, Caspase-8 and Caspase-9 activities of the experimental group were 17.15, 11.19 and 15.18, which were reduced by 6.17, 2.18 and 3.51 compared with the control group (P<0.05); the expression of Bax, TNF-α, and Caspase-9 genes in the control group were significantly higher than those in the treatment group (P<0.05), and the Bcl-2 gene expression was lower than that in the treatment group (P>0.05). In summary, high pressure homogenous egg yolk can improve the quality of pig sperms after freezing, promote the integrity of mitochondrial function, reduce the level of early sperm cell apoptosis and intracellular Caspase activity, and reduce the mRNA expression of apoptosis-related genes.

Key words: high pressure homogenization, egg yolk, semen cryopreservation, cell apoptosis

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