Effect of Addition Vitamin C and Zinc Chloride in Vitrification Medium on Viability, in vitro Maturation and Ultrastructure Changes of Vitrified Immature Bovine Oocytes

Document Type : Original Article

Authors

1 Department of Animal Production, Faculty of Agriculture, Mansoura University, Mansoura, 35516, Egypt.

2 Evaluation of Natural Resources Department, Environmental Studies and Research Institute, University of El Sadat City, Egypt. Clinical Nutrition Department, College of Applied Medical Sciences, Jazan University, K.S.A.

3 Animal Production Research Institute, Agricultural Research Center, Ministry of Agriculture, Doki, Giza, Egypt.

Abstract

This study aimed to evaluate the impact of adding vitamin C and zinc chloride to vitrification medium on viability in vitro maturation and ultrastructure changes of vitrified immature Baladi cow oocytes. Compact cumulus oocytes (COCs) (n=1370) were obtained from slaughtered bovine ovaries. Then the morphology of oocytes was examined using a stereomicroscope.  Staining with trypan, the in vitro maturation and ultrastructural changes were studied. The results revealed significant (P<0.05) increase of total and normal survival rate of bovine oocytes vitrified with zinc chloride (90.28 and 81.11%) than in vitamin C media (82.5 and 65.65%) or control medium (74.44 and 54.72%). Recovery rate of abnormal bovine oocytes showed significantly an opposite trend (9.17 vs. 16.94 and 19.72%). Proportion of oocytes with viable cytoplasm and viable cumulus (VOVC) was increased significantly (93.75%, P<0.05) in fresh (control) than in medium supplemented with vitamin C and untreated medium (74.55 and 68.63%), respectively. There were non-significant differences among zinc chloride, control and vitamin C media in oocytes with vaible cytoplasm and unvaiable cumulus (VOUC). Supplementation of the vitrification medium with zinc chloride and vitamin C significantly (P<0.05) improved maturation rates (MII) of recovered cumulus oocyte complexes (COCs) than medium without supplementation. The percentage of ultrastructural alterations in most organelles bovine oocytes significantly (P<0.05) increased in oocytes vitrified without supplementation followed by vitamin C, then zinc chloride medium. Conclusion, supplementation of vitamin C or zinc chloride to the vitrification medium improved survival rate, morphologically and ultrastructural, as well as maturation rate of bovine oocytes

Keywords

Journal of Animal and Poultry Production
Volume 11, Issue 11
November 2020
Pages 441-447

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