Elucidation of male sterility occurred in cattle-yak hybrid and production of calf from the hybrid male in Mongolia

2016 Fiscal Year Final Research Report

• Project/Area Number: 25304039
• Research Category: Grant-in-Aid for Scientific Research (B)
• Allocation Type: Partial Multi-year Fund
• Section: 海外学術
• Research Field: Animal production science
• Research Institution: The University of Tokushima (2016); Yamaguchi University (2013-2015)
• Principal Investigator: Otoi Takeshige 徳島大学, 大学院生物資源産業学研究部, 教授 (30311814)
• Co-Investigator(Kenkyū-buntansha): 佐藤 陽子 東亜大学, 医療学部, 教授 (50398963)
• Project Period (FY): 2013-04-01 – 2017-03-31
• Keywords: 繁殖 / 精子形成 / 不妊 / 交雑種 / ヤク

Outline of Final Research Achievements

In Mongolia, Yak (Bos grunniens) live in the alpine area, and their products are indispensable resources for local people. Crossbreeding with cattle (Bos taurus) gives dominant trait. However, male hybrid shows infertility because of spermatogenetic arrest (male sterility). This study investigated spermatogenesis of cattle-yak hybrid and evaluated the effects of detergent Orvus ES Paste (OEP) on the post-thaw motility and viability of epididymal and ejaculated yak spermatozoa. Our findings indicate that the male sterility results from low ability of cell death but not from cell growth in the spermatid. Moreover, the addition of 0.75% OEP was effective for the preservation of yak spermatozoa.

Free Research Field

生殖工学