Departmental Bulletin Paper Acute testicular atrophy in an active Thoroughbred stallion

Toishi, Yuko  ,  Tsunoda, Nobuo  ,  Okamoto, Minoru  ,  Watanabe, Minami  ,  Katagiri, Seiji  ,  Taya, Kazuyoshi

66 ( 1 )  , pp.43 - 51 , 2018-02
A Thoroughbred stallion was used as an active stallion for ten years, however, the number and motility of sperm dramatically decreased and azoospermia occurred at 16 years of age. Circulating luteinizing hormone (LH) was high at 16 years of age compared to the levels before the occurrence of these symptoms. Testicular endocrine function was examined by human chorionic gonadotropin (hCG) administration. No increase in circulating testosterone was detected at 16 years of age, whereas two peaks of testosterone were observed with hCG treatment at 12 years of age. The number of Leydig cells in the testes increased, but the LH receptor was not detected in Leydig cells. These results demonstrated that acute testicular atrophy occurred within one year.

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