{"title":"灰头果蝠精子发生(包括生殖细胞退化)和血浆睾酮浓度的季节变化","authors":"M. A. McGuckin, A. Blackshaw","doi":"10.1071/BI9870211","DOIUrl":null,"url":null,"abstract":"Maximal testicular size of P. poliocephalus occurred during the February–March–April period (autumn breeding season) associated with maximal plasma levels of testosterone (121·5 ± 23·4 nmol/I). Testicular size decreased after the breeding season concomitant with a decrease in plasma testosterone (7·6 ± 1·7 nmol/I). Histologically, regressive changes were observed in the testis after the breeding season including a decrease in seminiferous tubule diameter and a decrease in Leydig cell nuclear diameter. Significant germ cell loss occurred during the breeding season (44%) mainly during the final spermatogonial division and meiosis and increased in regressed testes (69%), being accentuated chiefly at meiosis. All regressed testes showed some sperm production although it was much reduced after the breeding season; however, optimal fertility appears to be restricted to autumn by the large increases in testosterone secretion which only occur at this time.","PeriodicalId":8573,"journal":{"name":"Australian journal of biological sciences","volume":"67 1","pages":"211-220"},"PeriodicalIF":0.0000,"publicationDate":"1987-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"18","resultStr":"{\"title\":\"Seasonal changes in spermatogenesis (including germ cell degeneration) and plasma testosterone concentration in the grey-headed fruit bat, pteropus poliocephalus\",\"authors\":\"M. A. McGuckin, A. Blackshaw\",\"doi\":\"10.1071/BI9870211\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"Maximal testicular size of P. poliocephalus occurred during the February–March–April period (autumn breeding season) associated with maximal plasma levels of testosterone (121·5 ± 23·4 nmol/I). Testicular size decreased after the breeding season concomitant with a decrease in plasma testosterone (7·6 ± 1·7 nmol/I). Histologically, regressive changes were observed in the testis after the breeding season including a decrease in seminiferous tubule diameter and a decrease in Leydig cell nuclear diameter. Significant germ cell loss occurred during the breeding season (44%) mainly during the final spermatogonial division and meiosis and increased in regressed testes (69%), being accentuated chiefly at meiosis. All regressed testes showed some sperm production although it was much reduced after the breeding season; however, optimal fertility appears to be restricted to autumn by the large increases in testosterone secretion which only occur at this time.\",\"PeriodicalId\":8573,\"journal\":{\"name\":\"Australian journal of biological sciences\",\"volume\":\"67 1\",\"pages\":\"211-220\"},\"PeriodicalIF\":0.0000,\"publicationDate\":\"1987-01-01\",\"publicationTypes\":\"Journal Article\",\"fieldsOfStudy\":null,\"isOpenAccess\":false,\"openAccessPdf\":\"\",\"citationCount\":\"18\",\"resultStr\":null,\"platform\":\"Semanticscholar\",\"paperid\":null,\"PeriodicalName\":\"Australian journal of biological sciences\",\"FirstCategoryId\":\"1085\",\"ListUrlMain\":\"https://doi.org/10.1071/BI9870211\",\"RegionNum\":0,\"RegionCategory\":null,\"ArticlePicture\":[],\"TitleCN\":null,\"AbstractTextCN\":null,\"PMCID\":null,\"EPubDate\":\"\",\"PubModel\":\"\",\"JCR\":\"\",\"JCRName\":\"\",\"Score\":null,\"Total\":0}","platform":"Semanticscholar","paperid":null,"PeriodicalName":"Australian journal of biological sciences","FirstCategoryId":"1085","ListUrlMain":"https://doi.org/10.1071/BI9870211","RegionNum":0,"RegionCategory":null,"ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"","JCRName":"","Score":null,"Total":0}
Seasonal changes in spermatogenesis (including germ cell degeneration) and plasma testosterone concentration in the grey-headed fruit bat, pteropus poliocephalus
Maximal testicular size of P. poliocephalus occurred during the February–March–April period (autumn breeding season) associated with maximal plasma levels of testosterone (121·5 ± 23·4 nmol/I). Testicular size decreased after the breeding season concomitant with a decrease in plasma testosterone (7·6 ± 1·7 nmol/I). Histologically, regressive changes were observed in the testis after the breeding season including a decrease in seminiferous tubule diameter and a decrease in Leydig cell nuclear diameter. Significant germ cell loss occurred during the breeding season (44%) mainly during the final spermatogonial division and meiosis and increased in regressed testes (69%), being accentuated chiefly at meiosis. All regressed testes showed some sperm production although it was much reduced after the breeding season; however, optimal fertility appears to be restricted to autumn by the large increases in testosterone secretion which only occur at this time.