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Plasma and testicular testosterone levels, volume density and number of Leydig cells and spermatogenic efficiency of rabbits
Castro, A. C. S; Berndtson, W. E; Cardoso, F. M.
  • Castro, A. C. S; Universidade Federal de Minas Gerais. Instituto de Ciências Biológicas. Departamento de Morfologia. Belo Horizonte. BR
  • Berndtson, W. E; University of New Hampshire. Department of Animal and Nutritional Sciences. Durham. US
  • Cardoso, F. M; Pontifícia Universidade Católica de Minas Gerais. Departamento de Medicina Veterinária. Betim. BR
Braz. j. med. biol. res ; 35(4): 493-498, Apr. 2002. tab
Article in English | LILACS | ID: lil-309205
RESUMO
Plasma and tissue testosterone concentrations were determined by radioimmunoassay in 12 eight-month-old sexually mature New Zealand White rabbits and evaluated for possible associations with spermatogenic efficiency as well as with volume density and number of Leydig cells. Testicular tissue was processed histologically and histometry was performed in order to quantify germ cells, Sertoli cells and Leydig cells. Spermatogenic efficiency, reported as the ratios among germ cells (spermatogonia, primary spermatocytes and round spermatids) and by the ratio of germ cells to Sertoli cells, was not associated with testosterone levels. However, Leydig cell parameters such as number of Leydig cells per gram of testis, total number of Leydig cells per testis and percent cell volume of Leydig cell nuclei were correlated significantly with testosterone levels. The statistically significant correlation (r = 0.82, P<0.05) observed between testosterone levels and the number of Leydig cells per gram of testis suggests that, in the rabbit, the latter parameter can serve as a criterion for monitoring testosterone levels in this species under normal conditions
Subject(s)
Full text: Available Index: LILACS (Americas) Main subject: Spermatogenesis / Testis / Testosterone / Radioimmunoassay / Leydig Cells Limits: Animals / Humans / Male Language: English Journal: Braz. j. med. biol. res Journal subject: Biology / Medicine Year: 2002 Type: Article Affiliation country: Brazil / United States Institution/Affiliation country: Pontifícia Universidade Católica de Minas Gerais/BR / Universidade Federal de Minas Gerais/BR / University of New Hampshire/US

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Full text: Available Index: LILACS (Americas) Main subject: Spermatogenesis / Testis / Testosterone / Radioimmunoassay / Leydig Cells Limits: Animals / Humans / Male Language: English Journal: Braz. j. med. biol. res Journal subject: Biology / Medicine Year: 2002 Type: Article Affiliation country: Brazil / United States Institution/Affiliation country: Pontifícia Universidade Católica de Minas Gerais/BR / Universidade Federal de Minas Gerais/BR / University of New Hampshire/US