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Registro Completo |
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Biblioteca(s): |
Embrapa Pantanal. |
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Data corrente: |
26/08/1997 |
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Data da última atualização: |
05/04/2017 |
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Autoria: |
BOURNE, A. R.; TAYLOR, J. L.; WATSON, T. G. |
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Título: |
Annual cycles of plasma and testicular androgens in the lizard Tiliqua (Trachydosaurus) rugosa. |
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Ano de publicação: |
1986 |
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Fonte/Imprenta: |
General and Comparative Endocrinology, v.61, p.278-286, 1986. |
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Idioma: |
Inglês |
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Conteúdo: |
Androgenpeosuction during the annual reproductive cycle was investigated in the male scincid lizard Tiliqua (Trachydosaurus) rugosa. Concentrations of testosterone and epitestosterone were measured in plasma and testis (incubated and monincubated) using radioimmunoassay. Morphological and histological techniques were used to determine the anatomical changes in the testis. Mating behavior was observed during spring, and sperm were most numerous in the testis at this time. Histological evidence and changes in testicular weight indicated that spermatogenesis begins in autum and culminates in spring. Testicular regression occurred soon after mating. Plasma concentrations of both androgens were maximal during spring and minimal during summer. The maximal concentrations were approximately 500 and 150 nmol/liter (epitestosterone and testosterone, respectively). The minimal plasma concentrations were 250 and 15 mnol/liter, respectively. Plasma and testicular androgen cycles followed a parten siamilar to that of the spermatogenetic cycle, suggesting the possible involvement of one or both of these androgens in the control of spermatogenesis and mating behavior in these lizards. |
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Palavras-Chave: |
Hormone; Lizard; Reptile; Tiliqua (Trachydosaurus) rugosa. |
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Thesagro: |
Hormônio; Lagarto; Plasma; Reprodução; Réptil; Testosterona. |
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Thesaurus Nal: |
reproduction; testosterone. |
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Categoria do assunto: |
-- |
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Marc: |
LEADER 01959naa a2200289 a 4500
001 1791520
005 2017-04-05
008 1986 bl --- 0-- u #d
100 1 $aBOURNE, A. R.
245 $aAnnual cycles of plasma and testicular androgens in the lizard Tiliqua (Trachydosaurus) rugosa.
260 $c1986
520 $aAndrogenpeosuction during the annual reproductive cycle was investigated in the male scincid lizard Tiliqua (Trachydosaurus) rugosa. Concentrations of testosterone and epitestosterone were measured in plasma and testis (incubated and monincubated) using radioimmunoassay. Morphological and histological techniques were used to determine the anatomical changes in the testis. Mating behavior was observed during spring, and sperm were most numerous in the testis at this time. Histological evidence and changes in testicular weight indicated that spermatogenesis begins in autum and culminates in spring. Testicular regression occurred soon after mating. Plasma concentrations of both androgens were maximal during spring and minimal during summer. The maximal concentrations were approximately 500 and 150 nmol/liter (epitestosterone and testosterone, respectively). The minimal plasma concentrations were 250 and 15 mnol/liter, respectively. Plasma and testicular androgen cycles followed a parten siamilar to that of the spermatogenetic cycle, suggesting the possible involvement of one or both of these androgens in the control of spermatogenesis and mating behavior in these lizards.
650 $areproduction
650 $atestosterone
650 $aHormônio
650 $aLagarto
650 $aPlasma
650 $aReprodução
650 $aRéptil
650 $aTestosterona
653 $aHormone
653 $aLizard
653 $aReptile
653 $aTiliqua (Trachydosaurus) rugosa
700 1 $aTAYLOR, J. L.
700 1 $aWATSON, T. G.
773 $tGeneral and Comparative Endocrinology$gv.61, p.278-286, 1986.
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Registro original: |
Embrapa Pantanal (CPAP) |
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