Data/hora: 03/06/2024 12:02:31

Biblioteca(s): | Embrapa Pantanal.
Data corrente: | 19/07/1996
Data da última atualização: | 04/04/2017
Autoria: | LANCE, V. A.; ELSEY, R. M.
Título: | Stress induced suppression of testosterone secretion in male alligators.
Ano de publicação: | 1986
Fonte/Imprenta: | Journal Experimental Zoology, v.239, p.241-246, 1986.
Idioma: | Inglês
Conteúdo: | In order to test the effect of acute stress on gonadal hormone secretion in reptiles, six mature male alligators were captured and blood sample was taken within 5 min of capture. Additional blood samples were taken at timed intervals for up to 41 hr, and plasma testosterone and corticosterone were measured by radioimmunoassay. Plasma testosterone declined to 50% of the initial value by 4 hr and dropped to less than 10% of initial by 24 hr. Plasma corticosterone increased during the first 12 hr, declined at 24 hr, and rose again at 40 hr. Blood samples from male alligators collected in North and South Carolina, south Florida and in south Louisiana in two consecutive breeding seasons were also assayed for testosterone and corticosterone. In these populations thre were significant differences in mean plasma testosterone and corticosterone levels. Elevated corticosterone levels were consitently seen in alligators caught in traps and from which a blood sample was taken several hours later. Plasma testosterone, althought consistently lower in traped alligators, did not show a negative correlation with plasma costicosterone. Farm-reared alligators bled once, released and bled again at 24 also showed a highly significant suppression of testosterone secretion. These results demostrate that stress has a rapid and dramatic effect on testicular steroid secretion in both farm-reared and wild alligators.
Palavras-Chave: | Alligator.
Thesagro: | Animal Selvagem; Reprodução.
Thesaurus Nal: | reproduction; wildlife.
Categoria do assunto: | --
Registro original: | Embrapa Pantanal (CPAP)
Exemplares: | CPAP - (32765-1) - ADD - SP - PP - SP14905 -  - 14905 - DIS