Comparison of serum hormone levels of captive and free-living maned wolves Chrysocyon brachyurus
Braz. j. med. biol. res
;
41(2): 176-179, Feb. 2008. graf
Article
in English
| LILACS
| ID: lil-474766
ABSTRACT
Serum hormone levels were compared between captive and free-living maned wolves and seasonal variations of sex hormones were studied. Blood samples were collected from 16 male and 26 female adult animals from Brazilian zoos, and from 30 male and 24 female free-living adults to determine serum progesterone and testosterone by radioimmunoassay. Serum testosterone concentrations varied (P < 0.05) across seasons for 16 captive males, being higher in autumn (2184.7 ± 355.1 pg/mL) than in summer (1080.7 ± 205.4 pg/mL), winter (1270.1 ± 276.6 pg/mL) and spring (963.9 ± 248.1 pg/mL), although they did not differ between summer, winter and spring. Testosterone concentration of 30 free-living males differed (P < 0.05) between autumn (824.1 ± 512.2 pg/mL), winter (14.4 ± 8.0 pg/mL) and spring (151.9 ± 90.5 pg/mL). Comparison between captive and free-living animals showed no difference in autumn (P > 0.05). Sixteen captive males showed higher testosterone concentration during winter and spring compared with 30 free-living animals (P < 0.05). Progesterone concentration varied among seasons in 26 captive females (P < 0.05), being higher in autumn (15.3 ± 3.1 ng/mL) than in summer (6.6 ± 1.5 ng/mL), winter (5.3 ± 3.1 ng/mL) and spring (4.3 ± 0.7 ng/mL). Progesterone concentration of 24 free-living females varied between autumn (17.1 ± 6.0 ng/mL) and winter (1.7 ± 0.3 ng/mL) (P < 0.05), but we could not obtain data for spring or summer. No difference in progesterone levels was observed between captive and free-living females in autumn and winter.
Full text:
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Index:
LILACS (Americas)
Main subject:
Progesterone
/
Testosterone
/
Wolves
/
Animals, Zoo
Limits:
Animals
Language:
English
Journal:
Braz. j. med. biol. res
Journal subject:
Biology
/
Medicine
Year:
2008
Type:
Article
Affiliation country:
Brazil
Institution/Affiliation country:
Bet Laboratories do Brasil/BR
/
Centro Nacional de Pesquisa para a Conservação dos Predadores Naturais/BR
/
Centro de Pesquisa Agroflorestal/BR
/
Fundação Zoobotânica de Belo Horizonte/BR
/
Fundo para a Conservação da Onça-Pintada/BR
/
Instituto para Conservação dos Carnívoros Neotropicais/BR
/
Parque Natural da Companhia Brasileira de Mineração e Metalurgia/BR
/
Universidade de São Paulo/BR
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