Comparison of serum hormone levels of captive and free-living maned wolves Chrysocyon brachyurus

Comparison of serum hormone levels of captive and free-living maned wolves Chrysocyon brachyurus

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 proges...

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Bibliographic Details
Published in:Brazilian journal of medical and biological research Vol. 41; no. 2; pp. 176 - 179
Main Authors: Maia, O B, Jácomo, A T A, Bringel, B A, Kashivakura, C K, Oliveira, C A, Teodoro, L O F, Silveira, L, Teixeira da Costa, M E L, Malta, M C C, Furtado, M M, Torres, N M, Mattos, P S R, Viau, P, Lima, T F G, Morato, R G
Format: Journal Article
Language:English
Published: Brazil Associação Brasileira de Divulgação Científica 01-02-2008
Subjects:
Animals
Animals, Zoo - blood
BIOLOGY
Female
Male
Maned wolf Chrysocyon brachyurus
MEDICINE, RESEARCH & EXPERIMENTAL
Progesterone
Progesterone - blood
Radioimmunoassay
Reproduction
Seasons
Testosterone
Testosterone - blood
Wolves - blood
Testosterone
Reproduction
Progesterone
Maned wolf Chrysocyon brachyurus
Radioimmunoassay
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Summary: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.
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ISSN:0100-879X
1414-431X
1414-431X
0100-879X
DOI:10.1590/S0100-879X2008000200015