Weekly variations in body weight and plasma testosterone concentrations in the captive male possum, Trichosurus vulpecula |
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| Authors: | R T Gemmell G Cepon A Barnes |
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| Affiliation: | 1. University of Torino, Largo Paolo Braccini 2, 10095 Turin, Grugliasco, Italy;2. NOVA Information Management School (NOVA IMS), Universidade Nova de Lisboa, Campus de Campolide, 1070-312 Lisboa, Portugal;3. LASIGE, Departamento de Informàtica, Faculdade de Ciências, Universidade de Lisboa, 1749-016 Lisboa, Portugal;4. Associazione Nazionale Allevatori Bovini Razza Piemontese, Carrù, Italy;1. ICRAF Zambia, Lusaka, Zambia;2. ICRISAT, Bulawayo, Zimbabwe;3. Wageningen University, Wageningen, The Netherlands;4. Matopos Research Institute, Bulawayo, Zimbabwe;5. University of Cape Town, Cape Town, South Africa;6. International Institute of Tropical Agriculture (IITA), Southern Africa Research and Administration Hub (SARAH) Campus, Lusaka, Zambia;1. Department of Environmental Toxicology, The Institute of Environmental and Human Health, Texas Tech University, Lubbock, TX 79409-1163, United States;2. Department of Animal Care Services, Texas Tech University, Lubbock, TX 79409-3132, United States;3. Department of Animal and Food Sciences, Texas Tech University, Lubbock, TX 79409-2141, United States |
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| Abstract: | The possum is a seasonally breeding marsupial which gives birth in Queensland from March through to September. To ascertain whether this seasonality in breeding is manifest in the male reproductive system, body weight and plasma testosterone concentrations were examined in five possums. Plasma testosterone concentrations fluctuated throughout the year and a seasonal cycle was observed, with a peak in testosterone concentration in March and a nadir in September. Body weights fluctuated in a similar manner. Statistical analysis suggested that the annual plasma testosterone profile correlated well with the rate of change of daylength. |
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