The effect of Trypanosoma congolense infection on the oestrous cycle of the goat |
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| Authors: | C A Llewelyn A G Luckins C D Munro J Perrie |
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| Affiliation: | 2. Department of Animal Science, University of Minnesota, St. Paul 55108;3. Department of Large Animal Clinical Sciences;4. Department of Animal Sciences, University of Florida, Gainesville 32608;1. Universidade Federal Fluminense, Av. Vital Brazil Filho, 64, CEP 24230-340, Niterói, RJ, Brazil;2. Escola de Ciências da Saúde, Universidade do Grande Rio, Rua Prof. José de Souza Herdy, 1160, CEP 25071-202, Duque de Caxias, RJ, Brazil;3. Departamento de Morfologia e Histologia, Instituto de Ciências Biológicas, Universidade Federal de Juiz de Fora, Rua José Lourenço Kelmer, s/n, CEP 36036-900, Juiz de Fora, MG, Brazil;4. Embrapa Gado de Leite, Av. Eugênio do Nascimento, 610, CEP 36038-330, Juiz de Fora, MG, Brazil;5. Embrapa Caprinos e Ovinos, Estrada Sobral/Groaíras, km 04, CP 145, CEP 62010-970, Sobral, CE, Brazil;1. Department of Ophthalmology, University of Texas Southwestern Medical Center, 5323 Harry Hines Boulevard, Dallas, TX, USA;2. Department of Biochemistry, University of Texas Southwestern Medical Center, 5323 Harry Hines Boulevard, Dallas, TX, USA;3. Department of Molecular Biology, University of Texas Southwestern Medical Center, 5323 Harry Hines Boulevard, Dallas, TX, USA;4. Department of Pharmacology, University of Texas Southwestern Medical Center, 5323 Harry Hines Boulevard, Dallas, TX, USA;1. Chair of Food Safety, Faculty of Veterinary Medicine, Ludwig-Maximilians-University Munich, Schönleutnerstraße 8, D-85764 Oberschleißheim, Germany;2. Department of Research and Documentation, Bavarian Forest National Park, Freyunger Straße 2, D-94481 Grafenau, Germany;3. Chair of Hygiene and Technology of Milk, Faculty of Veterinary Medicine, Ludwig-Maximilians-Universität Munich, Schönleutnerstraße 8, D-85764 Oberschleißheim, Germany |
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| Abstract: | The oestrous cycle of four goats was monitored during the course of an infection with T. congolense maintained with sub-curative doses of diminazene aceturate. Four uninfected control goats also given diminazene aceturate acted as controls. Cyclical ovarian function was monitored by daily determination of plasma progesterone concentrations. According to plasma progesterone profiles, control goats continued to cycle throughout the experiment, completing 24 cycles in total. Mean (± SEM) cycle length in the control of goats was 21·1 ± 0·8 days, with mean plateau progesterone concentrations during the luteal phase averaging 8·95 ± 0·28 ng/ml.Three goats developed persistent corpora lutea following T. congolense infection. In two of these goats the luteal phase was extended for 48 and 94 days respectively, and the presence of corpora lutea on the ovaries confirmed at autopsy. In the third goat, the persistent corpus luteum regressed spontaneously after an extended cycle of 53 days. After a short 6 day cycle this goat completed 2 oestrous cycles of normal length. Progresterone concentrations were reduced by approximately half during the period of extended luteal function in the 3 infected goats with persistent corpora lutea. The fourth infected goat continued to cycle throughout the experiment, but also exhibited reduced progesterone concentrations in the cycle following infection. |
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