A possible role for the thyroid in reproductive inhibition in laboratory populations of the prairie deermouse (Peromyscus maniculatus)

Peebles, E. D.; Painter, Jacob; Bradley, Eric L.

doi:10.1016/0300-9629(84)90063-x

Cited by 9 publications

(1 citation statement)

References 28 publications

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“…Thyroid is a metabolically important gland, which is a suggested to be essential for the normal maintenance of reproductive function, impairment of thyroid activity may be inhibitory to reproduction (Peebles et al, 1984;Jannini et al, 1995). The present study also showed a close relationship between changes in the weight and morphological features of the thyroid and the testicular cycle of S. heathi.…”

Section: Discussionsupporting

confidence: 78%

Changes in the thyroid gland during the reproductive cycle of the male vespertilionid bat, Scotophilus heathi

Krishna

Singh

1998

Rev. Bras. Biol.

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The aim of present study was to compare the changes in thyroid gland with the reproductive cycle of S. heathi. Thyroid showed marked seasonal variation in weight, quantity of colloid and follicular epithelial height, suggesting the thyroid gland to be inactive during quiescence and winter dormancy and active during the time of recrudescence and breeding similarly to the testicular cycle. Plasma thyroxin (T 4 ) concentration showed a significant seasonal change with high concentration during breeding and post-breeding and low concentration during quiescence. However, the T 4 concentration increased from breeding to post-breeding phase, when the testes weight was declining. It is suggested that in S. heathi the positive correlation between thyroid and testicular cycles occurs only during the phases of the reproductive cycle when the body weight and testicular activity are also closely correlated.Key words: Thyroid, thyroxin, testes, bat, body weight, reproduction. RESUMO Mudanças na glândula tireóide durante o ciclo reprodutivo masculino em um morcego vespertilionídeo Scotophilus heathiO objetivo do presente estudo foi comparar as mudanças na glândula tireóide com o ciclo reprodutivo de S. heathi. A tireóide mostrou variação sazonal marcada em peso, quantidade de colóide e altura do epitélio folicular, sugerindo que esta glândula está inativa durante a quiescência e o torpor de inverno e ativa durante o tempo de recrudescência e acasalamento, similarmente ao ciclo testicular. A concentração de tiroxina (T 4 ) do plasma mostrou significantes mudanças sazonais com alta concentração durante o acasalamento e pós-acasalamento e baixa concentração durante a quiescência. Entretanto, a concentração plasmática de T 4 aumentou da fase reprodutiva à pós-reprodutiva, quando o peso dos testículos estava se reduzindo. Sugere-se que, em S. heathi, a estreita correlação entre os ciclos testicular e tireóideo durante algumas fases do ciclo reprodutivo esteja relacionada à sensibilidade aumentada no período reprodutivo e à atividade metabólica.

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Section: Discussionsupporting

confidence: 78%