Titlebook: Environmental Endocrinology; Proceedings of an In Ivan Assenmacher (Professor of Physiology),Donald Conference proceedings 1978 Springer-V

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Reptilian Reproductive Cycles and Environmental Regulatorsroughout the year. Thus, CHURCH (196 2) has observed continuous breeding in several species of geckos in Java; and in Malaysia, BERRY and LIM (1967) have noted females of the aquatic, ovoviviparous snake, ., with large ovarian follicles and oviducal eggs during every month. Even in the tropics, howe

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Regulation of Reproductive Cycles of Tropical Spotted Munia and Weaverbirdnasi, 25°18′ N, 83°01′E) the gonads of the Spotted munia begin to develop immediately after the summer solstice, are fully active upto October to November and collapse before the winter solstice (Fig. 1). Gonads of the weaverbird begin to development earlier, in March to April, attain maximal size i

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Breeding Cycles in Three Species of African Ungulatese research in this important field in Africa. Yet there has been no great increase in knowledge since then. Moreover, much of the endocrinologic research has been of an indirect nature, and hormone levels are only infrequently determined. This is first because research is carried out under difficult

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Annual Cyclic Variations in Prolactin in Sheepseasonal variations in reproductive activity occur in both males and females. Gonadotropic hormones are involved in regulation of male and female reproductive processes; thus, it is possible to observe seasonal variations in their secretion by studying the plasma levels of each of them. Variations i

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Seasonal Changes of the Testicular and Thyroid Functions in the Badger, , L.evels present marked seasonal variations (MAUREL et al., 19 77). At the end of summer and in autumn, plasma testosterone concentrations are low, while the plasma thyroxine level is high. The resumption of testicular activity takes place in December at the beginning of the phase of hypoactivity of th