UN SDG
Livestock Studies 1998, Vol 38, Num, 1     (Pages: 069-078)
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Effect of photoperiodism on fertility in domestic Anlmals

Mesut ÇEVİK 1 ,Nafiz YURDAYDIN 2

1 Aras. Gör., A Ü. Veteriner Fak., Dölerme ve Sun' i Tohumlama A. B. D., ANKARA
2 Doç. Dr., A Ü. Vet. Fak. Dölerme ve Sun'i Toh. Ana Bilim Dalı, ANKARA - n seasonaly breeding mammals that use changes in the photoperiod to time their reproductive cycles, temporal signals to the reproductive system are controlled by the daily rhythm in melatonin production. There is a daily rhythm in the production of the pineal hormone melatonin in all mammalian species. Production is stimulated by darkness and inhibited by light. This provides a signal reflecting the changing environmental lighting cycle.

Melatonin has an effect on the development of sex and reproduction. Animals that are photoperiodic administration of melatonin allows the extension of the reproductive season. Melatonin effects reproductive physiology. However, its mechanism of action, target cells and decromposition have not been completely elucidated.

The use of exogenous melatonin to manipulate reproduction in various mammals has recently been studied extensively. Keywords :