Elena Şogorescu

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INFLUENCE OF PHOTOPERIOD TREATMENTS ON PATTERN OF TESTOSTERONE SECRETION AND TESTICULAR VOLUME AT CARPATINA BREED

Elena Şogorescu, Stela Zamfirescu, Andreea Hortanse Anghel, Dorina Nadolu, N. Dobrin

Abstract
Photoperiod is a major environmental factor of regulation of testosterone secretion and testicular volume. The bucks of the control batch (n=10) remained in a open shelters under natural day light and ambient temperature while the experimental batch (n=10) were placed in light-proof shelters and were exposed to alternations of 3 months of long days and 3 months of natural photoperiod. In light-treated batch, the photoperiodic changes by long days inhibited the testosterone secretion. Testicular volume was higher during normal days than long days although the amplitude of the variations was reduced compared to control groups. In photoperiod treated batch, testosterone secretion increased after 2 weeks of exposure to normal days and decreased within a 4 weeks after the beginning of exposure to long days.

Key words: testosterone, testicular volume, Carpatina bucks, photoperiod treatments