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      Tryptophan Feeding Induces Sensitivity to Short Daylengths in Photoref ractory Hamsters

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          Abstract

          The annual cycle of reproduction in the golden hamster ( Mesocricetus auratus) is characterized by gonadal regression in response to decreasing daylengths in fall. However, hamsters become refractory to the inhibitory effects of short daylengths in late winter when gonadal recrudescense occurs. Our results show that addition of tryptophan to the diet of photorefractory hamsters causes them to respond to short daylengths in a manner similar to photosensitive hamsters in winter. Similar tryptophan treatment did not influence testes weights and fat stores of hamsters maintained on long daylengths.

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          Author and article information

          Journal
          NEN
          Neuroendocrinology
          10.1159/issn.0028-3835
          Neuroendocrinology
          S. Karger AG
          0028-3835
          1423-0194
          1983
          1983
          26 March 2008
          : 36
          : 1
          : 59-63
          Affiliations
          Department of Zoology and Physiology, Louisiana State University, Baton Rouge, La., USA
          Article
          123437 Neuroendocrinology 1983;36:59–63
          10.1159/000123437
          6828209
          © 1983 S. Karger AG, Basel

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          Page count
          Pages: 5
          Categories
          Original Paper

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