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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Journal ID (publisher-id): NEN

Journal ID (nlm-ta): Neuroendocrinology

Journal ID (doi): 10.1159/issn.0028-3835

Title: Neuroendocrinology

Publisher: S. Karger AG

ISSN (Print): 0028-3835

ISSN (Electronic): 1423-0194

Publication date Subscription-year: 1983

Publication date (Print): 1983

Publication date (Electronic): 26 March 2008

Volume: 36

Issue: 1

Pages: 59-63

Affiliations

Department of Zoology and Physiology, Louisiana State University, Baton Rouge, La., USA

Article

Publisher ID: 123437 Other ID: Neuroendocrinology 1983;36:59–63

DOI: 10.1159/000123437

PubMed ID: 6828209

SO-VID: eb24e16f-caaa-4cb6-9612-17eb7a5b1553

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Copyright: All rights reserved. No part of this publication may be translated into other languages, reproduced or utilized in any form or by any means, electronic or mechanical, including photocopying, recording, microcopying, or by any information storage and retrieval system, without permission in writing from the publisher. Drug Dosage: The authors and the publisher have exerted every effort to ensure that drug selection and dosage set forth in this text are in accord with current recommendations and practice at the time of publication. However, in view of ongoing research, changes in government regulations, and the constant flow of information relating to drug therapy and drug reactions, the reader is urged to check the package insert for each drug for any changes in indications and dosage and for added warnings and precautions. This is particularly important when the recommended agent is a new and/or infrequently employed drug. Disclaimer: The statements, opinions and data contained in this publication are solely those of the individual authors and contributors and not of the publishers and the editor(s). The appearance of advertisements or/and product references in the publication is not a warranty, endorsement, or approval of the products or services advertised or of their effectiveness, quality or safety. The publisher and the editor(s) disclaim responsibility for any injury to persons or property resulting from any ideas, methods, instructions or products referred to in the content or advertisements.

History

Date received : 22 March 1982

Date accepted : 09 August 1982

Page count

Pages: 5

Tryptophan Feeding Induces Sensitivity to Short Daylengths in Photoref ractory Hamsters

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Karger: Endocrinology

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