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Biology of Reproduction, Vol 14, 630-631, Copyright © 1976 by Society for the Study of Reproduction

Temporal Distribution of Serum Levels of LH and FSH in Adult Male Golden Hamsters Exposed to Long or Short Days

FRED W. TUREK 1, JANET D. ALVIS 1, JEFFREY A. ELLIOTT 1, , and MICHAEL MENAKER 1

1 Institute of Reproductive Biology, Department of Zoology, University of Texas at Austin, Austin, Texas 78712


Serum levels of LH and FSH were measured at 4-h intervals over a 24-h time period in adult male hamsters either maintained on photostimulatory long days (LD 14:10) or exposed to a nonstimulatory photoperiod (LD 6:18) for 60 days. Regardless of the time of day animals were sacrificed, serum gonadotropin levels were always high in hamsters maintained on LD 14:10 than in animals maintained on LD 6:18.

Note:
ACKNOWLEDGMENTS Radioimmunoassay reagents were provided as gifts from the National Institute of Arthritis and Metabolic Diseases Rat Pituitary Hormone Distribution Program. This investigation was supported by Grants HD-03803 and HD-00268 from the National Institute of Child Health and Human Development. We thank Anne Reynolds for technical assistance.

Submitted on December 16, 1975
Accepted on February 18, 1976






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Copyright © 1976 by the Society for the Study of Reproduction.