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A circannual rhythm in bovine pineal serotonin

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Summary

Bovine pineal serotonin (5-HT) was analyzed at the time of the solstices and equinoxes from December, 1975 until June, 1978. The highest values of 5-HT were detected at the winter solstices and lowest values at the summer solstices of each year examined. The peaks in bovine pineal 5-HT correspond with a lessened fertility in cattle reported during the winter months.

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Author notes

  1. R. Philo

    Present address: Department of Reproductive Medicine and Biology, The University of Texas Medical School at Houston, 77025, Houston, TX

Authors and Affiliations

  1. Department of Anatomy, The University of Texas Health Science Center at San Antonio, 78284, San Antonio, Texas, USA

    R. Philo & R. J. Reiter

Authors
  1. R. Philo
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  2. R. J. Reiter
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Additional information

Supported by NSF grant PCM 77-05734.

The authors wish to thank Roeglein's Provision Company, Beef Processing Division and especially H. Schmidt, Foreman.

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Philo, R., Reiter, R.J. A circannual rhythm in bovine pineal serotonin. Experientia 36, 664–665 (1980). https://doi.org/10.1007/BF01970125

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