A circannual rhythm in bovine pineal serotonin |
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| Authors: | R Philo R J Reiter |
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| Institution: | (1) Department of Anatomy, The University of Texas Health Science Center at San Antonio, 78284 San Antonio, Texas, USA;(2) Present address: Department of Reproductive Medicine and Biology, The University of Texas Medical School at Houston, 77025 Houston, TX |
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| Abstract: | 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.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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