Hourly fluctuations in the blood levels of melatonin, prolactin, luteinizing hormone, follicle-stimulating hormone, testosterone, tri-iodothyronine, thyroxine and cortisol in rams under artificial photoperiods, and the effects of cranial sympathectomy

MeSH terms

• Animals
• Circadian Rhythm
• Gonadotropins, Pituitary / blood
• Hormones / blood*
• Hydrocortisone / blood
• Light*
• Male
• Melatonin / blood
• Periodicity*
• Pineal Gland / physiology*
• Sheep
• Testosterone / blood
• Thyroxine / blood
• Triiodothyronine / blood