Determination of vitamin A, E, D levels with melatonin hormones according to seasonal changes and milking periods in different animals

Hormones and vitamins are extremely important ingredients for healthy growth, development and regularity of events in metabolism. In our study, melatonin hormone and vitamins A, E, D3 were analyzed. The material of our work consisted of 20 Simental Breed Cows, 20 Akkaraman Breeds Sheep and 20 Native Breeder Goat. The highest value of cow milk melatonin levels was obtained on winter morning (evening milk). In general, melatonin levels in morning samples (evening milk) were higher than in evening samples (day milk). Seasonal change in average melatonin in the goats was statistically significant (p <0.001). The highest melatonin value was obtained on summer morning (evening milk). Seasonal variation of mean melatonin demonstrate in sheep (p <0.001). The highest value of melatonin was obtained in the spring morning (evening milk). Vitamin results; retinol highest summer; α-tocopherol highest winter; the highest value of vitamin D3 is found in cows. The vitamin results spring values in goats were found to be higher than summer values in all three vitamins. Vitamin results; retinol was higher in spring than summer; α-tocopherol was higher in spring; The vitamin D3 value was found to be higher in summer in sheep. In our work, we took into consideration the night, day and seasonal factors. In addition, levels of hormones and vitamins varied according to species, seasons and milking time. Keywords: Cow, Day, Goat, Light, Melatonin, Night, Sheep, Vitamin