Metabolic maintenance of estrus cycles formation in animals at puberty

New data reflecting physiological mechanisms of the estrous cycle formation are obtained through studying biochemical content assay in blood serum in pubertal heifers. In dairy heifers aged 12-13 and 15-17 months during normal estrous cycles before fertilization, crude protein in blood reaches average values for adult cows, albumins and globulins content is raised to baseline reference values for cows.