Thyroid and beta-cells follicular hormonogenesis of the pancreas in calves and cows

Thyroxine, triiodothyronine and insulin and their content formation in the calves blood at early postnatal ontogenesis formation depends on the age, feeding manner and also on the air temperature connected with the conditions of keeping (indoors or outdoors). These hormone concentration in cows´ blood is determined by physiological condition of animals, related to the lactation intensity, duration of the lactation period, launching dates and the level feeding.