A method for improving the reproductive performance of first-calf heifers using a complex mineraland vitamin feed additive is presented to the production. The animals of the control group were fed according to the main diet accepted in the farm and mineral matters. The animals from group I were fed the main ration with 120 g of the complex mineraland vitamin feed additiv per head acco... https://otsportszones.shop/product-category/nba-sets/