Reproductive indicators of first-calf heifers when using a complex mineral-vitamin feed additive

Abstract

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 according to recipe No.1. The animals from group II received the main ration with 120 g of the feed additive per head according to recipe No.2. The cow mating index of the first heifers of the control group is 2.1, which is0.48 and 0.60 times higher than in groups I and II. The highest rate of fecundation showed the cows of the experimental group II. It made up 63%, 7% higher than the experimental group I(56 %) and 18% higher than the control group (45 %). After the second fecundation, the conception rate in group II was 37%, which is 18% higher than in the control group and 7% higher than in animalsof group I. The calf crop in all groups was 100%.