The effect of thyme extract on the growth rate of black and motley calves

The aim of the study was to establish optimal dose of administration thyme extract affecting the growth rate of calves of black and motley breed. The research objectives were to study the growth rate of calves at different doses of thyme extract. The objects of the study were black and motley calves aged 14 to 28 days. The experiment was carried out on 36 animals weighing 40-42 kg. The diet of calves of control group (n=6) consisted of unskimmed milk, feed and hay. Thus the diet of the calves of experimental groups (n=6 in each) daily included thyme extract in the amount of: in the first - 1 g/a head. (0.025 mg / kg); in the second - 3 g/a head (0.075 mg/kg); in the third - 5 g/a head (0.125 mg/kg); in the fourth - 7 g/a head (0.175 mg/kg); in the fifth - 9 g/a head (0.225 mg/kg). Control group received the main diet. To determine the growth rate of calves, they were weighed at 14 and 28 days of age. Absolute and relative growth was determined on the basis of live weight of calves...