RESUMEN
Experiments with calves of initial weight of about 178 kg revealed that salimycin given with the feed at the rate of 0.5 mg/kg for 24 hours in the course of 269 days, and monensin used for comparison at 0.7 mg/kg for 24 hours led to the increase in the weight gain by 4.3 and 6 per cent, respectively. An increase in the conversion of forage was also established--6.3 and 9.5 per cent, respectively. Up to the sixth month of age the rise of the weight gain (as against the negative control group) with the calves treated with salimycin (11.7 per cent) was higher than that with calves that were given monensin (9.9 per cent). The combined application of salimycin (0.5 mg/kg for 24 h) and flavophospholipol (0.1 mg/kg for 24 h) led to the slight enhancement of the nutritive effect: with regard to the weight gain--by 1.7 per cent, and with regard to the conversion of forage--by 2.8 per cent.