Eight complete cereal-soybean diets were used in the experiment, 4 for young growing pigs (18.8-41.6 kg of body weight) and 4 for fatteners at the first stage of fattening (41.6-77.5 kg of body weight). The composition of diets 1-4 for both age groups was as follows: (1) control – without experimental additives, (2) experimental –with herbal preparation Digestarom, (3) experimental – with salinomycin, (4) experimental – with Digestarom and salinomycin. Diets 2 and 4 for both age groups contained 0.03% of Digestarom. Salinomycin was added to diets 3 and 4 in the proportion of 50 mg per kg of feed for young growing pigs, and 40 mg per kg of feed for fatteners. The diets were made using premixes “Polimiks P” and “Polimiks WT”, containing Digestarom and/or salinomycin, mineral-vitamin supplements and amino-acids. The experiment was performed on 32 crossbred weaners (♀Polish Landrace × ♂Duroc) aged 9 weeks, with initial body weights of 18.8 kg. The animals were selected by the analogue method and divided into 4 feeding groups. They were kept in pairs (castrated male and female), in flat-deck boxes at the first stage of the experiment (4 weeks), and in standard litter boxes at the second stage of the experiment (5 weeks). The level of feed consumption was monitored daily. Very good production results were obtained over the entire experimental period. Differentiated feeding did not affect the growth and feed/gain ratios of pigs. Herbal preparation Digestarom had a significant positive effect on feed consumption, whereas salinomycin reduced its level.

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