A scientific and economic experiment with 26 swine of the breed combination ♀Dunabe White Swine x (Еnglish Landrace x Pietrain) x ♂Danish Landrace was carried out in Agricultural Institute – Shumen. The animals were divided into two groups of 13, raised in separate boxes. The experiment was divided into two sub-periods, starting at an average live weight of 30.63 kg and ending at 110 kg live weight. During the first sub-period (30 to 60 kg live weight), the swine from first group were given a combined feed containing 16.4% crude protein, 0.80% lysine, 0.87% calcium and 0.66% phosphorus, and during the second period (from 60 to 110 kg live weight) – 15.5% crude protein, 0.85% lysine, 0.64% calcium and 0.45% phosphorus. Animals from the second group were given the same combined feed, accordingly for the first and second sub-periods, with the addition of herbal supplement (30% nettle leaves, 5% dandelion, 5% hawthorn, 10%  goosegrass, and 50% rosehip flour) at 10g per day. The usage of herbal supplement in the compound feed for fattening pigs from the Dunabe White breed, from 30 to 110 kg live weight, does not significantly affect the growth rate and feed conversion ratio per kg gain. The animals from the experimental (II) group have a higher average daily increase during the period from 60 to 110 kg live weight with 4.34% in comparison to those from group I, but all differences are statistically insignificant. There is a tendency for slightly better fat characteristics in animals receiving the herbal supplement. The usage of the tested herbal supplement needs additional studies to detect the effects on fattening pigs.