The article presents data on the effect of the phytobiotic additive “Activo” at a dose of 0.2 g/kg of feed on the piglets live weight of the growing and finishing fattening periods. The average daily gain and feed consumption per 1 kg of weight gain were determined during the experiment. Among biochemical parameters it was determined the level of total proteins, protein fractions (albumin and globulins), calcium and inorganic phosphorus. The level of morphological parameters in the blood of piglets of both fattening periods was determined. In particular, the content of hemoglobin, erythrocytes, leukocytes, platelets, eosinophils, rod-shaped and segmented granulocytes, lymphocytes, monocytes and hematocrit was determined. As a result of the research, it was found that the addition of a phytobiotic feed additive in the amount of 0.2 g/kg to the growing and finishing feed increased live weight by 8.12 and 3.36 %, respectively. At the same time, feed consumption per 1 kg of weight gain was reduced in the experimental group of piglets of the growing and finishing periods by 8.84 and 10.95 %, respectively. Phytobiotic additive at a dose of 0.2 g/kg of feed influenced the level of biochemical and morphological parameters in the piglets’ blood of the growing and finishing fattening periods. In particular, in the experimental group of piglets of the growing period, the level of total protein was higher by 5.25 %, and in the finishing period, it was lower by 7.60 %. Morphological parameters in the blood of piglets of the growing and finishing fattening periods of the experimental group had a higher level of hemoglobin, red blood cells and leukocytes. In piglets of the experimental group in the final period of fattening, the level of platelets, eosinophils and hematocrit was higher.

The study was conducted in two stages. The first stage of study was carried out on lactating sows with suckling piglets, and then on weaned piglets up to 43 days of age. The second stage was carried out on young pigs from 43 to 165 days of life during fattening stage. For the study, two groups of sows of the 2–3 farrow were formed. The sows of the control group (C) were fed standard feed, and the experimental group (E) received standard feed with the addition of the “EnzActive Mix” feed additive in the amount 0.3 kg/t of feed. The suckling piglets received pre-starter feed from 5 days of age until weaning. The E group received the experimental feed additive in the amount of 500 g/t. Weaned piglets in the growing period continued to consume pre-starter feed. After the 43 day of life, the piglets in E group received the “EnzActive Mix” feed additive in the amount of 0.3 kg/t to the standard feed. It was found that during the experiment, which lasted 33 days, the live weight of sows decreased by 25 kg (C) and by 20 kg (E), which is 2.44% less (P<0.001). In the early age piglets in E group, there was a statistically significant increase in live weight on day 28 (P<0.001) or by 15.28% compared to C group. After fourteen days of growing, the piglets of E group had a significant increase in live weight (P<0.001) or 12.61%, compared to C group. The increase in live weight in E group is confirmed by the piglets average daily gain rise on 7.14% (P<0.001). The second (fattening) stage of the experiment showed that after adding the “EnzActive Mix” feed additive, from 43 to 80 days of life the average weight in the E group was 15.38% (P<0.001) higher than in C group, and also the increase in live weight by 14.55% (P<0.001) was admitted. We found out an increase in average daily weight gain by 17.27% (P<0.001) in the E group, pointing that the cost of feed to obtain 1 kg of weight gain was lower by 14.61% comparing to the C group. In the second fattening period from 81 to 118 days of life, the live weight in E group increased by 15.4% (P<0.001), live weight gain and average daily weight gain increased by 17.94% (P<0.001), compared to C group, whereas the feed costs per 1 kg of weight gain decreased by 15.38% (P˃0.001). In the third period of fattening, which lasted from 119 to 165 days of life, the feed consumption per 1 kg of weight gain in E group was significantly lower by 9.06 (P˃0.001), and an increase in live weight and average daily weight gain by 9.86% (P<0.001) was noted.