The efficiency of pork production and its quality is largely dependent on rations enrichment necessary quantity of nutrients and bioactive substances. Recently introduced in pig rations consisting of premixes and other feed additives.

Among the new premixes there is Intermiks that is produce by Ukrainian company LLC "Interahroteh" (m. Vinnytsya) for virtually all technological groups of pigs.

The aim of research was to study the performance of slaughtered young pigs grown for meat when fed with Intermiks premixes.

Studies were conducted on three groups-analogues young pigs of large white breed, with initial body weight of 14.5 kg. In groups were 12 heads of animals taken from sows after weaning at 45 days age.

After a 15-day period equalized in the diets of animal groups for the second phase feeding 20–35 kg administered premix Intermiks Visitor Messages in an amount of 1.25 %. And in phase 35–65 kg and 65–110 kg – premix Intermiks BC 1 % by weight of feed.

Young pigs in the third group phase of the main feeding period of the experiment received premix according Intermiks PV-4 %, Intermiks BC-3 % and Intermiks BC-2.5 %.

Animals first (control) group in the different phases of the experiment period, the main diet eat mostly premix PIP Euromixcompany "Eurokorm modern feeding", designed according to the requirements of each phase feeding.

Studies have shown that the use in feeding young pigs premix Intermiks has a positive effect on slaughter performance, but the results in both experimental groups compared to control mixed. Much better were the third group of animals that are in the phase of feeding 65 to 110 kg obtained in the diet premix Intermiks AC-3 and 2.5 %. Under these conditions, in animal experiments ante live weight increased by 16.52 kg, or 15.95 % (P<0,01), weight at slaughter 16.6 kg, or 19.65 % (P<0,01). Quite significant was the increase in carcass weight 14,67 kg, or 21.16 % (P<0,01). However, carcass yield increased by only 2.43 %. The animals of the second group phase in the feeding of 65–110 kg eat premix Intermiks VS-1 %, the likely increase compared to the control value received only three indicators, namely: ante live weight (on 5.19 kg or 5.0 %), slaughter weight (in 2.48 kg or 2.9 %) and weight of the head (on 0.52 kg or 10.2 %).

Absolute data mass of internal organs of pigs indicate that liver, spleen and stomach in experimental groups had no significant alteration in comparison with control. While other organs reacted according to the study factor increasing mass feeding. This refers to the weight of the heart, kidneys (P<0,05) and lung (P<0,01).

Endocrine glands also increased their weight in animals of experimental groups, especially in the third group, where the weight of the thyroid prevailed reference value at 16.84 %, adrenal gland – by 22.54 % and pancreas – to 25.58 %. While in the second group, these figures were much lower – within 4.6–11,5 %.

The increase in mass of internal organs of pigs has a direct correlation with their body weight before slaughter and may indicate a better development of these tissues and improving functional activity in the growth created conditions in supply.

Feeding studied premixes impact on increasing the thickness of bacon pigs. Naytovschym speck was in the third group of animals. Especially in the neck and back – respectively 29.1 and 35.4 % (P<0,05). And at the withers and loins of bacon thickening was 16.6 and 18.6 % (P<0,05).

Indicators of bacon thickness and weight of internal fat of all three groups suggest that the premix Intermiks sun that consumed the animals of the third group, causes intensified fat metabolism. And therefore the absolute increase in body weight during the experiment for the fat content in most of these animals.

Slaughter figures were obtained under the following performance parameters: average daily two and three animal groups dominated their importance in the control respectively by 37 and 141 g or by 5.5 and 21.0 % (P<0,01), at their level and 709 813 g per day.

The daily feed consisted of a set of Dirty barley (44 %), wheat (38 %) and soybean meal (18 %) and premix enriched by the circuit experiment. Total nutrient intake in all phases of feeding a power feed units corresponded to normal. The diet balanced 30 indicators of supply. In addition, as part of premix animal received no vitamin K₃, B₆, C, choline, niacin, pantothenic and folic acid. All this contributed to a relatively high growth of animals.

Consequently, the use in feeding young pigs Intermiks new premixes increases downhole parameters.

Key words: piglets, premixes, feeding, slaughter indexes, fat thickness, internal organs, glands.