The basis of the research is tasked with optimizing gestation sow feeding normalized by use in the diet of fodder additive "PROPIHplv" production International Probiotic Company, Slovakia, which obtained the technical specifications and permission to use in Ukraine.

Studies have shown that the optimal dose feed additive "PROPIHplv" in gestation diets of sows, which positively affected the exchange rates of nutrients in animals, as well as the dynamics of live weight for the gestating period is 4–5 g per.

Probiotic feed additives – is important naturally occurring microorganisms that have the ability to positively influence when administered in the diet on the physiological, biochemical and immune response of the host organism through stabilization and optimization functions microflora of the gastrointestinal tract.

In recent years, a huge number of probiotic feed additives, so the main objective of our research was to investigate the effect of productive probiotic feed additive "PROPIHplv" as part of the diet of gestation sows.

The main trend of breeding sows in many countries is to reduce rations composed of inorganic additives replacing them with organic dietary supplements natural substance which without prejudice to animal health has a positive effect on the digestive processes in the gastrointestinal tract. Do of probiotic feed additives, which appeared to market of our country, include: "PROHALplv", "PROPIHplv", "PROPUOLplv" Slovak production. These biological feed additives contain probiotic strains microorganisms and components of natural origin with antibacterial action on pathogenic and opportunistic patho-
genic microorganisms and destination for both animals and poultry.

The basis of the research is linked with the task of feeding process optimization through use in the diet of gestation sows of large white breed feed additive "PROPIHplv" against the background of the concentrate type of feeding animals.

Analysis of the total feed cost estimates showed that the need for energy and nutrients in gestating sows first period did not significantly differ from the needs of blank sows. It should be noted that the experimental animals gestating during the first period (84 days) consumed the same amount of feed. Some differences were observed in the second period, which can be attributed to the positive impact of feed additives. The whole period of gestating sows in the study groups was stable.

Thus, as a result of the introduction of the feed additive "PROPIHplv" in the diet of sows research groups within 84 days of the first period gestating average daily live weight control group comprised 442.8 g and 2, 3 and 4 experimental groups, respectively – 501.1; 529,7 and 540.4 g, which is 58.3; 86.9 and 97.6 g or 13.1; 19.6 and 22.0 % more, thus emphasizes the positive effect of feed additives on digestion in the gastrointestinal tract of sows. Along with the digestibility of nutrients and dynamics of the live weight of test animals is important efficiency of feed protein in the body, as this mainly depends on the intensity of their growth and development.

Studies have shown that the experimental feed additive dose showed a positive effect, not only on nitrogen digestibility and assimilation and performance of sows it in the body of experimental animals.

Thus, according to the average daily nitrogen exchange we can state that the optimal dose feed additive "PROPIHplv" in gestation diets of sows is 4–5 grams per head/day.

We will conduct diverse research, to study the use of probiotic feed additive "PROPIHplv" in the diets of sows received from young after birth and at weaning and fattening.

Key words: farrowing sows, feed additive "PROPIHplv", ration, nutrition, nutritional value, digestibility, live weight, balance.