Hranljiva vrednost sirovog i termički obrađenog zrna soje u ishrani tovnih pilića u zavisnosti od nivoa tripsin inhibitora / Nutritive value of raw and heat treated soybean in broilers nutrition depending of the level of tripsin inhibitor

Soybean is one of the basic feed used in the chickens diet for , to satisfy the protein and essential amino acids needs. By total protein content and their biological value, the soybean is classified as one of the best protein sources, whose amino acid structure can fully meet the needs of chickens in almost all essential amino acids. The presence of Kunitz trypsin inhibitor (KTI), and other thermolabile antinutritional factors limiting the use of soy with necessary thermal processing. Selection progress has enabled the creation of new varieties that have lower levels of anti-nutritional factors, including the variety "Lana". Our results showed that the use of soybean variety "Lana" in mixtures (grower and finisher) for broilers at the concentration of 30% gave a significantly lower production parameters, as compared to heat-treated, but also a significant better, compared to the thermally non-treated soybean variety with standard level of KTI . Noted Economic efficiency and the Price index in the SL group was almost the same as in the group with thermal treatment. Largest surface and height of the villi and crypt depth was observed in the SL group. We found a statistically significant hypertrophy of the pancreas and enlargement of the liver in the SS group and a significant increase in pancreatic at SL group compared to the groups with thermal treatment. Evident is significantly worse digestibility of nutrients (marker method , and the method of total collection ) in the SL and SS groups opposed to those groups that were on the thermal treatment. When using a different levels of variety " Lana" in the finisher ( pelleted ) diets for broilers , in terms of production parameters, values obtained were satisfactory with sporadic deviations in groups and SL14% SL21% . Also index price and economic efficiency is highly approximate to the control group. The digestibility at the distal ileum was significantly better in the control and the SL 7%, group in contrast to the proximal ileum, where is no statistical significance. The digestibility of nitrogen in the distal ileum was significantly inferior to 21% SL group, and in the proximal ileum, there is no statistically significant differences. Nitrogen retention was significantly better control, and in 7%SL group. Considering all the results, the use of variety "Lana" in diet for broilers without heat treatment is not recommended in the grower mixture (from 11 day) at the concentration of 30%, but it is freely available for use in pellet for of finisher mixture, at levels up to 14% of mixture.