The effect of raw soybean in the final mixtures for broiler chickens on the performance and carcass yield

Abstract

The aim of this study was to point out the possibility of replacing a portion of thermally treated soybean of standard variety "Lydia" and variety with reduced trypsin inhibitor "Lana" with raw grain in the final mixes for broiler chickens. The trial was conducted in the last week of the experiment (age 35-42 day). At the beginning (day 35) and at the end of the experimental period (42 day) body mass of chickens, the average daily gain, feed conversion and consumption were determined. At the end of the trial, a random sample of 12 chickens from each group was taken (6 male and 6 female) in order to obtain dressing percentage indicators. The results showed that the increased concentration of TI in mixtures caused significant decrease of average daily gain. Consumption of food was not influenced by the studied factors. Feed conversion was significantly better in chickens fed diets containing soy with lower TI. The share of raw soybean in diets of 15 and 20% resulted in a significantly lower feed conversion. Carcass yields of broiler chickens were significantly influenced by the level of raw soybean in the mixture. The share of abdominal fat was not influenced by the studied factors.