Effect of trypsin inhibitor activity in soya bean on growth performance, protein digestibility and incidence of sub-clinical necrotic enteritis in broiler chicken flocks.

1. The effect of three different levels of dietary trypsin inhibitor activity (achieved by varying the amount of non-toasted full fat soya bean in replacement for toasted full fat soya bean) on the incidence of spontaneously-occurring sub-clinical necrotic enteritis (NE) in broiler chickens was compared. A fourth dietary treatment compared the effect of a diet that used potato protein concentrate as the major protein source.

Effect of dietary protein concentrates on the incidence of subclinical necrotic enteritis and growth performance of broiler chickens.

An experiment was conducted to quantify the effects of 3 nutritionally complete (similar protein and energy) corn-based diets that contained different dietary protein concentrates (potato-CP 76%, fish-CP 66%, or a mixture of soy proteins, soybean meal-CP 48%, and full-fat soy-CP 36%) on the incidence of spontaneously occurring subclinical necrotic enteritis (NE) in broiler chickens. A total of 1,260 birds were placed into 18 solid floor pens (70 birds per pen) and fed 1 of the 3 experimental diets from 15 to 31 d of age. The weight gains and feed intakes of the birds fed the potato- and fish-based diets were lower (P < 0.