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Raw vs extruded coloured-flower pea as an ingredient in broiler diets: effects on performance, ileal digestibility, gut morphology, and intestinal microbiota activity

P. Konieczka 1,  
S. Smulikowska 1  ,  
The Kielanowski Institute of Animal Physiology and Nutrition, Polish Academy of Sciences, 05-110 Jabłonna, Poland
J. Anim. Feed Sci. 2014;23(3):244–252
Publication date: 2014-09-09
Raw or extruded peas (Pisum sativum, pink-flowered cv. Milwa) were used. Extrusion reduced the trypsin inhibitor activity (TIA) from 2.35 to 0.35 mg · g–1, but did not affect tannins content, which was about 1 g · kg–1. A growth trial was conducted on 200 Ross 308 female broilers from day 1 to 35 of age. There were 3 treatment groups from day 1 to 14 including control without peas, 10% raw (RP) and extruded (EP) pea. From day 15 birds were kept individually, in groups of 18, and fed diets containing 15%, 20%, 25%, or 30% RP and EP. Chickens fed EP ate more feed (P ≤ 0.05) but had similar body weight gains and worse feed conversion ratio (P ≤ 0.05) than chickens fed RP. The apparent ileal digestibility (AID) of dry matter was lower in chickens fed EP than RP (P ≤ 0.01), whereas AID of protein did not differ. The AID of starch was 0.835 in the control group, in chickens fed both RP and EP it was, on average, 2 percentage points higher (P ≤ 0.01). In birds fed RP the short-chain fatty acid concentration in ileal digesta was lower (P ≤ 0.05) whereas in caecal digesta higher (P ≤ 0.01) than in birds fed EP. The dietary treatments had no effect on jejunal mucosa morphology. Diets containing up to 30% of peas with a relatively low tannins content and moderate TIA value, can be fed from the third week of life as a partial substitute of soyabean meal in broiler diets. The effects of pea extrusion on ileal nutrient digestibility and activity of gut microbiota was too small to affect performance.
S. Smulikowska   
The Kielanowski Institute of Animal Physiology and Nutrition, Polish Academy of Sciences, 05-110 Jabłonna, Poland
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