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The effect of varying levels of high- and low-tannin faba bean (Vicia faba L.) seeds on gastrointestinal function and growth performance in turkeys

D. Mikulski 1  ,  
J. Jankowski 1,  
M. Mikulska 1,  
University of Warmia and Mazury in Olsztyn, Department of Poultry Science Oczapowskiego 5, 10-718 Olsztyn, Poland
Institute of Animal Reproduction and Food Research, Polish Academy of Sciences Tuwima 10, 10-748 Olsztyn, Poland
J. Anim. Feed Sci. 2017;26(3):257–265
Publish date: 2017-08-10
A two-factor experiment was conducted to evaluate the effect of varying dietary levels (10, 20 and 30%) of faba bean (FB; Vicia faba L.) seeds with high- and low-tannin content (HT and LT, respectively) on the gastrointestinal function and performance of turkeys during the last 6 weeks of rearing. In the control group (FB0), birds were fed maize-soyabean meal-based diets. In comparison with HT FB seeds, in LT seeds lower content of condensed tannins (0.78 vs 0.08% DM) was determined. Different dietary inclusion levels of HT and LT FB had no influence on feed intake or viscosity and pH of small intestinal digesta, and the pH of caecal digesta as compared with FB0. In comparison with HT FB, LT seeds increased ammonia concentrations, decreased pH and reduced activity of microbial α-glucosidase in the caecal digesta. All diets containing FB stimulated the activity of β-glucuronidase in comparison with diet FB0. In turkeys fed LT seeds the production of short-chain fatty acids (SCFAs) was higher than in birds fed HT FB. Body weight gains of turkeys were comparable in all groups, however feed conversion ratio was lower in groups fed LT than HT FB seeds. So, FB enhanced fermentation processes in the gastrointestinal tract of turkeys, but had no influence on their performance. Both LT and HT FB seeds can be included in finisher turkey diets (up to 30%) as an effective substitute for soyabean meal. FB with lower tannin content improved selected parameters of gastrointestinal function, including increased SCFA production in the caeca and so improved feed efficiency.
D. Mikulski   
University of Warmia and Mazury in Olsztyn, Department of Poultry Science Oczapowskiego 5, 10-718 Olsztyn, Poland
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