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The inclusion of faba bean (FB; Vicia faba L.) in diets for monogastric animals was investigated in numerous experiments performed in the last decade of the 20th century (e.g., Van Der Poel et al., 1992; Smulikowska and Chibowska, 1993; Frejnagel et al., 1997). Fluctuations in the production volume and price of soyabean meal (SBM) has stirred interest in legumes (Jezierny et al., 2010) that can be used to improve soil fertility in agricultural ecosystems and provide natural protection against pests (Cazzato et al., 2012). In organic livestock production systems, the seeds of locally grown legume crops are a viable alternative to SBM with a high risk of GMO contamination (Tufarelli and Laudadio, 2015). ABSTRACT. 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 highand 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. Received: 23 February 2017 Revised: 8 June 2017 Accepted: 1 August 2017

journal of animal and feed sciences

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