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The rabbit is a monogastric herbivorous animal, and its digestive anatomy and physiology are well adapted to high intake of fibrous feedstuffs (Gidenne et al., 2010). The rabbit caecum, which constitutes 40% of the total digestive tract, is the main compartment for structural carbohydrates (fructans, galactans, mannans, mucilage, pectins, hemicelluloses, cellulose) degradation and fermentation processes. These fibrous substances of structural carbohydrates are important for the gut environment due to their influence on the digesta passage rate and mucosa functionality, and their role as a substrate for microbiota. The total dietary fibre in fibrous feedstuffs includes cell wall components [water-soluble non-starch polysaccharides (part of β-glucans, arabinoxylans, part of pectic substances) and water-insoluble polyABSTRACT. The aim of the study was to compare nutrients, condensed tannins, fibre and in vitro fermentation parameters from different fibrous feedstuffs, both common (sugar beet pulp, wheat bran, lucerne meal) and uncommon (tomato pomace, maize bran, rice bran, lentil bran and pomegranate peel) in rabbit feeds with the in vitro gas production technique using rabbit faeces inoculum. The total dietary fibre and insoluble dietary fibre concentration were the lowest (28.9 and 23.7%) for rice bran and the highest (70.2 and 63.1%) for sugar beet pulp. The highest digestible fibre fraction was in sugar beet pulp (44.5%). The highest total condensed tannin, bound condensed tannin and extractable condensed tannin levels were determined in lentil bran. The in vitro gas production from insoluble fraction (bgas; 111 and 100 ml · 0.5 g–1 DM, respectively) and potential gas production values [(a+b)gas; 105.5 and 94.7 ml · 0.5 g–1 DM, respectively] were the highest in tomato pomace and sugar beet pulp. The bgas and (a+b)gas values of maize bran were higher by about 50% than those of wheat and rice bran ( < 0.001). The bgas and (a+b)gas values of pomegranate peel were approximately 4 times higher than those of lentil bran ( < 0.001). These results suggested that considering in vitro gas production tomato pomace, maize bran and rice bran could be further studied for use as alternative dietary fibrous feedstuffs for rabbit. It can be suggested that pomegranate pomace and lentil bran could be used as alternative dietary fibrous feedstuffs for the growing rabbit due to their high fibre content and low fermentation capacity. Received: 9 March 2016 Revised: 1 June 2016 Accepted: 11 August 2016

journal of animal and feed sciences

Effect of dietary fibre and condensed tannins concentration from various fibrous feedstuffs on &lt;i&gt;in vitro gas&lt;/i&gt; production kinetics with rabbit faecal inoculum