Faculty of Veterinary Medicine, Urmia University Veterinary Research Forum 2008-8140 6 1 2015 03 01 Digestion kinetics of carbohydrate fractions of citrus by-products 41 48 11354 EN Saman Lashkari Department of Animal Science, Faculty of Agriculture, University of Kurdistan, Sanandaj, Kurdistan, Iran Akbar Taghizadeh Department of Animal Science, Faculty of Agriculture, University of Tabriz, Tabriz, Iran 0000-0002-9120-1662 Journal Article 2015 01 14 The present experiment was carried out to determine the digestion kinetics of carbohydrate fractions of citrus by-products. Grapefruit pulp (GP), lemon pulp (LE), lime pulp (LI) and orange pulp (OP) were the test feed. Digestion kinetic of whole citrus by-products and neutral detergent fiber (NDF) fraction and acid detergent fiber (ADF) fractions of citrus by-products were measured using the <em>in vitro</em> gas production technique. Fermentation kinetics of the neutral detergent soluble carbohydrates (NDSC) fraction and hemicelluloses were calculated using a curve subtraction. The fermentation rate of whole was the highest for the LE (<em>p</em> < 0.05). For all citrus by-products lag time was longer for hemicellulose than other carbohydrate fractions. There was no significant difference among potential gas production (<em>A</em>) volumes of whole test feeds (<em>p </em>< 0.16). Dry matter (DM) digestibility contents of LE and LI were the highest (<em>p</em> < 0.02). The NDF digestibility was the highest (<em>p</em> < 0.05) in LI and GP, while the lowest (<em>p</em> < 0.03) values of ADF digestibility were observed in LI and LE. According to the results of the present study, carbohydrate fractions of citrus by-products have high potential for degradability. It could also be concluded that carbohydrate fractions of citrus by-products have remarkable difference in digestion kinetics and digestive behavior. https://vrf.iranjournals.ir/article_11354_a54505e6a589aa3b38674ef107da13c1.pdf