Impact of fructose supplementation on feed intake, nutrient digestibility and retention time of digesta in Reeves’s muntjac (Muntiacus reevesi)
Marcin Przybyło , Marcus Clauss , Sylvia Ortmann , Zygmunt Kowalski , Paweł Górka
AbstractIncreased intake of mono- and disaccharides by captive ruminants classified as browsers raises concerns, due to possible negative impact of high intake of sugars on the gastrointestinal tract (GIT) of these animals. The aim of the study was to determine the effect of fructose supplementation in the diet on feed intake, total tract nutrient digestibility and fluid and particle retention time in the digestive tract of Reeves’s muntjac (Muntiacus reevesi), a browsing ruminant. Six adult males of muntjac were used in a cross-over design and fed a diet consisting of dehydrated chopped lucerne (ad libitum), high-fiber pellet (120 g/day) and wheat bran (30 g/day) without (F0) or with addition of 12 g fructose/day (F12). Dose of supplemental fructose for F12 was set to increase water soluble carbohydrates (WSC) intake by 25% relatively to F0. Each experimental period lasted 21 days. Feed intake was controlled daily whereas fecal samples were collected during the last 7 days of each period. Apparent total tract nutrient digestibility was determined using acid insoluble ash as a marker. Co-EDTA, Cr-mordanted fiber and Cemordanted fiber were used as pulse-dose markers of fluid, small and large particles, respectively. Mean retention times (MRT) in the GIT and the reticulorumen (RR), and selectivity factors (SF; the ratio of the MRT of Co and Cr markers) were calculated from fecal marker excretion. Total dry matter intake was not affected by fructose supplementation (P > 0.59). WSC intake increased from 46 g/day for F0 to 55 g/day for F12, resulting in a WSC content in consumed DM of 9.9% and 12.2% for F0 and F12, respectively. Total tract nutrient digestibility did not differ between treatments (P ≥ 0.17). In general, the MRT of particles in the GIT was longer than MRT of fluid, but SF were relatively low and typical for browsing ruminants. MRT of fluid and particles in RR, as well as SF did not differ between treatments (P ≥ 0.22). MRT of big particles in the whole GIT tended to be longer for F12 compared to F0 (by 1.7 h; P = 0.09). Results of this study indicate that moderate increase of WSC intake by Reeves's muntjacs (and possibly other browsing ruminants) does not affect feed intake, total tract nutrient digestibility, but may affect retention time of the digesta in the GIT.
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|Book||Cledwyn Thomas (eds.): Advances in Animal Biosciences : Proceedings of the XIIIth International Symposium on Ruminant Physiology (ISRP 2019), 3-6 September 2019, Leipzig, Germany, Advances in Animal Biosciences, vol. 10, no. 3, 2019, Cambridge University Press, 658 p.|
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