The effect of dietary sugars on ruminal fermentation, stomach measurements and blood parameters in Reeves’s muntjac (Muntiacus reevesi)
Marcin Przybyło , Jadwiga Flaga , Olga Lasek , Justyna Barć , Marcus Clauss , Zygmunt Kowalski , Paweł Górka
AbstractIncreased intake of mono- and disaccharides (MD) by captive ruminants raises concerns, due to possible negative impact on the gastrointestinal tract (GIT). MD are rapidly fermented in the rumen, which may result in a rapid short-chain fatty acids (SCFA) increase and a pH drop below the optimum. The aim of this study was to determine the effect of addition of a glucose, fructose and sucrose mixture (on as fed basis: 25% of glucose, 25% of fructose and 50% sucrose in the mixture) into the diet on feed intake, ruminal fermentation, stomach measurements and selected blood parameters of Reeves’s muntjac (Muntiacus reevesi), a browsing ruminant. Eighteen male Reeves’s muntjacs were kept individually and fed diets consisting of dehydrated chopped lucerne (ad libitum), high-fiber pellet (100 g/day) and wheat bran (30 g/day) without (MD0) or with addition of 10 or 20 g of glucose, fructose and sucrose mixture/day (MD10 and MD20, respectively). Doses of mixture of MD were set to increase intake of these saccharides by 25 and 50% relative to MD0, which resulted in a range of water soluble carbohydrates content in consumed dry matter from 7.5 to 12.1%. Blood, GIT tissue and digesta samples were collected after 14 days of adaptation to the experimental diets, two to three hours after feeding. MD20 group tended to be heavier at the end of the study than MD10 (P = 0.07). Total feed intake (g/day) did not differ between MD0, and MD10 and MD20 (P = 0.22), but was lower for MD10 compared to MD20 (P = 0.02). MD supplementation did not affect ruminal pH (P ≥ 0.33) nor ruminal SCFA (P ≥ 0.15), except for higher butyrate concentration for MD10 and MD20 compared to MD0 (P = 0.02). Relative ruminal tissue mass (g/kg of body weight) tended to be lower for MD0 compared to MD10 and MD20 (P = 0.09) and MD supplementation decreased relative mass of full omasum and omasal tissue (P ≤ 0.05). Relative mass of full abomasum and abomasal digesta were lower for MD0 compared to MD10 and MD20 (P ≤ 0.02). Plasma glucose, cholesterol, triglycerides and non-esterified fatty acids concentrations tended to be higher for MD10 and MD20 compared to MD0 (P ≤ 0.10). In conlusion, the increase of dietary MD may affect feed intake, measurements of stomach and blood parameters in Reeves’s muntjac, without impacting ruminal pH.
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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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