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Polymeric carbohydrates, starch and non-starch polysaccharide (NSP), are the main ingredients in the diets and are the major energy contributors for pigs (Bach Knudsen, 2011). Noteworthy, types of starch, from their nature, differ in an amylose to amylopectin ratio (AM/AP). As the molecular configuration and structure are different, amylopectin-rich starch is easily digested, while amylose-rich starch not (Singh et al., 2010). Indeed, it was previously shown that feed intake and feed efficiency in pigs were reduced along with increasing amylose content (Regmi et al., 2011). Additionally, amylopectin could lead to a rapid increase in glucose and insulin concentrations relative to amylose (Behall and Scholfield, 2005; Regmi et al., 2010). Moreover, it was indicated that higher level of amylopectin negatively influences the hepatic lipid deposit in pigs and should be avoided in the diet composition (Yang et al., 2018). Yet, emerging evidences indicated that starch with relative higher AM/AP ratio increased the average daily gain and feed efficiency in finishing pigs (Li et al., 2017; Wang et al., 2019), and tended to decrease the average back ABSTRACT. The aim of the present study was to investigate the effects of different combinations of dietary starch and non-starch polysaccharides (NSP) on intestinal functions, and lipid and glucose metabolism in pigs. Fifty-four weaned pigs weighing 6.71 ± 0.52 kg were randomly assigned according to body weight and sex to 3 treatments with 6 replicates per treatment and 3 pigs per replicate, and were fed: T1 diet containing starch with amylose/amylopectin (AM/AP) ratio of 1:1 and NSP 3% (a mixture of inulin and cellulose in a ratio 1:1), T2 diet with starch of AM/AP ratio 2:1 and NSP 1% or T3 diet containing starch with AM/AP ratio of 1:2 and NSP 2%. Pigs were fed experimental diets for 28 days. It was shown that in animals fed T1 diet mRNA expression of glucagonlike peptide-2, zonula occludens 1 and occludin (P < 0.05) were up-regulated and tended to be increased the mRNA level of insulin-like growth factor-1 (P = 0.06) in colon, the activity of lactase in jejunum was increased (P < 0.05), mRNA expression of insulin receptor substrate 1 and glucose-6-phosphatase in liver were improved (P < 0.05), and the activity of lipoprotein lipase (P < 0.05) was decreased and the activity of malate dehydrogenase tended to be enhanced (P = 0.07) in longissimus dorsi muscle. Feeding T1 diet promoted the intestinal functions and improved to some extent lipid and glucose metabolism in pigs. So, carbohydrates combination of starch with AM/AP ratio of 1:1 and NSP 3% can be recommended for weaned pigs. Received: 14 April 2020 Revised: 20 May 2020 Accepted: 16 September 2020

journal of animal and feed sciences

Effects of different combinations of dietary starch and non-starch polysaccharides on intestinal functions, and lipid and glucose metabolism in weaned pigs