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Infusion of sodium butyrate promotes rumen papillae growth and enhances expression of genes related to rumen epithelial VFA uptake and metabolism in neonatal twin lambs.
Journal of Animal Science 2018 December 8
The objective of this study was to evaluate the effect of sodium butyrate (SB) infusion on rumen papillae growth and volatile fatty acids (VFA) uptake and metabolism in neonatal lambs. Seven pairs of newborn twin lambs were used. Within each pair, lambs were assigned to receive an oral infusion of SB at 0.36 g/kg body weight (BW) (SB, n = 7) or the same volume of saline (Con, n = 7). Treatments were administered from 10 to 49 d of age, when all lambs were slaughtered. Results showed that the average daily feed intake (ADFI) of starter, average daily gain (ADG), BW of lambs at ages of 5 and 6 wks in SB group were greater (P < 0.05) than those in Con group. Infusion of SB increased (P < 0.05) the concentrations of acetate, butyrate, and total VFA in the rumen fluid and elevated (P < 0.05) the levels of β-hydroxybutyrate acid (BHBA), insulin-like growth factor-1 (IGF-1) and insulin in plasma. Infusion of SB promoted rumen papillae growth, depicted by higher emptied rumen weight, larger rumen papillae length, width, and surface area, and greater thickness of stratum corneum and total epithelium. SB infusion upregulated (P < 0.05) mRNA expression of cyclin A2, cyclin D1, and cyclin-dependent kinases 6 (CDK6), and downregulated (P < 0.05) mRNA expression of caspase-3 and Bcl-2-associated X protein (Bax) in the rumen epithelia. Moreover, SB infusion also upregulated (P < 0.05) mRNA expression of insulin like growth factor-1 receptor (IGF-1R), and insulin-like growth factor-binding protein 5(IGFBP-5), and downregulated (P < 0.05) mRNA expression of insulin-like growth factor-binding protein 3(IGFBP-3) in the rumen epithelia. SB infusion also enhanced (P < 0.05) gene expressions of monocarboxylate transporter isoform 1 (MCT1), downregulated in adenoma (DRA), 3-Hydroxy-3-methylglutaryl-CoA synthase isoform 2 (HMGCS2), and 3-Hydroxy-3-methylglutaryl-CoA lyase (HMGCL), while depressed (P < 0.05) mRNA expression of sodium/proton exchanger isoform 2 (NHE2) in the rumen epithelia. Our results suggest that the SB infusion can improve animal performance, promote the ruminal papillae growth, and enhance expression of genes related to ruminal epithelial VFA uptake and metabolism in pre-weaning twin lambs. These findings provide a better understanding of the molecular mechanism of SB promoting rumen epithelial development and function in pre-weaning lambs.
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