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This study was conducted to investigate the effects of feeding increasing proportions of corn grain on concentration of lipopolysaccharide (LPS) in the rumen fluid and the subsequent alterations in immune responses as reflected by plasma concentrations of serum amyloid A (SAA) and haptoglobin (Hp) in goats. Nine goats were assigned to three diets (0%, 25%, and 50% corn grain) in a 3 ×3 Latin square experimental design. The results showed that as the proportion of dietary corn increased, the ruminal pH decreased (p&lt; 0.001), and the concentrations of propionate (p&lt;0.001), butyrate (p&lt;0.001), lactic acid (p = 0.013) and total volatile fatty acid (p = 0.031) elevated and the ruminal LPS level increased (p&lt;0.001). As the proportion of dietary corn increased, the concentration of SAA increased (p = 0.013). LPS was detectable in the blood of individual goats fed 25% and 50% corn. A real-time PCR analysis showed that the copy number of phylum Bacteroidetes (p&lt;0.001) was reduced (4.61×10(9)copies/mL to 1.48×10(9)copies/mL) by the increasing dietary corn, and a correlation analysis revealed a significant negative correlation between the number of Bacteroidetes and rumen LPS levels. Collectively, these results indicated that feeding goats high proportions (50%) of corn grain decreased the ruminal pH, increased LPS in the rumen fluid and tended to stimulate an inflammatory response.

asian-australasian journal of animal sciences

Effects of Feeding Increasing Proportions of Corn Grain on Concentration of Lipopolysaccharide in the Rumen Fluid and the Subsequent Alterations in Immune Responses in Goats