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Articles by R. Qui
Total Records ( 2 ) for R. Qui
  M. Chichlowski , J. Croom , R. Qui , B.W. McBride and M.D. Koci
  Direct fed microbials (DFM) are a putative alternative to the feeding of subtherapeutic levels of antibiotics in poultry production. Previous studies with a DFM, Primalac®, have suggested that DFM may decrease ileal energy expenditures in broilers. These changes might be related to nutrient transport in the gastrointestinal (GI) tract. The current study examined the effects of supplementing broiler diets with DFM on ileal glucose and proline absorption and their relationships to GI energy expenditures. Twenty-four broiler chickens were fed a standard starter diet (CON) and CON + DFM, (PrimaLac® 0.3% w/w) from hatch to 3 wk of age. On d 21, birds were euthanized, ileal tissue was dissected and glucose and proline uptake were estimated. In adjacent tissue, total O2 (TO2) and oubain (Na/K ATPase-sensitive) O2 consumption were estimated. Primalac® had no effect (P>0.05) on ileal glucose and proline absorption transport rates as well as oubain sensitive and non-oubain sensitive oxygen consumption rates. Total passive transport of proline across the entire ileum was decreased by Primalac®.
  J. Croom , M. Chichlowski , M. Froetschel , B.W. McBride , R. Qui and M.D. Koci
  Direct-Fed Microbials (DFM) are a putative alternative to the feeding of sub-therapeutic levels of antibiotics in the production of poultry and other livestock species. This study was designed to examine the effects of a commercial DFM (Primalac®), or salinomycin (SAL), a commonly used antibiotic and coccidiostat supplement, on fermentation patterns and lactate production in the cecum and the lower intestinal tract of broiler chickens. L-lactate and total lactate concentrations in the digesta fluid of the ileum decreased (P<0.01) with the DFM feeding in comparison to CON and SAL treatments while d-lactate concentration increased (P<0.04) in comparison to CON. Total cecal VFA concentration was lower (P<0.003) with DFM feeding and SAL than the CON. In the present study both dietary supplements, DFM and SAL, altered lactic acid and VFA concentrations in the cecum and intestines of experimental animals; however the full spectrum of mechanisms responsible for antibacterial properties and growth promotion associated with those changes remains to be elucidated.
 
 
 
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