Type of Document Master's Thesis Author Orndorff, Brandy Michelle-Woolsey URN etd-06292004-124451 Title Comparison of Prophylactic or Therapeutic Dietary Administration of Capsaicin Oleoresin for Resistance to Salmonella in Broiler Chickens Degree Master of Science Department Animal and Poultry Sciences Advisory Committee
Advisor Name Title McElroy, Audrey P. Committee Chair Novak, Curtis L. Committee Member Pierson, Frank William Committee Member Keywords
- Mast cells
Date of Defense 2004-06-24 Availability unrestricted AbstractABSTRACT
Expt. 1 evaluated effects of 0 or 10 ppm CAP in the starter phase (d 1-16) on chicks challenged with SE on d of age. Therapeutic inclusion of 10ppm CAP increased (P < 0.05) L/S and ceca positives. In Expt. 2, capsaicin oleoresin (CO) was included in finisher diets (d 30-37) at 0, 5, or 20 ppm with SE challenge on day 31. Inclusion of 5 ppm CO increased (P < 0.05) ceca SE positives and demonstrated 1.05 and 1.39-log fewer SE cfu at CO concentration of 5 or 20 ppm, respectively. A linear decrease (P < 0.05) in lamina propria thickness of SE challenged birds was observed with increased CO. Expt. 3 evaluated prophylactic CO treatment at 0, 5, or 20 ppm in starter, grower, and finisher diets for resistance to SE or ST challenge on d 14 or 29. With challenge on d 14, 5 ppm CO reduced ceca (P<0.005) SE positives and 1.1-log fewer SE cfu. Likewise, 20 ppm CO reduced (P < 0.05) SE ceca positives. Salmonella typhimurium isolation rate was reduced (P<0.05) with 5 ppm CO, and ST cfu were reduced 1.4-log with 5 ppm CO compared to 20 ppm. Lamina propria thickness increased (P < 0.05) linearly as CO concentration increased. With d 29 challenge birds fed 5 ppm CO exhibited 1.08-log fewer SE cfu, and 20 ppm CO reduced L/S positives (P < 0.025) for SE and resulted in 1.39-log fewer SE cfu. Lamina propria thickness decreased with 5 ppm CO and SE or ST challenge compared to non-challenged birds fed 5 ppm (P < 0.0005). An increase was observed in ST or SE, birds fed 20 ppm CO compared to non-challenged, birds fed 20 ppm CO (P < 0.01). No differences were observed in mast cell number in either Expt. 2 or 3.
These data provide evidence that prophylactic or therapeutic dietary CAP differentially affect broiler susceptibility to Salmonella and prophylactic administration may provide non-antibiotic means to reduce Salmonella in broilers.
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