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United States Department of Agriculture

Agricultural Research Service

Research Project: INTERVENTION STRATEGIES FOR FOODBORNE PATHOGENS DURING POULTRY PRODUCTION AND PROCESSING

Location: Poultry Microbiological Safety & Processing Research

Title: Evaluation of formic acid and propionic acid feed additives on environmental and cecal Salmonella Typhimurium in broilers)

Author
item Wilson, Kimberly
item Ritz, Casey
item Kiepper, Brian
item Bourassa, Dianna
item Cox, Nelson - Nac
item Buhr, Richard - Jeff

Submitted to: International Poultry Scientific Forum
Publication Type: Abstract only
Publication Acceptance Date: 11/5/2013
Publication Date: 1/27/2014
Citation: Wilson, K.M., Ritz, C.W., Kiepper, B.H., Bourassa, D.V., Cox Jr, N.A., Buhr, R.J. 2014. Evaluation of formic acid and propionic acid feed additives on environmental and cecal Salmonella Typhimurium in broilers. International Poultry Scientific Forum. 93:(E-Suppl. 1) M34. p.111-112. 2014..

Interpretive Summary:

Technical Abstract: Three trials were performed to evaluate the effectiveness of formic acid and propionic acid on environmental and cecal recovery of Salmonella. Trial 1: Chicks (33/pen) were placed in one of 3 treatments with 8 reps, Trt A: 1 kg/ton formic acid, Trt B: 5 kg/ton formic acid, and Trt C: no formic acid. At 1 d, 3 seeders were challenged with 10^4 cfu/mL of nalidixic acid-resistant Salmonella via gavage and were placed in a low challenge room (4/12 pens) or a high challenge room (8/12 pens). Seeders were taken out at 3 wk to confirm colonization and penmate ceca were collected at 3 and 6 wk. Litter was sampled weekly using stepped-on-drag swabs. There were no treatment differences most likely due to high exposure of Salmonella from seeders in the challenge pens for 3 wk and the low exposure in all adjacent pens without seeders. Trial 2: Chicks (40/pen) were placed into one of 4 treatments with 3 reps, Trt A: formic acid in feed, Trt B: formic acid in water, Trt C: formic acid in feed and water, Trt D: no formic acid. At 1 d 2 seeders/pen were challenged with 10^7 cfu/mL of Salmonella. Litter was sampled weekly. At 1 wk, seeder ceca were collected to confirm colonization and penmate ceca at 3 and 6 wk. By 6 wk all pens had detectable Salmonella in litter. At 6 wk, Trt C had the lowest cecal recovery at 35%, Trt A 42.5%, Trt B 50% and 60% in Trt D. Trial 3: Chicks (27/pen) were placed in one of 7 treatments with 3 reps; Trt A propionic acid 5kg/ton wk 0-6, Trt B propionic acid 5kg/ton wk 5-6, Trt C propionic acid 10kg/ton wk 0-6, Trt D propionic acid 10kg/ton wk 5-6, Trt E formic acid 4kg/ton wk 5-6, Trt F formic acid 6kg/ton wk 5-6 and Trt G no acids added. At 1d, 2 seeders/pen were challenged with 10^7 cfu/mL of Salmonella. Seeder ceca were collected at 1 wk and penmate ceca at 6wk. Litter was sampled at wk 3, 5, and 6. By 6wk, Trt A had no Salmonella-positive ceca or litter in all pens. Trt D, E, and F (fed wk 5-6 as a cleanout supplement) had at least 1 Salmonella-positive ceca. Only Trt G had Salmonella-positive breast skin (20%) following scalding and defeathering. Given the results from trial 1 and changing techniques for trial 2 and 3, when exposed to Salmonella seeders for 1 wk, broilers given formic acid in feed and water had the lowest recovery and those given 5kg/ton 0-6 wk of propionic acid did not have detectable levels of Salmonella in ceca, litter, or breast skin by 6 wk.

Last Modified: 8/24/2016
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