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Articles by I. Hanning
Total Records ( 3 ) for I. Hanning
  R.L. Jarquin , G.M. Nava , A.D. Wolfenden , A.M. Donoghue , I. Hanning , S.E. Higgins and B.M. Hargis
  An Organic Acid Mixture (OAM) was evaluated for efficacy against Salmonella enteritidis (SE) horizontal transmission and crop colonization in broiler chickens. The biocidal efficacy of the OAM (0.024% tannic, 0.042% lactic, 0.048% butyric and 0.048% acetic), was initially determined in vitro by treating a feed suspension inoculated with SE. The OAM was effective at reducing SE by at least 1 log unit in the feed suspension (P = 0.05). Treatment with the OAM was also assessed in combination with a probiotic treatment to evaluate effectiveness against horizontal transmission. One hundred newly hatched chicks were administered 3 treatments of OAM or probiotic, or 3 treatments of both OAM and probiotic over a 10 d period. Chicks (n = 20/group) were orally challenged with a 105 cfu mL-L culture of SE prior to treatment to act as sources for horizontal transmission. Ceca were collected and cultured for SE after 10 or 20 d. Horizontal transmission was reduced with OAM treatment solely (P = 0.05) or in combination with probiotic (P = 0.05). However, no apparent advantage to using both treatments was observed. The ability of the OAM to reduce SE crop contamination was determined by challenging market aged broilers with a 109 cfu mL-L culture of SE and administering the OAM in drinking water. Broilers were challenged with SE and immediately given the OAM or given the OAM 2 d prior to SE challenge. OAM was valuable in preventing horizontal transmission but did not eliminate crop colonization. The emergence of SE strains resistant to multiple antibiotics presents the need for alternative treatments and the results of these experiments show that an OAM may be a cost efficient and effective tool however the method of application of the OAM may alter effectiveness.
  I. Hanning and M. Slavik
  Campylobacter jejuni can be difficult in the environment and extremely fragile, therefore carry-over between flocks has been difficult to explain. The aim of the study was to determine if the survival of C. jejuni outside the host could be due to a capability to form biofilms. In these experiments, C. jejuni was cultured under conditions of starvation, temperature variations, different cell concentrations, after passage through a chick gastrointestinal tract or with a conditioning film. However, no evidence of attachment and biofilm formation was found outside of growth conditions. Since growth conditions usually do not occur outside the host, it may be concluded that C. jejuni is most likely not a primary biofilm colonizer outside the host. These studies indicate that C. jejuni may utilize a strategy other than primary biofilm formation to survive outside the host.
  J.H. Metcalf , P.A. Moore Jr , A.M. Donoghue , K. Arsi , A. Woo-Ming , P.J. Blore , I. Hanning , S.C. Ricke and D.J. Donoghue
  To evaluate potential bacterial runoff from poultry litter, litter was applied to test plots and exposed to simulated rainfall 1, 8 or 15 d after litter application. Runoff samples were tested for Salmonella and Campylobacter, two bacterial pathogens commonly associated with poultry, as well as common fecal indicators such as coliforms, enterococci and Escherichia coli. The runoff samples were evaluated from treatments of no litter (control), or the equivalent of 1, 2 or 4 ton/acre of untreated poultry litter. Additionally, runoff samples from treatments of 2 tons/acre of alum-treated litter, 2 tons/acre composted litter and 2 ton/acre deep-stacked litter were compared for bacterial content. Three replicates of the treatments were performed, for a total of 21 test plots. No Campylobacter was isolated from any of the samples and the majority of samples tested negative for Salmonella. Although Salmonella was detected in runoff from many of the plots, it may have originated from sources other than the applied litter (rodents, birds, etc.) since it was detected in two of the unfertilized control plots.
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