Tap to download the app
X
Share
X

REPORTS

Collect articles and features into your own report to read later, print or share with others

Create a New Report

Favorites

Read Later

Create a new report

Report title (required) Brief description (optional)
CREATE
X
NEXT
PORK POULTRY
follow us


You must be logged in to edit your profile.

Favorites Read Later My Reports PHT Special Reports
Pig Health Today is equipped with some amazing (and free) tools for organizing and sharing content, as well as creating your own magazines and special reports. To access them, please register today.
Sponsored by Zoetis

Pig Health Today | Sponsored by Zoetis

.

Print

Flushing feed mill with treated rice hulls reduces PEDV risk

The porcine epidemic diarrhea virus (PEDV) taught swine veterinarians and producers many hard lessons about feed management. Not only can the deadly virus be transported by feed ingredients, PEDV also can contaminate subsequent batches of feed due to carryover on feed-contact surfaces.1

Although washing and disinfecting is an effective decontamination method, it’s not practical for commercial feed production. So, a team of researchers from Kansas State and Iowa State universities evaluated chemically treated rice hulls as a more practical solution. Rice hulls were chosen due to their abrasiveness, excellent adsorption and relatively low cost, pointed out Jordan Gebhardt, Kansas State University PhD graduate student in swine nutrition.

The rice hulls were treated with 0.325% formaldehyde, 2% medium-chain fatty acids (MCFA), 10% MCFA or left untreated as a control comparison. A PEDV-contaminated batch of feed was mixed in eight laboratory-scale mixers, followed by one of the four flush treatments. Two replicates were conducted per treatment.

For a larger-scale perspective, PEDV-contaminated feed was manufactured through a 50-kg mixer, followed by a 10%-MCFA-treated rice hull flush. Researchers then mixed another batch of feed.

Contaminated feed and flush samples were tested for PEDV presence. Infectivity was tested through 10-day-old pigs.

The researchers presented a poster at the 2017 American Association of Swine Veterinarians’ meeting in Denver showing their results. For the laboratory-scale mixers, half of the untreated rice hull flushes had detectable PEDV, as did one of six formaldehyde-treated rice hull and two of the 2%-MCFA rice hull flushes. No PEDV was found following the 10%-MCFA rice hull flush. For the larger-scale mixer, no PEDV was detected following the flush or in the next batch of feed.

“PEDV-contaminated control feed transferred infection to the pigs, but the feed processed after the chemically treated rice hull flushes did not,” Gebhardt said.

Researchers also looked at the dust resulting from feed mixing. They found that the contaminated control feed produced contaminated dust and that the PEDV was infective. The 10%-MCFA rice hull flush reduced the PEDV load and the related dust was not infective.

The researchers concluded: “Chemically treated rice hull flushes reduced the quantity of detectable PEDV and potential infectivity in feed, and the 10%-MCFA treatment eliminated PEDV infectivity in dust.”

 

 

 

 

1 Gebhardt J, et al. Evaluation of the Effects of Flushing Feed Manufacturing Equipment with Chemically Treated Rice Hulls on PEDV Cross Contamination During Feed Manufacturing. Poster presented at the 48th American Association of Swine Veterinarians’ Annual Meeting. 2017;241.

 

 


tags: , , ,
RELATED NEWS
  • PEDV and other pathogens survive in feed for weeks

    In 2013-2014, infection of pig farms with PEDV was a frequent event, even in farms using the highest level of biosecurity. In an effort to determine how this could happen, Scott Dee, DVM, began investigating.

  • Survey identifies gaps in employee biosecurity practices

    For biosecurity to be effective, everyone working within the farm needs to understand and comply with the defined protocols. In reality, a person’s attitude can make or break the outcome, so it’s important that the on-farm staff view biosecurity as a priority.

  • Want better biosecurity? Start with your pig trailers

    Improving transportation biosecurity may be the last frontier the swine industry needs to conquer to help prevent the spread of infectious diseases. According to Butch Baker, DVM, the spread of porcine circovirus type 2 was transport-related, and for years it’s...

  • Tougher surveillance needed to control PED risk in Canada

    The Canadian government is being urged to introduce tougher surveillance and containment measures to help limit the spread of porcine epidemic diarrhoea (PED) across Canada.




You must be logged in to edit your profile.

Google Translate is provided on this website as a reference tool. However, Poultry Health Today and its sponsor and affiliates do not guarantee in any way the accuracy of the translated content and are not responsible for any event resulting from the use of the translation provided by Google. By choosing a language other than English from the Google Translate menu, the user agrees to withhold all liability and/or damage that may occur to the user by depending on or using the translation by Google.