fbpx
Sign up now!
Don't show this again
Sweepstakes Rules

We’re glad you’re enjoying Poultry Health Today.
Access is free but you’ll need to register to view more content.
Already registered? Sign In
Tap to download the app
X
Share
X
REPORTSCollect 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
POULTRY
follow us


You must be logged in to edit your profile.

Sponsored by Zoetis

Sponsored By Zoetis

.
Playicon

Direct-fed microbials can impact Salmonella vaccine efficacy

Some direct-fed microbial additives with live cultures have been found to impact the efficacy of modified-live vaccines.

Sanderson Farms’ Phil Stayer, DVM, said the firm made the findings relatively recently as part of work to reduce Salmonella levels on poultry going into processing plants.

The USDA’s Food Safety and Inspection Service is targeting processors to reduce Salmonella levels, and a vital part of that strategy is implementing on-farm interventions to reduce the load going into slaughterhouses.

Live vaccines are playing an essential role in this, as are in-feed and in-water additives that have been developed to help.

But Sanderson Farms found some direct microbials not only have an effect on wild Salmonella but also the strains introduced as part of vaccinations.

“It has to do with the Salmonella that’s going to have a niche in the birds, whether it’s a wild strain or it’s vaccine strains,” Stayer told Poultry Health Today.

“So, it’s something a direct [fed] microbial, which is a microbial population that inhabits that space, prevents wild-strain Salmonella from inhabiting that space, and it will do the same for a modified-live strain.”

The timing of administration appears to have an impact, he added. “We do know that simultaneous applications can be problematic.

“We think that if you get your modified-live vaccine in early and then immunity is established, then maybe you can do direct microbial after that. But we don’t know that timing just yet.”

At present, feed scheduling offers an opportunity to phase in microbials after first offering birds a live-vaccine program.

“So, like our breeding stock will have a starter feed for 4 weeks. That first 4 weeks we’ll probably focus on a vaccine, not direct-fed microbials,” Stayer said.

“Otherwise, in broilers, we’ll change feed after 2 weeks of age, and so that first feed probably wouldn’t have a direct-fed microbial in it.”

It forms part of what Stayer described as a “shotgun approach” to Salmonella control — where a lot of interventions take place, with new ones trialed all the time. Working out which are most effective, however, is a challenging thing to do.

“It’s really hard to measure any one of those effects,” he explained. “We’ve tried, and we’ve used data analytics to look at when we’ve started things [and] when we’ve stopped things, we’ve changed things, and still, it’s a mountain of [confusing] data to go through.”

Shareicon Pht 1
Share It
Some direct-fed microbial additives with live cultures have been found to impact the efficacy of modified-live vaccines. Watch the interview with Sanderson Farms' Phil Stayer, DVM.

Click an icon to share this information with your industry contacts.



Posted on September 22, 2021

tags: , , ,
RELATED NEWS



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.