fbpx
Sign up now!
Don't show this again

Thank you for confirming your subscription!

(And remember, if ever you want to change your email preferences or unsubscribe, just click on the links at the bottom of any email.)

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

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
POULTRY PORK
follow us


You must be logged in to edit your profile.

Favorites Read Later My Reports PHT Special Reports
Poultry 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

Sponsored By Zoetis

.
Featured Video Play Icon

Bioshuttle program helps control E. tenella outbreaks in pullets

Administration of an in-feed anticoccidial after coccidiosis vaccination has helped alleviate outbreaks of Eimeria tenella in broiler breeder replacement stock, Erin Riley, DVM, of Sanderson Farms, told Poultry Health Today.

For years, Sanderson has vaccinated its broiler breeder replacements against coccidiosis, which it “tempered” with 2 days of amprolium treatment, Riley said. In the past 2 years, however, there have been sporadic yet frequent breaks of E. tenella in the replacement birds, which was affecting livability as well as uniformity.

Broiler breeders are the company’s most expensive birds, and problems with uniformity can have a large economic impact, he noted.

Early coccidial cycling

The reason for the outbreaks, which tended to occur in late winter and early spring, wasn’t always obvious. Sometimes there was a glaring management issue, but other times, it wasn’t possible to pinpoint the problem. Studies, however, indicated high coccidial cycling from 10 to 14 days of age. “And I personally believe it’s a little too much cycling on that young of a bird,” Riley continued.

To try and remedy the problem, Sanderson decided to follow vaccination with an anticoccidial — a so-called bioshuttle program — which it has found useful in its broilers. For the pullets, it used the non-ionophore anticoccidial zoalene.

“We start small before we go big,” Riley said, so the company conducted paired house trials on two Mississippi farms to compare the vaccination/amprolium program with the bioshuttle program. The results were “a bit better” with the new program. Next, Sanderson tried the bioshuttle program in North Carolina, and “we had good success.”

Timing is important

Timing is important, he said. The in-feed anticoccidial has to be administered 4 to 5 days before clinical outbreaks of coccidiosis; otherwise it’s too late. The outbreaks at Sanderson occurred at 12 days of age — very early — so the zoalene program had to start at 8 or 9 days of age.

Although it is not an ionophore, Riley said, zoalene allows some leakage [when used at the lower end of its approved dose range] and in that way behaves similarly to an ionophore.

The goal is to make sure the bird gets the right amount of exposure to the disease.

“So, if we were to shut down oocyst cycling, it would reduce the bird’s exposure and very well would likely not allow the bird to get adequate immunity,” Riley explained. 

“And when they go to the breeder house, they very well could be exposed and succumb to E. tenella or other Eimeria species if they’re not adequately immunized.

“So, it’s a balancing act between getting enough oocysts present for immunity but not over-exposure.”




Posted on May 2, 2019

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.