Feed Strategy - July 2018 - 25
FeedStrategy ❙ 25
New evidence supports that, even with the
same genetics, some birds are Salmonella super
shedders and, thus, contribute to the majority of
infections. Kharkhan_Oleg | iStock.com
much as 1 million Salmonella by gram, while others
excrete none. Identifying those super shedders early
opens new options to deal with infections, to deal with
the real reservoir of pathogenic bacteria."
He estimates those super shedders account for between 5 and 10 percent of outbreaks.
This discovery will lead to new possibilities for
taking appropriate action.
antibiotic alternatives, which contribute to their feeding
strategy, i.e., probiotics, plant extracts and essential oils.
Geneticists have long been involved in building genetic
resistance. Meanwhile, it's in disease labs, like Velge's
in Tours, France, that the knowledge on super shedders
Researchers are now focused on strategies to anticipate, prevent and control infections as early as possible, e.g., at the hatchery.
First, they must understand how Salmonella infects
and persists in birds.
"In modern flocks, animals share the same genetics
and the same environment, thus we must find another
explaining factor," Velge said.
Recently, the European research project, Momir-PPC,
has discovered new evidence to support that the microbiome is distinct between super shedders and low shedders.
"We've been able to identify super-shedder chickens, to collect their intestinal flora, and to implant it in
chickens of another flock before any Salmonella infections," he said. "When chickens of one flock receive the
intestinal flora of the super-shedder ones, those ones
Introducing 'good' bacteria
to 'bad' microflora
The battle against pathogens is
being fought on many fronts. To
control infections, poultry producers
use vaccines, which are generally
not expensive but offer limited efficiency due to the wide diversity of
bacterial strains. While antibiotics
are effective, their use increases
the risk of antibiotic resistance and
contrasts with consumers' demand
for more for antibiotic-free meat production. For more than 20 years, the
feed industry has been developing
July 2018 ❙ www.WATTAgNet.com
Better understanding of Salmonella super-shedding birds will drive
researchers to propose new innovative solutions to poultry farmers,
reports Inra's Philippe Velge. Yanne Boloh