Poultry International - December 2017 - 13

PoultryInternational ❙ 13

Governments around the globe are trying to find
ways to maintain the efficacy of existing antibiotics while encouraging the development of new
antibiotics.
The One Health approach that has been adopted to combat antimicrobial resistance looks at
antibiotic use in humans and food animals. The
marketplace now sees elimination of antibiotic
use in poultry husbandry as a virtue, but will this
change actually improve efficacy of antibiotics in
human medicine?

Dr. Charles Hofacre, president, Southern
Poultry Research Group, and professor emeritus, University of Georgia College of Veterinary
Medicine, said the National Antimicrobial
Resistance Monitoring Study (NARMS) provided
funding for research looking at antimicrobial
resistance in the microflora of Salmonella and

Read more about
on-farm antibiotic use and
antimicrobial resistance at:

Will removal of antibiotics reduce
resistance?
There haven't been a lot of studies looking
specifically at the impact of no-antibiotics-ever
growing programs for poultry on antimicrobial
resistance of the microflora in the poultry house,
according to Dr. Rolf Joerger, associate professor, department of animal and food sciences,
University of Delaware. He said there has been
some work done comparing antimicrobial resistance in bacteria on organic and conventional
broiler farms. So far, he said, these studies have
shown very little change in the level of antibiotic
resistance in the pathogens.
"Right now, it is not completely clear if going
to organic growing practices (which include no
antibiotics ever) changes antimicrobial resistance
in the short term, say within a few years," he
said. 
Joerger explained that many of these studies
just look at pathogens, not at all of the microbiota. He said that if you just look at pathogens,
there aren't that many of them, so your sample
size is usually fairly small.
He said that if there will be a reduction in antimicrobial resistance in the poultry house that it
may take years to develop, because the bacteria
have been in the poultry house for a long time,
particularly with built-up litter systems. Joerger
suggested that these bacteria may persist because
they were adapted to that house environment.
December 2017 ❙ www.WATTAgNet.com

Bigstock, kgtoh

http://www.wattagnet.com/
articles/27560-us-livestockantibiotic-policy-may-promoteresistance

Campylobacter found in broiler houses. Hofacre
and Dr. Randall Singer, professor of epidemiology, department of veterinary and biomedical
sciences, University of Minnesota, conducted the
research, which continued after Hofacre's retirement from the university.
In this field study, environmental samples
were collected by wearing a sock over disposable boots and walking in the poultry house.
Salmonella and Campylobacter were isolated and
cultured from the samples and then were tested
for antibiotic resistance according to the NARMS
protocol. Birds raised in conventional and noantibiotics-ever growing programs are included
in the study, but the study commenced when noantibiotics-ever growing programs were a small
niche part of the industry. Results for the study
have not been published yet.

The problem of coselection and
coresistance
Plasmids are small DNA circles outside the
bacterial chromosome. Some bacteria can have
plasmids that contain genes that provide resistance to more than one class of antibiotics or met-


http://www.wattagnet.com/articles/27560-us-livestock-antibiotic-policy-may-promote-resistance http://www.WATTAgNet.com

Table of Contents for the Digital Edition of Poultry International - December 2017

Poultry International - December 2017
Contents
Editor’s Comment
News
African chicken production future bright but challenging
100TH YEAR SERIES: Will no-antibiotics-ever poultry improve human health?
How the world’s top chicken producers are investing
5 poultry programs you don’t want to miss at 2018 IPPE
CO2-neutral egg farm opens in the Netherlands
3 tools to control reactivated Salmonella in poultry feed
How broiler super pre-starter diets impact bird growth
Improve broiler carcass quality by minimizing fl apping
Products
Marketplace
Ad Index
Poultry International - December 2017 - CT1
Poultry International - December 2017 - CT2
Poultry International - December 2017 - Poultry International - December 2017
Poultry International - December 2017 - Cover2
Poultry International - December 2017 - Contents
Poultry International - December 2017 - Editor’s Comment
Poultry International - December 2017 - 3
Poultry International - December 2017 - News
Poultry International - December 2017 - 5
Poultry International - December 2017 - African chicken production future bright but challenging
Poultry International - December 2017 - 7
Poultry International - December 2017 - 8
Poultry International - December 2017 - 9
Poultry International - December 2017 - 10
Poultry International - December 2017 - 11
Poultry International - December 2017 - 100TH YEAR SERIES: Will no-antibiotics-ever poultry improve human health?
Poultry International - December 2017 - BB1
Poultry International - December 2017 - BB2
Poultry International - December 2017 - 13
Poultry International - December 2017 - 14
Poultry International - December 2017 - 15
Poultry International - December 2017 - How the world’s top chicken producers are investing
Poultry International - December 2017 - 17
Poultry International - December 2017 - 5 poultry programs you don’t want to miss at 2018 IPPE
Poultry International - December 2017 - 19
Poultry International - December 2017 - CO2-neutral egg farm opens in the Netherlands
Poultry International - December 2017 - 21
Poultry International - December 2017 - 22
Poultry International - December 2017 - 23
Poultry International - December 2017 - 3 tools to control reactivated Salmonella in poultry feed
Poultry International - December 2017 - 25
Poultry International - December 2017 - 26
Poultry International - December 2017 - 27
Poultry International - December 2017 - How broiler super pre-starter diets impact bird growth
Poultry International - December 2017 - 29
Poultry International - December 2017 - 30
Poultry International - December 2017 - 31
Poultry International - December 2017 - 32
Poultry International - December 2017 - 33
Poultry International - December 2017 - Improve broiler carcass quality by minimizing fl apping
Poultry International - December 2017 - 35
Poultry International - December 2017 - 36
Poultry International - December 2017 - 37
Poultry International - December 2017 - Products
Poultry International - December 2017 - Marketplace
Poultry International - December 2017 - Ad Index
Poultry International - December 2017 - Cover3
Poultry International - December 2017 - Cover4
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