overview of ars on-farm research · s. cubana t10 s. cubana t8 s. mbandaka t38 s. knatum t39 s....
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Overview of ARS OnOverview of ARS On--farm farm ResearchResearch
J. Allen Byrd
Food Animal Protection Research LaboratoryFood Animal Protection Research LaboratoryUSDAUSDA--ARSARS
College Station, Texas, USACollege Station, Texas, USA
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Production Cost
Selling Price
Consumer Demands
Animal Welfare
Environmental Regulations
Food Safety
21st Century Decision Tree
Food Animal
Agriculture
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Preharvest Intervention Preharvest Intervention StrategiesStrategies
VaccinationVaccinationChemical or Biological Litter Treatment Chemical or Biological Litter Treatment Competitive Exclusion CultureCompetitive Exclusion CultureMedicationMedicationFeed WithdrawalFeed Withdrawal
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Areas of ConcernAreas of Concern
Feed millFeed mill
BreedersBreeders
HatcheryHatchery
Growout Growout
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Feed millFeed mill
Pelleting temperaturesPelleting temperaturesPest control Pest control Housekeeping Housekeeping SanitationSanitationLittle (if any) research is performed by Little (if any) research is performed by ARS ARS
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BreedersBreeders
Pest controlPest controlHouse SanitationHouse SanitationEgg Room ManagementEgg Room ManagementWater QualityWater QualityDocumentationDocumentationGeneral Practices General Practices Research by ARS Research by ARS ––Kogut, FFSRUKogut, FFSRU
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Background & HypothesisBackground & HypothesisCurrent selection Current selection Single pathogen resistanceSingle pathogen resistance
The hostsThe hosts’’ response in the earliest stage is critical in response in the earliest stage is critical in determining resistance or susceptibility.determining resistance or susceptibility.
The first week postThe first week post--hatch, poultry are highly hatch, poultry are highly susceptible to pathogens common in poultry facilities.susceptible to pathogens common in poultry facilities.
Our HypothesisOur Hypothesis•• Innate response drives acquired responseInnate response drives acquired response•• BroadBroad--spectrum resistancespectrum resistance•• Improve existing linesImprove existing lines
Dr. Kogut’s group, Avian Immunology
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Summary of Lines A & BSummary of Lines A & B
In vitro In vitro heterophil functionheterophil functionA > BA > B
In vivo In vivo challenges challenges ((SalmonellaSalmonella & & EnterococcusEnterococcus))A more resistant > BA more resistant > B
Genomic profile (innate immunity) Genomic profile (innate immunity)
A > BA > B
Dr. Kogut’s group, Avian Immunology
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Significance & ImpactSignificance & Impact1.1. Identified potential selection parametersIdentified potential selection parameters
Line levelLine levelChicks from a single damChicks from a single damIndividual adult breedersIndividual adult breeders
2.2. Select for high responders in lowerSelect for high responders in lower--responding lines responding lines
3.3. Development of new immunologically Development of new immunologically competent lines competent lines
4.4. Improve valuable existing linesImprove valuable existing lines
Dr. Kogut’s group, Avian Immunology
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Where are we now?
parental lines improve line B
screen progeny
in vitroHΦ function identify
high/low sires
innate immunity profile
in vivochallenges
screen line B sires
Dr. Kogut’s group, Avian Immunology
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HatcheryHatchery
SanitationSanitationPest ControlPest ControlBiosecurityBiosecurityWater ControlWater ControlChick Box Pads ManagementChick Box Pads ManagementHatchery Cabinet InterventionsHatchery Cabinet InterventionsARS ResearchARS Research-- Athens GroupsAthens Groups
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GrowoutGrowout
Pest Control Pest Control House SanitationHouse SanitationFarm BiosecurityFarm BiosecurityWater Quality/TreatmentsWater Quality/TreatmentsARS Research ARS Research ––Fayetteville, Athens, & Fayetteville, Athens, & College StationCollege Station
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Poultry Production and Product Safety Poultry Production and Product Safety Research Unit, Fayetteville, ARResearch Unit, Fayetteville, AR
Salmonella Salmonella ResearchResearch--
Identify mechanisms by which Identify mechanisms by which stressors suppress immunity to stressors suppress immunity to pathogens in turkeyspathogens in turkeys
Determine if joint and bone Determine if joint and bone infections are an overlooked infections are an overlooked source of product and source of product and processing plant contaminationprocessing plant contamination
Development of alternative approaches to antibiotics for controlling bacterial pathogens in poultry
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Salmonella Salmonella ResearchResearch--
Bacteriophage therapyBacteriophage therapylaboratory studies demonstrate reduction of laboratory studies demonstrate reduction of SalmonellaSalmonella post harvestpost harvest
ProbioticsProbioticsin vitroin vitro selection for selection for in vivoin vivo competition against competition against pathogenspathogens-- discovery licensed, 100 million turkeys discovery licensed, 100 million turkeys and chickens treated internationally last yearand chickens treated internationally last year
Soil AmendmentsSoil AmendmentsAlum (aluminum sulfate) 10 patents related to improving Alum (aluminum sulfate) 10 patents related to improving poultry productionpoultry production
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Recovery of Recovery of SalmonellaSalmonella from Commercial turkey from Commercial turkey Carcasses rinsed with Control or 72 Bacteriophage Carcasses rinsed with Control or 72 Bacteriophage
Isolates Amplified in SE Host or Field IsolateIsolates Amplified in SE Host or Field Isolate
0102030405060708090
100
Control SE S14 SE + S14
20/30
3/30
a
b
Perc
ent %
2/305/30
bb
Salmonella host used to propagate Bacteriophagea-b Different superscripts indicate significant (p<0.05) differences in incidence.
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Impact of Alum ResearchApproximately 600 million chickens are grown using alum/year
Ammonia reduction and pathogen control are the primary reasons poultry producers are using alum although the initial goal was controlling P runoff.
Saves poultry industry $5-10 million per year
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NR
NO3- NO2
-
ClO3 ClO2
Intracellular
Extracellular
UQ
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1010
1011
1012MPN controlMPN chlorate
Rum
en
Cec
um
Rec
tum
Tota
l Cul
tura
ble
Ana
erob
es(M
PN/g
inte
stin
al c
onte
nts)
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Chlorate effects in continuous Chlorate effects in continuous cultureculture
pHpHA:P ratioA:P ratioTotal culturable Total culturable anaerobic bacteriaanaerobic bacteriaTotal VFATotal VFANHNH33 productionproductionCHCH44 productionproductionAll unchangedAll unchanged1
100
104
106
108
1010
1012
0 50 100 150 200
Con
cent
ratio
n C
FU/m
l
Time (h)
Beneficial anaerobes
E.coli O157:H7
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Pure culture Mixed fecal culture
10
1000
105
107
109
1011
10 mM Chlorate0 mM Chlorate
0 50 100 150 200
933
CFU
ml-1
a
E. c
oli
Time (h)
1
100
104
106
108
1010
1012
0 50 100 150 200
MPN/10 mM ChlorateMPN/0 mM Chlorate
M
PN m
l-1 T
otal
cul
tura
ble
anae
robe
sTime (h)
b
-1 o
rE.
col
iE.
Col
i93
3 C
FU m
l-1or
(Continuous culture)Time (h) Time (h)E. C
oli O
157:
H7
933
CFU
ml-1
10 mM Chlorate
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Experimental Chlorate Product Experimental Chlorate Product (ECP)(ECP)
DayDay--ofof--hatch Broiler chickshatch Broiler chicks–– 1x ECP (48 hour)1x ECP (48 hour)
Reduced cecal Salmonella 99.99% (32,400 Reduced cecal Salmonella 99.99% (32,400 2)2)
Preharvest BroilersPreharvest Broilers–– 1x ECP (48 hour)1x ECP (48 hour)
Reduced crop Salmonella 95% (36.7% Reduced crop Salmonella 95% (36.7% 1.7%)1.7%)Reduced cecal Salmonella 40% (53% Reduced cecal Salmonella 40% (53% 31.7%)31.7%)Reduced cecal E.coli 1 Log (6 Reduced cecal E.coli 1 Log (6 5)5)
Byrd et al, 2002
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Evaluation of CE and Evaluation of CE and ECPECP on Nonon Non--Challenged Broiler ChicksChallenged Broiler Chicks --
CONTACTSCONTACTS
Exp. Groups (+/total) Log 10 ST
Control 33/39 (84.6%)A 3.94 (8710)A
CE 13/39 (33%)B 1.31 (20)B
ECP – 1x 7/40 (15%)B 0.42 (3)C
ECP- 1x + CE 1/40 (2.5%)C 0.07 (1)C
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Effect of 38 Hour Experimental Chlorate Product (ECP) Treatment Provided Prior to Feed Withdrawal on Salmonella Ceca Colonization in Commercial Turkeys
Treatment Log10Salmonella
Salmonella(Pos/Total)
Control 14/40 (35%)A
4/40 (10%)B
0/40 (0%)B
3x ECP 0.14 + 0.11B 3/40 (7.5%)B
1x ECP
2x ECP
0.95 + 0.31A
0.27 + 0.19B
0.00 + 0.00B
Twelve Hour Feed Withdrawal, Ten Hour Water Withdrawal *P< 0.05
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Evaluation of Evaluation of ECPECP as a Feed Supplement for 7 as a Feed Supplement for 7 days on days on SalmonellaSalmonella ceca colonization in broiler ceca colonization in broiler
Treatment Salmonella Pos per total
Log10Salmonella/mL
Control 14/20 (70%)a 2.27 + 1.69ab (186)
0.3% ECP 11/20 (55%)a 1.76 + 1.73b (57)
3.1% ECP 13/20 (65%)a 2.15 + 1.73ab (141)
11.1% ECP 4/20 (20%)b 0.47 + 1.01c (3)
6.2% ECP 5/20 (25%)b 0.63 + 1.17c (4)
**Significantly different from control at P< 0.05
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Residue in Broiler TissueResidue in Broiler Tissue
David J. Smith, Fargo, ND, 2006
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Salmonella SerotypingSalmonella Serotyping
Conventional methods to identify Salmonella serotypes are time consuming, labor intensive, and expensive.
We are examining the utility of 16S/23S ribosomal DNA spacer region polymorphisms (Bakshi et al., 2002) to identify Salmonella serotypes among poultry isolates.
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S. kentucky T66 S. kentucky T67 S. kentucky T26 S. kentucky T27 S. albany T43 S. soerenga T51 S. soerenga T52 S. 6,8,1,2 monophasic S. bredeney T48 S. hadar B97 S. 3,10,1 monophasic S. unknown T54 S. kentucky B94 S. untypable T64 S. senftenberg T11 S. senftenberg T12 S. cubana T9 S. cubana T10 S. cubana T8 S. mbandaka T38 S. knatum T39 S. mbandaka T36 S. mbandaka T37 S. havana T33 S. havana T34 S. havana T35 S. newport T18 S. tennesseeT20 S. cerroT6 S. barranquilla T4 S. senftenberg T13 S. oranienburg T42 S. typhimurium K75 S. anatum T1 S. anatum T2 S. anatum T3 S. dublin T29 S. copenhagen T31 S. quakumT40 S montevideo T14 S. montevideo T16 S montevideo T15 S. cerro T30 S. barranquilla T5 S. copenhagen T32 S. tennessee T21 S. tennessee T22 S. oranienburg T41 S. newport T17 S. newport T19 S. meleagridis T23 S. cerroT7 S. lillie K88 S. beita K89 S. copenhagen T28 S. heidelberg B91 S. senftenberg B93 S. hadar K83 S. heidelberg K81 S. heidelberg K82 S. infantis K76 S. braenderup K77 S. 4,5,12:i monophasi S. 4,5,12:i monophasi S. dublin T46 S. dublin T47 S. untypable T62 S. enteritidis B95 S. typhimurium B96 S. 4,12,2 monophasic S. untypable T60 S. untypable T61 S. give T68 S. give T69 S. give T70 S. ohio K73 S. taksony K90 S. agona K72 S. 3,10,1 monophasic S. untypable T63 S. agona T71 S. worthington K84 S. adelaide K87 S. untypable T65 S. schwarzengrund K86 S. oranienburg K74 S. unknown T55 S. bredeney T49 E. coli H1A E. coli H5A S. montevideo B92 S. soerenga T50 S. albany T45 Clostridium perfringen 1 Clostridium perfringen 4 VRE H1A VRE H5A C. coli C. coli C. jejuni
10080604020
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FlavomycinFlavomycin
Used in chickens and swine to promote Used in chickens and swine to promote growthgrowthPhosphoglycolipid antibiotic Phosphoglycolipid antibiotic Active against Gram positive bacteriaActive against Gram positive bacteriaIs not absorbed from the gutIs not absorbed from the gutNothing similar to flavomycin is used in Nothing similar to flavomycin is used in human medicinehuman medicineNo known mechanism of resistance No known mechanism of resistance
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In vitroIn vitro conjugation with Flavomycinconjugation with Flavomycin
0
12
345
6
7
8
0 8 16 24 32 40 48 56 64 72Flavomycin concentration mg/L
Log
10 C
FU/m
l
Pre onlyPre+conjConj. only
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Proposed FFSRU Salmonella Proposed FFSRU Salmonella Poultry ResearchPoultry Research
Identify environmental and management Identify environmental and management influences that contribute to the influences that contribute to the colonization of foodcolonization of food--borne pathogens.borne pathogens.–– Newly constructed broiler houseNewly constructed broiler house
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Where FFSRU is headed in Poultry Where FFSRU is headed in Poultry Research ContinuedResearch Continued
Identify prebiotics and symbiotics Identify prebiotics and symbiotics –– LactoseLactose–– ChlorateChlorate–– CottonseedCottonseed–– Quorum sensingQuorum sensing
Identify environmental and management influences that Identify environmental and management influences that contribute to the antibiotic resistancecontribute to the antibiotic resistance–– FlavomycinFlavomycin
Characterize the complex interaction between the Characterize the complex interaction between the immune and endocrine systems and their role in food immune and endocrine systems and their role in food safety. safety. –– Endocrine assayEndocrine assay–– Endocrine in vitro model (epithelial cells)Endocrine in vitro model (epithelial cells)
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PrePre--harvest Research at ARSharvest Research at ARS
A broad research area being addressed by a A broad research area being addressed by a diverse group of scientists in many locations.diverse group of scientists in many locations.
Many others in ARS are studying preMany others in ARS are studying pre--harvest harvest epidemiology and developing intervention epidemiology and developing intervention strategies in poultry. The knowledge gained in strategies in poultry. The knowledge gained in these studies may impact the overall health of these studies may impact the overall health of poultry as well as food safety issues that may poultry as well as food safety issues that may influence future applications in the preinfluence future applications in the pre--harvest harvest poultry research.poultry research.
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