An Optimist s View on How We Will Maintain Broiler Gut Health and Performance in Today s NAE, Food Safety and Regulatory Climate
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1 An Optimist s View on How We Will Maintain Broiler Gut Health and Performance in Today s NAE, Food Safety and Regulatory Climate Chuck Hofacre, DVM, MAM, PhD The University of Georgia And Southern Poultry Research Group
2 Why I am Optimistic! 1957 Broiler 1977 Broiler 2005 Broiler Source: Renema et al, 2006
3 Agriculture Has Become Highly Regulated Welfare Standards Food Safety Regulations Antimicrobial Stewardship Environmental Regulations
4 Welfare Standards Customer Driven Bird Density Lighting programs intensity, duration Slow Growth vs. Modern Genetics
5 Environmental Regulations State and Federal Government Driven Litter Disposal seasons, weather, run off Nutrient management plans - Phosphorous Air quality ammonia emissions??
6 Food Safety Regulations Federal Government - Administration Obama vs. Trump?? - CDC - FSIS - FDA (FSMA & S.E. Egg Rule) Consumer Advocate Groups International Trade Partners - Codex Alimentarius (joint WHO/FAO)
7 Antimicrobial Use Stewardship Federal Government -FDA -CDC Customers (not consumers) Export Markets
8 Why do we grow broilers?
9 Why? Fun, great lifestyle!
10 Why? Make Money
11 Why? Feed the World!
12 Antimicrobial Stewardship Regulations March 2009 FDA Guidance #120 Control unnecessary use of antimicrobials Veterinary Feed Directive June 2010 FDA Guidance #209 Judicious use of medically important antimicrobials in food animals Remove label for promoting growth or improving feed efficiency December 2010 FDA Guidance #213 New Labels no production/performance indication Use veterinary oversight for both in feed and water Began January, 2017
13 What does this mean? Feed Additive Compendium, 2015
14 World s Changing - Antimicrobial Stewardship No longer use ceftiofur (Naxcel) No extra label Reduced/eliminate gentamicin use (Medically Important) Market driven less AGP Use -NAE -ABF VFD/Prescriptions
15 Raising Chickens without Antibiotics Consumers want it! QSRs want it! Retailers want it! They are willing to pay more
16 Dos and Don ts of ABF in a Broiler Company When you start Piece of cake 100% of production sold ABF = Bad Chick quality is critical!
17 What I Have Experienced NE more severe in winter Can be as much as 30-50% of houses placed Often farms with poorer husbandry
18 More Experience When on Coccida vaccine 16.3 days of age (372 cases) Earliest 11 days and oldest 28 days Clean/new litter a risk factor (37% of cases) J. Smith
19 More Experience Vaccines in U. S. Coccivac, Advent, Inovocox, Hatch Pak *No difference in NE incidence Combine vaccine and chemical coccidiostat 14 day minimum downtime Greater square footage
20 More Experience Subclinical N. E. can lose 4 points (1.66 to 1.70/3.25kg) Feed passage up to 15% is normal, starts in second feed All veg diet a problem
21 Feeding Program Feed changes at wrong time Disaster -18 days o.k. Higher protein early = higher N. E. Want highly digestible protein early Welfare programs may clash with ABF -i.e. 6 hours continuous darkness?? Phytase and rickets??
22 More Experience 1. Egg Pack is critical 2. Chick Quality is critical 3. If 1 & 2 perfect without Gentamicin 0.5% higher first week 4. If 1 & 2 less than perfect Happy at 3.5% average first week
23 More Experience (Number of Cases January 2016 March 2016) Chick Quality 14% N. E./Cocci 27% Respiratory 13% GD 12% IBH 7% BCO 5% Unknown 10%
24 Clostridium perfringens Soil organism Anaerobe forms highly resistant spores Normal flora Alpha, beta and Net B toxins Toxins or digestive enzyme??
25 Alpha-Toxin Production Increased growth of C. perfringens (8-10 minute generation time) Intestinal Damage by coccidia infection N. E. Intestinal T-cell Immune response Releases cytokines TNF/IFN C. perfringens produces mucolytic enzymes Increased mucus production by goblet cells Cytokines activate Mucin gene of goblet cells Collier, et al. Vet Inf & Immun. 122:
26 X Coccidia Healthy Intestine T-cell Inflammatory Response Mucolytic bacteria X Ionophore (antibiotic) Toxin A Production X C. perfringens Crypt Goblet Cell # and Cell size
27 T-RF peak areas (%) Bacteria composition of the Ileum 100% 90% 80% 70% 60% 50% 40% 30% Proteobac Bacteroides Streptococcus Enterococcus C. lituseburense C. irregularis Clostridium spp. 20% 10% 0% corn wheat probiotic antibiotic monensin L. crispatus L. acidophilus Lactobacillus spp.
28 Day 0 Day 14 Day 18 Day 22 Day 28 Day 35 Day 42 Oocyst Shedding Pattern following Coccivac-B Vaccination Chickens vaccinated on day of hatch Oocyst shedding peaks As immunity develops, the number decrease Damage to mucosa from 7 to 22 days with major damage ~ 18 to 21 days Oocyst 1 x (Mathis, 2001)
29 % Necrotic Enteritis Mortality No Cocci CP only EA EM EA/EM
30 Prevent Necrotic Enteritis 1. Control intestinal epithelium damage ingredient quality Coccidia 2.Prevent toxigenic strains of C. perfringens from multiplying Ingredient types Use of enzymes 3. Maintain Healthy Intestinal Microbial Flora
31 N.E. Interventions Tested That Work: Enzymes i.e. Phytase, Amylase, etc. Prebiotics (MOS) Probiotics (Defined/undefined) Organic acids Inorganic acids Phytoceuticals (essential oils, Saponins, etc.) Immune stimulants/modulators Combination of above
32 Intersection of Antibiotic Stewardship Food Safety Animal Welfare
33 Does Antibiotic Use Impact Food Safety?? S.M. Russell UGA, 2003 Study 1: Airsacculitis - 96% carcasses questionable or unacceptable E. coli levels Study 2: Airsacculitis + = 70% + Salmonella Airsacculitis - = 40% + Salmonella Study 3: Random selected carcasses Airsacculitis + flock - Higher Campylobacter - Higher E.coli - Greater intestinal tract tears (poorer B.W. uniformity)
34 Intersection of Antimicrobial Stewardship Food Safety Animal Welfare Small intestine Lactobacillaceae(68.5%) Clostridiaceae(9.7%) Bacillus(0.7%) Streptococcaceae(6.7%) Enterococcaceae(6.5%) Actinobacteria(0.9%) Alpha(0.2%) Beta(0.9%) Epsilon(0.9%) Delta(0.5%) Bacteroidaceae(0.6%) Cecum Lactobacillaceae(8.5%) Clostridiaceae(67.7%) Bacillus(1.5%) Streptococcaceae(0.7%) Enterococcaceae(1.0%) Actinobacteria(14.3%) Alpha(0.8%) Beta(0.7%) Gamma(1.3%) Flavobacteriaceae(0.2%) Bacteroidaceae(5.1%) Unknown bacteria(1.1%) Microbial Composition of the Broiler Intestine (16S clone libraries)
35 Interventions Tested Work Only for N.E.? Enzymes i.e. Phytase, etc. Prebiotics (MOS) Probiotics (Defined/undefined) Organic acids Inorganic acids Phytoceuticals (essential oils, Saponins, etc.) Immune stimulants/modulators Combination of above Also, Salmonella and Campylobacter (?)
36 Eimeria and Food Safety Eimeria cycling affects the gut flora or local immune response? Collier, choice of coccidiosis control. important for control of Salmonella. (Volkova, et al. 2011: 66 Broiler flocks) E. tenella results in increased colonization and fecal shed of Salmonella Tellez, P. S found increased resistance to S. E. following subclinical Eimeria tenella Baba,1987 E. tenella S. T. spleens/livers: Salmonella in MSP/MDM/Ground Poultry??
37 Day 13 Day 19 Day 25 Day 31 Day 37 Intersection of Antibiotic Use Food Safety Animal Welfare: Coccidia Salmonella Prevalence Ceca* (42 day) 100% 80% 60% 40% 20% 69% 51% 68% *10 ceca/pen x 8 replicates **Not significantly different Salmonella Prevalence (%) Why Does Cocci Affect Salmonella? 18,000 16,000 14,000 12,000 10,000 8,000 6,000 4,000 2,000 0 Occyst Counts (E. acervulina/e. tenella) Coccivac B Ionophore
38 Breeder Pullets This Optimist Believes in the Integrated Poultry Industry Breeder Layer Broiler Eggs Broiler Hatchery Broiler Farm Processing Plant Consumer
39 Optimists Goal for Poultry Industry Fun and a Great Lifestyle Feed the World Make Money 6 Week Old Broiler: 1957 vs J. Wilson, 2012
40 How We Will Maintain Broiler Gut Health and Performance in Today s NAE, Food Safety and Regulatory Climate Team A Group on one side. Webster s New Collegiate Dictionary NAE, ABF: Partner with Growers!
41 Thank you John Smith and Greg Mathis
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