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Precautionary Moratorium on New Concentrated Animal Feed Operations
Policy Date: 11/18/2003
Policy Number: 20037
An estimated 54 percent of U.S. livestock are now concentrated on 5 percent of livestock farms,1 with the largest of such farms getting larger;2 and these industrial-scale, concentrated animal feeding operations (CAFOs) which are, according to Environmental Protection Agency (EPA) criteria, facilities with more than 1,000 beef cattle, 2,500 hogs or 100,000 broiler hens now dominate U.S. livestock and poultry production; and
Increased numbers of CAFOs in an area often are associated with declines in local economic and social indicators (e.g., business purchases, infrastructure, property values, population, social cohesion), which undermine the socioeconomic and social foundations of community health,3 particularly in poor and African American rural communities;4,5 and
CAFOs generate an estimated 575 billion pounds of animal manure yearly.6 CAFO generated manure has constituents and byproducts of health concern including heavy metals, antibiotics, pathogen bacteria, nitrogen and phosphorus, as well as dust, mold, bacterial endotoxins and volatile gases; CAFO-generated manure being uneconomical to transport for any distance,7 it is typically stored in open or covered pits or lagoons and later spread or sprayed untreated on nearby cropland, posing additional risks to public health; and
Manure pathogens capable of causing severe gastrointestinal disease, complications, and sometimes death in humans include Campylobacter and Salmonella species, as well as Listeria monocytogenes, Helicobacter pylori, and E coli O157:H7, and the protozoa Cryptosporidium parvum.8 Runoff from manure-applied fields can carry human pathogens into surface waters, which often serve as drinking water sources. Epidemiology studies have, in fact, linked several outbreaks involving these pathogens to livestock waste;9 and
Manure land application in excess of the land’s absorptive capacity also can lead to excess nitrogen and phosphorus in soil,10 eutrophication of surface waters and algae overgrowth——including some algaes producing human toxins;11-13 and
The emerging scientific consensus is that antibiotics given to food animals contribute to antibiotic resistance transmitted to humans.14,15 Antibiotics, as well as arsenic and other metal compounds,16 -18 are routinely added to the feeds of concentrated animals absent any diagnosed illness——to promote growth and to compensate for the stress of raising animals under confinement——increasing the risks from antibiotic resistance.19,20 These routine, non-therapeutic animal uses account for an estimated 13 million pounds of antibiotics annually, most being identical or very similar to human medicines, as compared to 3 million pounds of antibiotics prescribed for humans.21 Current APHA Policy (Nos. 9908 and 00-LB-5) registers appropriate concern about agricultural use of these medically-important antibiotics;22,23 and
An estimated 25–75 percent of feed antibiotics pass unchanged into manure waste, posing additional risks to soil, water and air quality and public health following land application.24 Pig house dust, in a recent study, was found to contain total antibiotics at a concentration of up to 12.5 mg/kg dust with up to five separate compounds, including tylosin, tetracyclines, sulfamethazine, and chloramphenicol;25 and
In several states, storage pits or lagoons legally can leak millions of gallons of liquid manure,26-28 and often spill or burst.29,30 They are frequently sited on floodplains, below the water table or over alluvial aquifers (formations favored as drinking water sources but more easily subject to microbial contamination);31 and
CAFO manure wastes also include organic dust, molds, bacterial endotoxins and manure-generated gases of up to 400 separate volatile compounds, such as ammonia and hydrogen sulfide, many of which are known airway irritants, allergens or respiratory hazards;32 -34 and
Numerous studies document serious respiratory problems among CAFO workers, including chronic bronchitis and non-allergic asthma in about 25 percent of confinement swine workers.35,36 Workers exposed to the potent neurotoxin hydrogen sulfide at levels only slightly higher than those at which its odor becomes detectable (5.0 ppm vs .025 ppm), have been found to have accelerated deterioration of neurobehavioral function;37 and
Scientists convened first by the Centers for Disease Control and Prevention (CDC), and more recently by the University of Iowa and Iowa State University, agree CAFO air emissions may constitute a hazard to public health, in addition to workers’ health.3 The latter report recommends that “precautions should be taken to minimize both specific chemical exposures (hydrogen sulfide and ammonia) and mixed exposures (including odor) arising from CAFOs. The Environmental Protection Agency and the Agency for Toxic Substances and Disease Registry (ATSDR) have both recommended that ambient exposure limits be set for ammonia and hydrogen sulfide emissions from CAFOs. These recommendations are based on several experimental and epidemiologic studies of non-CAFO populations documenting respiratory symptoms associated with low level exposure to individual chemical components of CAFO air emissions, particularly including ammonia and hydrogen sulfide. Two published, controlled studies of people residing near CAFOs report eye and respiratory symptoms associated with CAFO air emissions exposures “similar to more prevalent and severe symptoms experienced by CAFO workers who are exposed at much higher concentrations of mixed emissions,”38 although it should be acknowledged these studies cannot be construed as certain “proof” that a specific disease(s) among community residents has arisen from a specific chemical, bacteria or aromatic compound in CAFO emissions.
Noting that moratoria on new CAFO construction have been called for by the Michigan State Medical Society, the Canadian Medical Association as well as local boards of health, moratoria generally citing existing scientific evidence for threats to worker health and public health, combined with insufficient data to determine whether in the face of those risks public health is being adequately protected;39-41 and
Considering APHA’s recently passed policy (#200011) encouraging as a precautionary principle--"that public health decisions must often be made in the absence of scientific certainty, or in the absence of perfect information"--action to prevent potential harm to reproductive health, infants and children, even if some cause and effect relationships have not been established with scientific certainty;42 while noting that children suffer disproportionately from asthma; while fetuses, infants and children are more vulnerable to adverse impacts from bacterial and antimicrobial-resistant infections,43-45 as well as from exposure to neurotoxins,46 all health impacts to which existing science suggests that emissions from CAFOs may contribute; and
Considering the health and economic impacts on CAFO workers, as well as evidence, albeit less certain, indicating impacts on children and CFO neighbors from exposure to large concentrations of manure and their subsequent emissions of dust, toxins, microbes, antibiotics and pollutants into air and water.
Therefore, the American Public Health Association hereby:
Resolves that APHA urge federal, state and local governments and public health agencies to impose a moratorium on new Concentrated Animal Feed Operations until additional scientific data on the attendant risks to public health have been collected and uncertainties resolved.
Resolves that APHA urge federal and state governments to initiate and support research to quantify more precisely the exposures to pollutants in air, water and soil emissions of CAFOs experienced by communities surrounding CAFOs, as well as to investigate the greater vulnerability of infants and children to harm from such pollutants, deriving from either greater exposure or increased toxicity.
1. Gollehon N, Caswell M, Ribaudo M, Kellogg R, Lander C, Letson D (June 2001), Confined Animal Production and Manure Nutrients, Economic Research Service, U.S. Department of Agriculture, Agricultural Information Bulletin No. 771, http://www.ers.usda.gov/publications/aib771/.
2. Horrigan L, Lawrence RS, Walker P (2002), How sustainable agriculture can address the environmental and human health harms of industrial agriculture, Environ Health Perspect 110:445-456.
3. Flora JL, Hodne CJ, Goudy W, Osterberg D, Kliebenstein J, Thu KM, Marquez SP. Social and community impacts. In Iowa State University and the University of Iowa Study Group, Iowa concentrated animal feeding operations air quality study. Iowa City: University of Iowa Press. 2002:147-163.
4. Wilson SM, Howell F, Wing S, Sobsey M. Environmental injustice and the Mississippi hog industry. Env Health Perspect 2002;110(Supp 2):195-201.
5. Wing S, Cole P, Grant G. Environmental injustice in North Carolina’s hog industry, Environ Health Perspect 2000;108(3):225-231.
6. US Department of Agriculture, Agricultural Research Service, Manure and Byproduct Utilization: National Program Annual Report: FY 2001, www.nps.ars.usda.gov/programs/programs.htm?npnumber=206&docid=1076.
7. Sharpley A, et al. “Impacts of animal manure management on ground and surface water quality.” In: JL Hatfield, BA Stewart (eds.) Animal waste utilization: effective use of manure as a soil resource. 1998;173-242.
8. Kirkhorn SR (October 2002), Community and Environmental Health Effects of Concentrated Animal Feeding Operations, Minnesota Medicine, accessed online 11/01/02 at www.MMAonline.net.
9. Gagliardi JV Karns JS. Leaching of Escherichia coli O157:H7 in diverse soils under various agricultural management practices, Appl Environ Microbiol 2000;66(3):877-883.
10. Kirkhorn SR (2002).
11. Health Canada, Federal-Provincial Subcommittee on Drinking Water, Cyanobacterial Toxins – Microcystins in Drinking Water, Document for public comment, April 1998, accessed online at http://www.hc-sc.gc.ca/ehp/ehd/bch/water_quality/consult/microsys.pdf.
12. Centers for Disease Control and Prevention, National Center for Environmental Health, “Harmful algal blooms,” accessed online at http://www.cdc.gov/nceh/hsb/algal.htm.
13. Glasgow HB, Burkholder JM, Schmechel DE, Tester PA, Rublee PA. Insidious effects of a toxic dinoflagellate on fish survival and human health, J Toxicol Environ Health. 1995;46:501–522.
14. Barza M, Gorbach SL, Eds (2002), The need to improve antimicrobial use in agricul-ture: ecological and human health conse-quences, Clin Infect Dis 34 (Suppl 3):S71-144. Available at www.journals.uchicago.edu/CID/journal/con-tents/v34nS3.html. Accessed Aug. 28, 2002.
15. World Health Organization, WHO Global Strategy for Containment of Antimicrobial Resistance, Switzerland, (2001).
16. Chapman HD, Johnson ZB. Use of Antibiotics and Roxarsone in Broiler Chickens in the USA: Analysis for the Years 1995 to 2000, Poultry Science 2002;81:356–364.
17. Momplaisir GM, Rosal CG, Heithmar EM, Arsenic speciation methods for studying the environmental fate of organoarsenic animal-feed additives, USEPA, NERL-Las Vega, 2001, accessed at www.epa.gov/nerlesdl/chemistry/labmonitor/labresearch.htm.
18. Murphy J. The Search for Alternative Feed Additives. Ministry of Agriculture and Food: Ontario, Canada. Accessed June 15, 2003 at www.gov. on.ca/OMAFRA/english/livestock/swine/facts/info_n_alternativefeed.htm.
19. Barza and Gorbach (2002).
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21. Mellon M, Fondriest S. Union of Concerned Scientists. Hogging it: esti-mates of animal abuse in livestock. Nucleus 2001;23:1-3. Also available at www.ucsusa.org, by choosing “antibiotic resistance” and choosing report from the right-hand menu. Accessed Aug. 28, 2002.
22. American Public Health Association Policy #00-LB-5, Addressing the Use of Fluoroquinolone Antibiotics in Agriculture.
23. American Public Health Association Policy #9908, Addressing the Problem of Bacterial Resistance to Antimicrobial Agents and the Need for Surveillance.
24. Chee-Sanford JC, Aminov RI, Krupuc IJ, Garrigues-JeanJean H, Mackie RI. Occurrence and diversity of tetracycline resistance genes in lagoons and ground-water underlying two swine production facilities. Appl Environ Microbiol 2001;67(4):1494-1502.
25. Hamscher G, Pawelzick HT, Sczesny S, et al. Antibiotics in dust originating from a pig fattening farm: a new source of health hazard for farmers? Environ Health Perspect 2003. Accessed 18 June 2003 online at http://ehpnet1.niehs.nih.gov/docs/2003/6288/abstract.html.
26. Simpkins WW, et al. Potential impact of waste storage structures on water resources in Iowa, J. Amer. Water Resources Assoc 2002;38(3):759-71.
27. Huffman RL, Westerman PW. Estimated seepage losses from established swine waste lagoons in the lower coastal plain of North Carolina. Transactions American Society of Agricultural Engineers, 1995;38(2):449-53.
28. Schulte DD. Do earthen structures leak?, Manure matters 1998;4(1), at http://manure.unl.edu/v4n1_98.html.
29. Mallin MA. Impacts of industrial animal production on rivers and estuaries. Amer. Scientist 2000;88:26-37.
30. Wing S, Freedman S, Band L. The potential impact of flooding on confined animal feeding operations in eastern North Carolina. Environ Health Perspect. 2002;110(4):397-91.
31. Simpkins, et al. (2002).
32. SS Schiffman, et al. “Quantification of odors and odorants from swine operations in North Carolina,” Agriculrural and Forest Meteorology 2001;108:213-240.
33. Thorne PS. Air quality issues. In: Iowa concentrated animal feeding operations air quality study, Iowa State University and the University of Iowa Study Group. 2002:35-44. www.public-health.uiowa.edu/ehsrc/CAFOstudy.htm.
34. Merchant JA, Kline J, Donham KJ, Bundy DS, Hodne CJ. Human health effects. In: Iowa State University and the University of Iowa Study Group. Iowa concentrated animal feeding operations air quality study. Iowa City: University of Iowa Press. 2002:121-145.
35. Thu KM, et al. (Eds.) Proceedings, Understanding the impacts of large-scale swine production, June 29-30, 1995, Des Moines, IA. Iowa City, IA: University of Iowa Printing Service. www.public-health.uiowa.edu/icash
36. Donham KJ. The concentration of swine production: Effects on swine health, productivity, human health, and the environment. Veterinary Clin of North Amer: Food Animal Practice 2000;16:559-597.
37. Kilburn KH. Evaluating health effects from exposures to hydrogen sulfide: Central nervous system dysfunction. Environ Epidemiol Toxicol. 1999;1:207-216.
38. Thu K, et al. A control study of the physical and mental health of residents living near a large-scale swine operation, J Agricultural Safety Health 1997;3(1):13-26; and Wing S, Wolf S. Intensive livestock operations, health, and quality of life among eastern North Carolina residents. Environ Health Perspect, 2000;108(3):233-238, as characterized in Merchant JA, et al. (2002).
39. Cerro Gordo (IA) County Board of Health, Animal confinement moratorium ordinance, May 2002.
40. Michigan State Medical Society, Resolution 105-02A, May 2002.
41. Canadian Medical Association, August 2002.
42. Am. J. Public Health. March 2001;91(3):20, online at: http://www.apha. org/legislative/policy/Pols2000_rev.pdf.
43. USDA, Food Safety and Inspection Service, “The Establishment and Implementation of an Active Surveillance System for Bacterial Foodborne Diseases in the United States” (1997). www.fsis.usda.gov/OPHS/fsisrep1.htm.
44. USDA Report to Congress, “FoodNet: An Active Surveillance System for Bacterial Foodborne Diseases in the United States” (1998).
45. Shea K, Florini K, Barlam T, When wonder drugs don’t work: how antibiotic resistance threatens children, seniors and the medically vulnerable, Environmental Defense: Washington, DC, January 2002.
46. Stein J, Schettler T, Wallinga D, Valenti MJ. In harm’s way: toxic threats to child development, Dev Behav Pediatr. 2002;23(1 Suppl):S13-22.
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