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Incidence, sources, and control of food-borne Salmonella spp. in poultry feeds

Published online by Cambridge University Press:  18 September 2007

K.G. Maciorowski ,
F.T. Jones ,
S.D. Pillai  and
S.C. Ricke
K.G. Maciorowski
Affiliation:
Poultry Science Department, Texas A&M University, College Station, TX 77843-2472
F.T. Jones
Affiliation:
Center of Excellence for Poultry Science, University of Arkansas, Fayetteville, AR 72701, USA
S.D. Pillai
Affiliation:
Poultry Science Department, Texas A&M University, College Station, TX 77843-2472
S.C. Ricke*
Affiliation:
Poultry Science Department, Texas A&M University, College Station, TX 77843-2472
*
*Corresponding author: e-mail: sricke@poultry.tamu.edu
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Abstract

Transmission of food-poisoning salmonellae in the poultry industry is often associated with a contaminated feed supply. Occurrence of food-borne Salmonella spp. continues to be documented on poultry feeds and feed ingredients. This is in part due to the wide variety of environmental origins for Salmonella spp. and its ability to easily cross-contaminate during feed processing and storage. Since Salmonella spp. have been shown to survive for several months under feed storage conditions, they can remain a persistent problem for poultry production. Limiting Salmonella spp. contamination of poultry feeds requires application of surveillance approaches during feed manufacturing and distribution along with the introduction of effective intervention and hurdle technologies. Representative sampling approaches may be needed to achieve consistent contamination reduction.

Keywords

food-borne Salmonellaincidencepoultry feedscontrol
Type
Reviews
Information
World's Poultry Science Journal , Volume 60 , Issue 4 , December 2004 , pp. 446 - 457
Copyright
Copyright © Cambridge University Press 2004

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References

Abdel-Monem, M.H.A.A. and Dowidar, A. (1990) Recoveries of Salmonella from soil in eastern region of Saudi Arabia Kingdom. Journal of Egyptian Public Health Association 65: 61–75.Google ScholarPubMed
Adesiyun, A.A., Seepersadsingh, N., Inder, L. and Caesar, K. (1998) Some bacterial enteropathogens in wildlife and racing pigeons from Trinidad. Journal of Wildlife Diseases 34: 73–80.CrossRefGoogle ScholarPubMed
Allred, J.N., Walker, J.W., Beal, V.C. Jr., and Germaine, F.W. (1967) Asurvey to determine the Salmonella contamination rate in livestock and poultry feeds. Journal of Applied Veterinary Medicine Association 151: 1857–1860.Google Scholar
Andrews, W.H., June, G.A., Sherrod, P.S., Hammack, T.S. and Amaguana, R.M. (1995) Salmonella. Pages 5.01–5.20 in: Bacteriological Analytical Manual. 8th ed. AOAC International, Gaithersburg, MD.Google Scholar
Angulo, F.J. and Swerdlow, D.L. (1998) Salmonella enteritidis infections in the United States. Journal of Applied Veterinary Medicine Association 213: 1729–1731.Google ScholarPubMed
Anonymous (1999) Salmonella feed contamination. International Hatchery Practice 13: 37–38.Google Scholar
Beaux, M.F. (1988) Sampling of grains and seeds methods, and means. In: Preservation and Storage of Grains, Seeds and Their By-Products. Multon, J.L. , ed. Lavoisier, Paris, France, pages 446–453.Google Scholar
Beckers, H.J., Van Leusden, F.M., Meijssen, M.J.M. and Kampelmacher, E.H. (1985) Reference material for the evaluation of a standard method for the detection of Salmonellas in foods and feeding stuffs. Journal of Applied Bacteriology 59: 507–512.CrossRefGoogle ScholarPubMed
Beckers, H.J., Roberts, D., Pietzsch, O., Van Schothorst, M., Vassiliadis, P. and Kampelmacher, E.H. (1987) Reference samples for checking the performance of Salmonella isolation methods. International Journal of Food Microbiology 4: 51–57.CrossRefGoogle Scholar
Best, P. (1994) The clean feed challenge. Feed Management 45: 27–28.Google Scholar
Buchanan, R.L. and Whiting, R.C. (1998) Risk assessment: a means for linking HACCP plans and public health. Journal of Food Protection 61: 1531–1534.CrossRefGoogle ScholarPubMed
Byun, M.-W., Kwon, J.-H., Cha, B.-S., Cho, H.-O. and Kim, Y.-B. (1988) Effects of gamma irradiation on the decontamination of animal feeds: sterilization of protein sources. Korean Journal of Food Science and Technology 20: 112–118.Google Scholar
Carlson, V.L. and Snoeyenbos, G.H. (1970) Effect of moisture on Salmonella populations in animal feeds. Poultry Science 49: 717–725.CrossRefGoogle ScholarPubMed
Christensen, C.M., Miller, B.S. and Johnston, J.A. (1992) Moisture and its measurement. In: Storage of Cereal Grains and Their Products. 4th edition. Sauered, D.B., ed American Association of Cereal Chemists, St. Paul, MN, pages 39–54.Google Scholar
Cox, N.A., Burdick, D., Bailey, J.S. and Thomson, J.E. (1986) Effect of the steam conditioning and pelleting process on the microbiology and quality of commercial-type poultry feeds. Poultry Science 65: 704–709.CrossRefGoogle Scholar
Craven, P.C., Mackel, D.C., Baine, W.B., Barker, W.H., Gangarosa, E.J., Goldfield, M., Rosenfeld, H., Altman, R., Lachapelle, G., Davies, J.W. and Swanson, R.C. (1975) International outbreak of Salmonella eastbourne infection traced to contaminated chocolate. Lancet I(7910): 788–793.CrossRefGoogle Scholar
Cullison, A.E. and Lowrey, R.S. (1987) Feeds and Feeding. 4th edition. Prentice-Hall, Inc., Englewood Cliffs, NJ.Google Scholar
Davies, R.H. and Wray, C. (1996) Seasonal variations in the isolation of Salmonella typhimurium, Salmonella enteritidis, Bacillus cereus and Clostridium perfringens from environmental samples. Journal of Veterinary Medicine B43: 119–127.CrossRefGoogle Scholar
Davies, R.H. and Wray, C. (1997) Distribution of Salmonella contamination in ten animal feedmills. Veterinary Microbiology 51: 159–169.CrossRefGoogle Scholar
De Graft-Hanson, J. (2003) Hazard analysis critical control point system and its impact on the meat and poultry industry. Avian and Poultry Biology Reviews 14: 79–97.CrossRefGoogle Scholar
Devi, S.J. and Murray, C.J. (1991) Cockroaches (Blatta and Periplaneta species) as reservoirs of drugresistant Salmonellas. Epidemiology and Infection 107: 357–361.CrossRefGoogle ScholarPubMed
Everard, C.O.R., Tota, B., Bassett, D. and Cameille, A. (1979) Salmonella in wildlife from Trinidad and Grenadaw, W. I. Journal of Wildlife Diseases 15: 213–219.CrossRefGoogle ScholarPubMed
Farrell, B.L., Ronner, A.B. and Wong, A.C.L. (1998) Attachment of Escherichia coli O157:H7 in ground beef to meat grinders and survival after sanitation with chlorine and peroxyacetic acid. Journal of Food Protection 61: 817–822.CrossRefGoogle ScholarPubMed
Fay, J.P. and Farias, R.N. (1975) The inhibitory action of fatty acids on the growth of Escherichia coli. Journal of General Microbiology 91: 233–240.CrossRefGoogle ScholarPubMed
Foster, J.W. (1995) Low pH adaptation and the acid tolerance response of Salmonella typhimurium. Critical Reviews in Microbiology 21: 215–237.CrossRefGoogle Scholar
Furuta, K., Morimoto, S. and Sato, S. (1980a) Bacterial contamination in feed ingredients, formulated chicken feed and reduction of viable bacteria by pelleting. Laboratory Animals 14: 221–224.CrossRefGoogle ScholarPubMed
Furuta, K., Oku, I. and Morimoto, S. (1980b) Effect of steam temperature in the pelleting process of chicken food on the viability of contaminating bacteria. Laboratory Animals 14: 293–296.CrossRefGoogle ScholarPubMed
Gast, R.K., Stephens, J.F. and Foster, D.N. (1988) Effects of kanamycin administration to poultry on the interspecies transmission of drug-resistant Salmonella. Poultry Science 67: 699–706.CrossRefGoogle ScholarPubMed
Grimont, P.A.D., Grimont, F. and Bouvet, P. (2000) Taxonomy of the genus Salmonella. In: Salmonella in Domestic Animals. Wray, C. and Wrayed, A.CAB International, Wallingford, UK, pages 1–17.Google Scholar
Ha, S.D., Jones, F.T., Kwon, Y.M. and Ricke, S.C. (1997) Survival of an unirradiated Salmonella typhimurium marker strain inoculated in poultry feeds after irradiation. Journal of Rapid Methods and Automation in Microbiology 5: 47–59.CrossRefGoogle Scholar
Ha, S.D., Maciorowski, K.G., Kwon, Y.M., Jones, F.T. and Ricke, S.C. (1998) Indigenous feed microflora and Salmonella typhimurium marker strain survival in poultry feed mash diets containing varying levels of protein. Animal Feed Science and Technology 76: 23–33.Google Scholar
Ha, S.D., Maciorowski, K.G. and Ricke, S.C. (2000) Application of antimicrobial approaches for reducing Salmonella contamination in poultry feed: a review. Research Advances in Antimicrobial Agents & Chemotherapy 1: 19–33.Google Scholar
Hacking, W.C., Mitchell, W.RD. and Carlson, H.C. (1978) Salmonella investigation in an Ontario feed mill. Canadian Journal of Comparative Medicine 42: 400–406.Google Scholar
Hahn, H. (1999) Animal meal: production and determination in feedstuffs and the origin of bovine spongiform encephalopathy. Naturwissenschaften 86: 62–70.CrossRefGoogle ScholarPubMed
Halls, N.A. and Tallentire, A. (1978) Effects of processing and gamma irradiation on the microbiological contaminants of a laboratory animal diet. Laboratory Animals 12: 5–10.Google Scholar
Hamilton, P.B. (1975) Proof of mycotoxicoses being a field problem and a simple method for their control. Poultry Science 54: 1706–1708.CrossRefGoogle Scholar
Hanis, T., Mnukova, J., Jelen, P., Klir, P., Perez, B. and Pesek, M. (1988) Effect of gamma irradiation on survival of natural microflora and some nutrients in cereal meals. Cereal Chemistry 65: 381–383.Google Scholar
Harris, I.T., Fedorka-Cray, P.J., Gray, J.T., Thomas, L.A. and Ferris, K. (1997) Prevalence of Salmonella organisms in swine feed. Journal of Applied Veterinary Medicine Association 210: 382–385.CrossRefGoogle ScholarPubMed
Henzler, D.J. and Opitz, H.M. (1992) The role of mice in the epizootiology of Salmonella enteritidis infection on chicken layer farms. Avian Diseases 36: 625–631.Google Scholar
Hess, J. (1994) Feed system sanitation said worth the effort. Poultry Digest 53: 46–47.Google Scholar
Himathongkham, S., Das Graça, S.Pereira, M. and Riemann, H. (1996) Heat destruction of Salmonella in poultry feed: effect of time, temperature, and moisture. Avian Diseases 40: 72–77.CrossRefGoogle ScholarPubMed
Hobson, P.N., Bousfield, S., Summers, R. and Mills, P.J. (1979) Anaerobic digestion of piggery and poultry wastes. In: Anaerobic Digestion. Stafford, D.A.Weatherly, B.I., and Hugheseds, D.E., eds. Applied Science Publishers, Ltd., Essex, UK, pages 237–253.Google Scholar
Hoffmans, C.M. and Fung, D.Y.C. (1993) Effective method for dry inoculation of bacterial cultures. Journal of Rapid Methods and Automation in Microbiology 1: 287–294.CrossRefGoogle Scholar
Hollinger, K. (2000) Epidemiology and salmonellosis. In: Salmonella in Domestic Animals. Wray, C. and Wray, A., eds. CAB International, Wallingford, UK, pages 341–354.Google Scholar
Humphrey, T. (2000) Public-health aspects of Salmonella infection. In: Salmonella in Domestic Animals. Wray, C. and Wray, A., eds. CAB International, Wallingford, UK, pages 245–264.CrossRefGoogle Scholar
Hussong, D., Burge, W.D. and Enkiri, N.K. (1985) Occurrence, growth, and suppression of salmonellae in composted sewage sludge. Applied and Environmental Microbiology 50: 887–893.CrossRefGoogle ScholarPubMed
Inami, G.B. and Moler, S.E. (1999) Detection and isolation of Salmonella from naturally contaminated alfalfa seeds following an outbreak investigation. Journal of Food Protection 62: 662–664.CrossRefGoogle ScholarPubMed
In't Veld, P.H. and Notermans, S. (1992) Use of reference materials (spray-dried milk artificially contaminated with Salmonella typhimurium) to validate detection methods for Salmonella. Journal of Food Protection 55: 855–858.CrossRefGoogle ScholarPubMed
Izadjoo, M.J., Pantoja, C.O.A. and Siebeling, R.J. (1987) Acquisition of Salmonella flora by turtle hatchlings on commercial turtle farms. Canadian Journal of Microbiology 33: 718–724.CrossRefGoogle ScholarPubMed
Izat, A.L., Tidwell, N.M., Thomas, R.A., Reiber, M.A., Adams, M.H., Colberg, M. and Waldroup, P.W. (1990) Effect of a buffered propionic acid in diets on the performance of broiler chickens and on microflora of the intestine and carcass. Poultry Science 69: 818–826.CrossRefGoogle ScholarPubMed
Izat, A.L., Kopek, J.M. and Mcginnis, J.D. (1991) Research note: incidence, number, and serotypes of Salmonella on frozen broiler chickens at retail. Poultry Science 70: 1438–1440.CrossRefGoogle ScholarPubMed
Jaquette, C.B., Beuchat, L.R. and Mahon, B.E. (1996) Efficacy of chlorine and heat treatment in killing Salmonella stanley inoculated onto alfalfa seeds and growth and survival of the pathogen during sprouting and storage. Applied and Environmental Microbiology 62: 2212–2215.CrossRefGoogle ScholarPubMed
Jones, F.T., Axtell, R.C., Rives, D.V., Scheideler, S.E., Tarver, F.R. Jr., Walker, R.L. and Wineland, M.J. (1991) A survey of Salmonella contamination in modern broiler production. Journal of Food Protection 54: 502–507.CrossRefGoogle ScholarPubMed
Jones, F. T. and Ricke, S.C. (1994) Researchers propose tentative HACCP plan for feed mills. Feedstuffs 66: 32, 36–37.Google Scholar
Jones, P.W., Collins, P., Brown, G.T.H. and Aitken, M. (1982) Transmission of Salmonella mbandaka to cattle from contaminated feed. Journal of Hygiene 88: 255–263.CrossRefGoogle ScholarPubMed
Juven, B.J., Cox, N.A., Bailey, J.S., Thomson, J.E., Charles, O.W. and Shutze, J.V. (1984) Survival of Salmonella in dry food and feed. Journal of Food Protection 47: 445–448.CrossRefGoogle ScholarPubMed
Kapperud, G. and Rosef, O. (1983) Avian wildlife reservoir of Campylobacter fetus subsp. jejuni, Yersina spp., and Salmonella spp. in Norway. Applied and Environmental Microbiology 45: 375–380.CrossRefGoogle Scholar
Kapperud, G., Stenwig, H. and Lassen, J. (1998) Epidemiology of Salmonella typhimurium O:4–12 infection in Norway. American Journal of Epidemiology 147: 774–782.CrossRefGoogle ScholarPubMed
Khalil, K., Lindblom, G.B., Mazhar, K. and Kaijser, B. (1994) Flies and water as reservoirs for bacterial enteropathogens in urban and rural areas in and around Lahore, Pakistan. Epidemiology & Infection 113: 435–444.CrossRefGoogle Scholar
Khan, M. and Katamy, M. (1969) Antagonistic effect of fatty acids against Salmonella in meat and bone meal. Applied Microbiology 17: 402–404.CrossRefGoogle ScholarPubMed
Klowden, M.J. and Greenberg, B. (1976) Salmonella in the American cockroach: evaluation of vector potential through dosed feeding experiments. Journal of Hygiene 77: 105–111.CrossRefGoogle ScholarPubMed
Klowden, M.J. and Greenberg, B. (1977) Effects of antibiotics on the survival of Salmonella in the American cockroach. Journal of Hygiene 79: 339–345.CrossRefGoogle ScholarPubMed
Køhler, B. (1993) Beispiele für die anreicherung von Salmonellen in der umwelt [Demonstration ofdissemination and enrichment of Salmonella in the environment]. Deutsche Tierärztlche Wochenschrift 100: 264–274.Google Scholar
Kopanic, R.J. Jr., Sheldon, B.W. and Wright, C.G. (1994) Cockroaches as vectors of Salmonella: laboratory and field trials. Journal of Food Protection 57: 125–132.CrossRefGoogle ScholarPubMed
Kwon, Y.M., Woodward, C.L.Pillai, S.D., Peñ, AJ., Corrier, D.E., Byrd, J.A. and Ricke, S.C. (2000) Litter and aerosol sampling of chicken houses for rapid detection of Salmonella typhimurium contamination using gene amplification. Journal of Industrial Microbiology and Biotechnology 24: 379–382.CrossRefGoogle Scholar
Leeson, S. and Marcotte, M. (1993) Irradiation of poultry feed. I. Microbial status and bird response. World's Poultry Science Journal 49: 19–33.Google Scholar
Letellier, A., Messier, S., Paré, J., Ménard, J. and Quessy, S. (1999) Distribution of Salmonella in swine herds in Quebec. Veterinary Microbiology 67: 299–306.CrossRefGoogle ScholarPubMed
Limawongpranee, S., Hayashidani, H., Okatani, A.T., Hirota, C., Kaneko, K.-I. and Ogawa, M. (1999) Contamination of Salmonella blockley in the environment of a poultry farm. Avian Diseases 43: 302–309.CrossRefGoogle ScholarPubMed
Liu, T.S., Snoeyenbos, G.H. and Carlson, V.L. (1969) Thermal resistance of Salmonella senftenberg 775W in dry animal feeds. Avian Diseases 13: 611–631.CrossRefGoogle ScholarPubMed
Loper, R. (1999) AAM identifies key microbiology-related food safety issues. ASM News 65: 747–751.Google Scholar
Marx, M.B. (1969) Two surveys of Salmonella infection among certain species of wildlife in northern Virginia (1963 and 1965–1966). American Journal of Veterinary Research 30: 2003–2006.Google ScholarPubMed
Matlho, G., Himathongkham, S., Riemann, H. and Kass, P. (1997) Destruction of Salmonella enteritidis in poultry feed by combination of heat and propionic acid. Avian Diseases 41: 58–61.CrossRefGoogle ScholarPubMed
Mccapes, R.H., Ekperigin, H.E., Cameron, W.J., RITCHIE, W.L., SLAGTER, J., STANGELAND, V. and NAGARAJA, K.V. (1989) Effect of a new pelleting process on the level of contamination of poultry mash by Escherichia coli and Salmonella. Avian Diseases 33: 103–111.CrossRefGoogle Scholar
Mead, P.S., Slutsker, L., Dietz, V., Mccaig, L.F., Bresee, J.S., Shapiro, C., Griffin, P.M. and Tauxe, R.V. (1999) Food-related illness and death in the United States. Emerging Infectious Diseases 5: 607–625.CrossRefGoogle ScholarPubMed
Mitchell, M.A. and Shane, S.M. (2000) Preliminary findings of Salmonella spp. in captive green iguanas (Iguana iguana) and their environment. Preventative Veterinary Medicine 45: 297–304.CrossRefGoogle ScholarPubMed
Morales, R.A. (1998) Microbial risk assessment, economics, and food safety. Journal of Applied Veterinary Medicine Association 213: 1746–1749.Google Scholar
Mossel, D.A.A., Van Schothorst, M. and Kampelmacher, E.H. (1967) Comparative study on decontamination of mixed feeds by radicidation and by pelletisation. Journal of the Science of Food and Agriculture 18: 362–367.CrossRefGoogle ScholarPubMed
Murray, C.J. (1991) Salmonellae in the environment. Review Science and Technical Office of International Epizootics 10: 765–785.CrossRefGoogle ScholarPubMed
Murray, C.J. (2000) Environmental aspects of Salmonella. In: Salmonella in Domestic Animals. Wray, C., and Wray, A., eds. CAB International, Wallingford, UK, pages 265–284.CrossRefGoogle Scholar
Nabbut, N.H. (1978) Salmonella serotypes encountered in animal feed additives in Lebanon. American Journal of Veterinary Research 39: 893–895.Google Scholar
Nathanson, N., Wilesmith, J. and Griot, C. (1997) Bovine spongiform encephalopathy (BSE): causes and consequences of a common source epidemic. American Journal of Epidemiology 145: 959–969.CrossRefGoogle ScholarPubMed
Nichols, A.A. and Leaver, C.W. (1966) Methods of examining damp grain at harvest and after sealed and open storage: changes in the microflora of damp grain during sealed storage. Journal of Applied Bacteriology 29: 566–581.CrossRefGoogle ScholarPubMed
Nielsen, B.B. and Clausen, B. (1975) The incidence of Salmonella bacteria in Danish wildlife and in imported animals. Nordisk Veterinarmedecin 27: 633–640.Google ScholarPubMed
Obi, S.K.C. (1978) The effects of pelleting and gamma irradiation on the microbial population of animal diets. Zentralblatt für Veterinarmedizin Reihe B25: 178–185.Google Scholar
Pritzl, M.C. and Kienholz, E.W. (1973) The effect of hydrochloric, sulfuric, phosphoric, and nitric acids in diets for broiler chicks. Poultry Science 52: 1979–1981.CrossRefGoogle ScholarPubMed
Rasmussen, O.G., Hansen, R., Jacobs, N.J. and Wilder, O.H.M. (1964) Dry heat resistance of Salmonellae in rendered animal by-products. Poultry Science 43: 1151–1157.CrossRefGoogle Scholar
Roberts, T. (1988) Salmonellosis control: estimated economic costs. Poultry Science 67: 936–943.CrossRefGoogle ScholarPubMed
Romans, J.R., Costello, W.J., Carlson, C.W., Greaser, M.L. and Jones, K.W. (2001) The Meat We Eat. 14th ed. Interstate Publishers, Danville, IL.Google Scholar
Rosef, O. and Kapperud, G. (1983) House flies (Musca domestica) as possible vectors of Campylobacter fetus subsp. jejuni. Applied and Environmental Microbiology 45: 381–383.Google Scholar
Schnurrenberger, P.R., Held, L.J., Martin, R.J., Quist, K.D. and Galton, M.M. (1968) Prevalence of Salmonella spp. in domestic animals and wildlife on selected Illinois farms. Journal of Applied Veterinary Medicine Association 153: 442–445.Google ScholarPubMed
Schutze, G.E., Sikes, J.D., Stefanova, R. and Cave, M.D. (1999) The home environment and salmonellosis in children. Pediatrics 103: E1–E5.CrossRefGoogle ScholarPubMed
Singer, J.T., Opitz, H.M., Gershman, M., Hall, M.M., Muniz, I.G. and Rao, S.V. (1992) Molecular characterization of Salmonella enteritidis isolates from Maine poultry and poultry farm environments. Avian Diseases 36: 324–333.CrossRefGoogle ScholarPubMed
Stenstrøm, T.A. (1989) Bacterial hydrophobicity, an overall parameter for the measurement of adhesion potential to soil particles. Applied and Environmental Microbiology 55: 142–147.CrossRefGoogle ScholarPubMed
Stott, J.A., Hodgson, J.E. and Chaney, J.C. (1975) Incidence of salmonellae in animal feed and the effect of pelleting on content of enterobacteriaceae. Journal of Applied Bacteriology 39: 41–46.Google Scholar
Thigpen, J.E., Moore, J.A., Gupta, B.N. and Feldman, D.B. (1975) Opossums as a reservoir for salmonellae. Journal of Applied Veterinary Medicine Association 167: 590–597.Google ScholarPubMed
Thomason, B.M., Biddle, J.W. and Cherry, W.B. (1975) Detection of salmonellae in the environment. Applied Microbiology 30: 764–767.CrossRefGoogle ScholarPubMed
Todd, E.C.D. (1989) Preliminary estimates of costs of food-borne disease in the United States. Journal of Food Protection 52: 595–601.CrossRefGoogle ScholarPubMed
Turpin, P.E., Maycroft, K.A., Rowlands, C.L. and Wellington, E.M.H. (1993) Viable but non-culturable salmonellas in soil. Journal of Applied Bacteriology 74: 421–427.CrossRefGoogle ScholarPubMed
Urlings, H.A.P., Fransen, N.G., Bijker, P.G.H. and Van Logtestijn, J.G. (1993) Proteolysis and amino acid breakdown of heated and irradiated poultry byproducts and muscle tissue. Journal of Animal Science 71: 2432–2438.Google Scholar
Vanderwal, P. (1979) Salmonella control of feedstuffs by pelleting or acid treatment. World's Poultry Science Journal 30: 70–78.CrossRefGoogle Scholar
Veldman, A., Vahl, H.A., Borggreve, G.J. and Fuller, D.C. (1995) A survey of the incidence of Salmonella species and enterobacteriaceae in poultry feeds and feed components. Veterinary Record 136: 169–172.CrossRefGoogle ScholarPubMed
Williams, J.E. (1981a) Salmonellas in poultry feeds B a worldwide review. Part I: Introduction. World's Poultry Science Journal 37: 6–19.Google Scholar
Williams, J.E. (1981b) Salmonellas in poultry feeds – a worldwide review. Part III. Methods in control and elimination. World's Poultry Science Journal 37: 97–105.CrossRefGoogle Scholar
Williams, J.E. and Benson, S.T. (1978) Survival of Salmonella typhimurium in poultry feed and litter at three temperatures. Avian Diseases 22: 742–747.CrossRefGoogle ScholarPubMed