Characteristics of Salmonella spp. and Escherichia coli isolated from broiler flocks classified as "good" or "poor" producers.
Cecal samples from 100 broiler flocks were cultured for Escherichia coli and Salmonella. Samples were selected from flocks classified as either "good" or "poor" producers by a production formula. In an attempt to identify predictors of flock productivity, isolates were studied for differences in antibiotic resistances, hemagglutination of erythrocytes, production of colicins, production of siderophores, type of hemolysis, resistance to host complement, and presence of plasmids. S. typhimurium (copenhagen) was isolated from one poor producing flock and three good producers. Salmonella isolates showed no significant differences in the parameters studied. The E. coli isolates showed significant differences only for the presence of plasmids. These data indicate that differences in host intestinal E. coli from good and poor producing flocks do not predict flock productivity.
Spears
K R
KR
Department of Medical Microbiology, College of Veterinary Medicine, University of Georgia, Athens 30602.
Wooley
R E
RE
Brown
J
J
Fletcher
O J
OJ
Payeur
J B
JB
D000818:Animals; D002432:Cecum / Q000382:microbiology; D002645:Chickens / Q000382:microbiology* / Q000502:physiology; D003087:Colicins / Q000096:biosynthesis; D003165:Complement System Proteins / Q000276:immunology; D004352:Drug Resistance, Microbial; D004926:Escherichia coli / Q000187:drug effects / Q000235:genetics / Q000302:isolation & purification* / Q000502:physiology; D006384:Hemagglutination; D006461:Hemolysis; D007502:Iron Chelating Agents / Q000378:metabolism; D010957:Plasmids; D012475:Salmonella / Q000187:drug effects / Q000235:genetics / Q000302:isolation & purification* / Q000502:physiology; D017262:Siderophores
D003087:Colicins; D007502:Iron Chelating Agents; D017262:Siderophores; D003165:Complement System Proteins