[Experimental infections of broiler chickens by linked and not-linked Campylobacter jejuni with Escherichia coli]

analyse microbiologique bacteriose bacterioses bacteriosis batteriosi broiler chickens campylobacter disease transmission escherichia gain de poids ganancia de peso in vivo experimentation incremento di peso microbiological analysis polli da carne pollo de engorde poulet de chair servicios veterinarios servizi veterinari sintomi sperimentazione in vivo symptome symptoms transmission des maladies trasmissione delle malattie veterinary services weight gain