Abstract
Bacterial flora of hatching eggs and chicks from broiler breeders housed under litter-slat and sloping floor management systems were compared. Gnotobiotic incubation, hatching and rearing methods were utilized. The numbers of bacteria on shells of eggs from breeders in the sloping floor system were significantly less than the numbers of bacteria on the egg shells of breeders in the litter-slat system. Bacterial contamination in day-old chicks was low with no marked difference between systems. When eggs were untreated or dipped in a quarternary ammonium, and chicks chill stressed, more types of enteric bacteria were isolated from chicks of breeders in litter-slat systems. When eggs were sterilized using a mercuric chloride solution, and chicks chill stressed, there were no differences in the number of types of enteric bacteria isolated from chicks of breeders in either the litter-slat or sloping floor systems.
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