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albino ascorbic acid bottle breeders breeding colonies Breeding Unit brilliant green brilliant green agar cages carriers cent coccidia coccidiosis colonies of mice commercial mouse colony condition containing control of Salmonella daily domestic rabbits embryos enteritidis exposed fecal cultures fecal matter feces females floor food receptacles gestation growth response Guinea Pig Breeding GUINEA PIG DIET hamsters horns hutch inch incidence indicate insure intake laboratory litter liver LONG-EVANS males mating metal method mice mice and rats micrograms milligrams nutritional observed oocysts palpating paratyphoid paratyphoid infection pellet period permit practice protein quarters Rabbit Breeding rat colonies resistance respiratory infection Rockland Farms ROCKLAND GUINEA PIG ROCKLAND RABBIT RATION ROCKLAND RAT DIET root foods routine Salmonella enteritidis Salmonella infection sample scurvy Slanetz small animals sporulation sterile stock diet strain streptococci streptomycin temperature tests tube urine uterus vermin vitamin weeks of age weight young adult