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adult albino antibiotics average Bartonella infection body weight breeders breeding cancer casein College of Physicians Columbia University commercial dd bb aa deficient diet diet P4 effect efficiency of food endemic pneumonia experimental factors feeding females fertility Figure Fj hybrids food utilization gene pairs geneticist genotype grams growth curve Heston heterozygous homozygous inbred line inbred strains inbreeding indicates infection Institutes of Health Kaunitz laboratory animals lactation litter log reciprocal Long-Evans lung male rats metabolism mice middle ear mouse mutants National Institutes Nelson normal nutritional offspring otitis otitis media pellet diets pen-breeding period Physicians and Surgeons Physiol plotted pneumonia postweaning produced protein purified diet pyridoxine rancid rancid lard rat colony realimentation resistance respiratory disease riboflavin selection semi-purified diet shows Slanetz slope Sprague-Dawley stock diet studies supplemented Symposium tion tocopherol various vitamin vitamin B12 weaning weight weeks York young Zucker