The Inheritance of Resistance to Bacillary White Diarrhea

Inheritance as a Factor in Poultry Disease

“…In poultry, Roberts and Card (1926) have demonstrated the effectiveness of selective breeding upon resistance to pullorum disease, and has shown similar results for fowl typhoid. That heritable differences in resistance to such diseases exist has long been known, but until the last ten years most of this evidence was statistical in nature, or was confined to the demonstration of species and racial differences.…”

“…That heritable differences in resistance to such diseases exist has long been known, but until the last ten years most of this evidence was statistical in nature, or was confined to the demonstration of species and racial differences. Furthermore, both Roberts and Card (1926) and have shown that strain differences in resistance to both these diseases exist in unselected flocks. In poultry, Roberts and Card (1926) have demonstrated the effectiveness of selective breeding upon resistance to pullorum disease, and has shown similar results for fowl typhoid.…”

Paratyphoid infection induced byEimeria tenellain the broiler‐type chickens

“…In the preliminary examinations where layer-type chickens were used, the number of S. typhimurium in the coccidiuminfected caeca was greater than that in the caeca infected with S. typhimurium alone, but no lesions were observed in the liver. Significant difference in susceptibilities among breeds of chickens was reported (Roberts and Card, 1926). The lighter breeds, particularly Leghorn, were less susceptible to S. pullorum than heavy breeds.…”

Genetic Predisposition toBacillus piliformisInfection among Mice

“…This relationship of dominance is almost universally found to be true of the host inheritance mechanism for warding off a disease. Rich (1923) has shown that it holds for the resistance of two strains of guinea-pigs to both B. suisepticus and B. cholera suis, Irwin (1929) for resistance of the rat to inoculation of Danysz bacillus, Lambert (1932) for the domestic fowl to Salmonella gallinarum, Frateur (1924) for the domestic fowl to the diphtheria bacillus, Roberts and Card (1926) for the domestic fowl to S. pullorum, 25-2 Manresa (1927) for the rabbit to inoculated B. abortus, Schott (1932) for the mouse to inoculated S. aertrycke, and Webster (in a paper in press which he kindly allows us to quote) for the mouse to stomach tube inoculation of B. enteritidis. This relation of dominance in resistance to pathogenic organisms is furthermore as wellnigh universal in plants as it is in animals.…”