Abstract
INTRODUCTIONTHE capacity of an individual to resist infection by various microorganisms depends upon one or more lines of defense. When these measures for natural resistance to a specific pathogen differ between breeds or varieties of an animal species little is known of the factors involved. The breed and age of the chicken have been reported to be involved in the resistance (or lack of resistance) of chickens to Salmonella gallinarum (Lambert and Knox, 1928; and Prince and Garren, 1966). Saline extracts of various tissues, blood and sera of young chickens differ in the in vitro inhibition of S. pullorum and S. gallinarum organisms (Schnetzler and Hartsell, 1940; Prince and Garren, 1966; Prince, 1967). These studies compare the capacity of extracts from the intestine and pancreas of chickens experimentally infected with S. gallinarum (fowl typhoid) to inhibit the fowl typhoid organism in vitro.MATERIALS AND METHODSThe chickens used in…
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