Abstract
The effect of Clostridium perfringens challenge, number of challenge days, and pre-challenge antibiotic treatment on the induction of necrotic enteritis in broiler chickens raised on litter was studied, and the relationship between bacterial counts and frequency of gut lesions was evaluated. Specific intestinal lesions in randomly selected birds were present despite a lack of disease-specific mortality. Challenge, number of challenge days and frequency of lesions were associated with median counts of C. perfringens. The effect of pre-challenge C. perfringens counts and antibiotics cannot be evaluated unless procedures for the control of pre-challenge infection and methods for the differentiation between wild-type and challenge strains are established.
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