CP and infection: Chicks fed CON and GTX had similar intestinal CP after challenge which was significantly higher (p ≤ 0.05) than their corresponding unchallenged treatments, whereas chicks fed GTY and GTZ diets had similar intestinal CP in challenged chicks and also similar CP (p > 0.05) to their corresponding unchallenged chicks, which shows a prevention in establishing infection in these treatments (Table 6).