Abstract
Summary An experiment was conducted to study the effect of dietary fat source on immune responses of broiler chickens reared according to commercial practices. Immune measurements included weight and percentage of total body mass of the spleen, thymus and bursa of Fabricius, and responses to Sheep Red Blood Cell (SRBC) injection and vaccine titers for Newcastle Disease Virus (NDV), Infectious Bursal Disease Virus (IBDV) and Infectious Bronchitis Virus (IBV). In a completely randomised design, a total of 200 Ross 308 broiler chickens were assigned to four replicates (10 chicks) for each of five dietary treatments: 4% beef tallow; 4% canola oil; 4% sunflower oil, 2% beef tallow and 2% canola oil; and 2% beef tallow and 2% sunflower oil.
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