Effects of propolis and stocking density on growth performance, nutrient digestibility, and immune system of heat-stressed broilers

Two experiments were conducted to study the effects of propolis (bee glue; BG) supplementation and stocking density on growth performance, ileal nutrient digestibility, gut morphology, and immune response of broilers exposed to heat stress. In Experiment I, a total of 300 1-day-old male chicks (Ross 308) were assigned to six treatments, with five replications of 10 birds each. The birds were fed diet containing no additive (CON) or diet...