Fig. 3From: Assessment of trade-offs between feed efficiency, growth-related traits, and immune activity in experimental lines of layer chickensHumoral antibody titers of R+ and R− chickens, measured by ELISA or IHA (NDV) after vaccination, at 8 and 12 weeks of age. Asterisks indicate significant differences between lines (*p < 0.05; ***p < 0.001), NS = not significantBack to article page