A comparison of immune response and organ weights in broiler chickens




Rothschild, Daniel

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University of Guelph


The objective was to benchmark data on immune response and organ weights of three slower growing strains and one fast growing strain of broiler chickens raised under the same conditions. Relative weights of cardiovascular, respiratory, hepatic, renal and lymphatic organs were compared across strains, as were antibody response to infectious bronchitis virus (IBV) vaccine and oocysts from Eimeria spp. A significant effect was seen on organ size when compared at the heavier of two target weights and at the same age. Conventional strain (C) had significantly smaller relative kidney and lung sizes, while slower strain H had significantly smaller relative hearts compared to all other strains. Significant effects for antibody concentration in response to vaccination for IBV, in which strain C had higher antibody titers compared to two slower strains M and H. The results from this study indicate that growth differences between strains impact organ weights and immune status.



Broilers, Slow, Organ, Immune, Welfare