Effects of nutritionally balanced and stabilized flaxmeal-based diets on Eimeria tenella infections in chickens

Twenty Sex Sal cockerels were randomly assigned to each of eight groups; ea ch of four nutritionally balanced diets were fed to two groups from 1 d thr ough 4 wk of age. These diets contained 0, 2, 5, or 10% stabilized flaxseed meal that provided a calculated 0, 0.45, 1.11, or 2.22% n-3 fatty acids, p rimarily linolenic acid. At 3 wk of age, one group of chickens from each di et treatment was infected with Eimeria tenella and was housed in separate b ut similar conditions to uninfected control chickens. At 6 d postinfection, chickens were weighed, bled, killed, and scored for lesions. No level of d ietary flaxmeal tested provided protection against weight gain depression, increased feed conversion ratios, or lesions. We concluded that these diets did not protect against E. tenella infection because levels of linolenic a cid were not high enough, and the oxidative potentials were well suppressed by vitamin E and other stabilizers present.