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Specific immune response of immunoglobulins M (IgM) and G1 (IgG1) to ovalbumin in beef heifers; (a) heifer calves and pregnant heifers; and (b) heifer calves by feed efficiency groups (efficient, average and inefficient). Differing superscript denotes p < 0.05, according to the Scheffé multiple comparison test and error bars are the 95% confidence interval.
