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Antibody response to the vaccination among calves with different maternal antibody levels (MAL) Antibody titres against M. haemolytica (Mh) and P. multocida (Pm) in (1) the first experiment and in (2) the second experiment for the high, low, and control groups. A, B P < 0.01; a, b P < 0.05; # P = 0.18; arrows – time of vaccination
