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Proportions of calves with a serum titer ≤ 1:16 or a mean log2 titer ≤ 4 of antibody against BVDV-1 in the same groups of calves. These antibody levels started to be reached earlier and in greater proportions of the calves per time period in the MC group (lighter grey bars) compared with the CR group; the differences between the groups were significant only at 2 and 3 mo of age.
