Kinetics of the anti-BLVgp51 antibody titre in experimental calves. Calves were experimentally inoculated with blood from an adult cow with PL. The antibody titre was determined by testing plasma samples by ELISA 108 in 18 calves carrying different BoLA DRB3 alleles. N = 6 calves with BoLA DRB3*1501, n = 7 calves with BoLA DRB3*902 and n = 5 calves with neutral alleles. The antibody titre was log transformed (mean ± standard error).