Weibull survival curves comparing the pre-breeding probability of remaining seronegative to
in goats. D.IgMp2 = IgM serological status of the source does with (D.IgMp2(−) representing negative does and (D.IgMp2(+) the positive ones. IgGp1 =colostrum derived antibody titres dichotomised at a cut-off of 320 (IgGp1). Goats in cohort 1, farm GS and those born by (D.IgMp2(−) as well as those with IgGp1 =320 had statistically significantly (p < 0.1) higher probabilities of remaining seronegative before breeding than goats from cohort 2, farm LC as well as those from D.IgMp2(+) and those with IgGp1 < 320 colostrum antibodies.