Table 1.

Effect of the health of the udder (healthy or mastitic) on ROS (CarrU), SAC (μmol HClO/ml) and OSi (ROS/SAC) in the blood of dairy cows at dry-off, calving and 30d post-partum. Group A – healthy animals; Group B – mastitic animals. Values are presented as LSM ± SEM

Parameter	Group A	Group B
Dry-off
ROS	51.87a, 1 ± 0.85	54.85a, 1 ± 1.87
SAC	447.31a, 1 ± 2.52	431.64a, 1 ± 5.52
OSi	0.117a, 1 ± 0.002	0.127a, 1 ± 0.005
Calving
ROS	65.89a, 2 ± 0.86	75.04b, 2 ± 1.87
SAC	347.38a, 2 ± 2.54	312.38b, 2 ± 5.52
OSi	0.191a, 2 ± 0.002	0.240b, 2 ± 0.005
30 d post-partum
ROS	53.46a, 1 ± 0.86	57.07a, 1 ± 1.87
SAC	451.42a, 1 ± 2.54	440.36a, 1 ± 5.52
OSi	0.118a, 1 ± 0.002	0.130a, 1 ± 0.005

^a,b Different superscripts within the same row indicate significant difference (P < 0.001) between the two groups. ^1,2 Different superscripts within the same column for the same parameter indicate significant difference (P < 0.001) between sampling points