Week at sample collection
  Week 1 Week 2 Week 3 Week 4 Week 5
  GSH-Px Summer 98.7 ± 15.0a 140.5 ± 6.3a 70.5 ± 5.5a 74.9 ± 3.9 70.4 ± 4.8a
Fall 41.6 ± 3.3b 52.2 ± 3.9b 36.4 ± 2.4b 65.5 ± 4.0 39.2 ± 2.6b
  SOD Summer 9.1 ± 0.6 9.8 ± 1.0 11.4 ± 1.5A 19.8 ± 1.0a 12.6 ± 1.0A
Fall 7.7 ± 0.4 10.1 ± 1.2 4.0 ± 0.2B 8.6 ± 0.9b 18.0 ± 1.0B
  TBARS Summer 8.1 ± 0.6 5.2 ± 0.5A 7.9 ± 1.0 4.9 ± 1.0 7.7 ± 1.3
Fall 7.5 ± 0.8 8.5 ± 1.2B 6.9 ± 0.7 4.1 ± 0.9 6.3 ± 0.5
a,b Means within column with different superscripts for each measured parameters are different (P<0.05).
A,B Means within column with different superscripts for each measured parameters are different (P<0.05).
Table 1: Mean ± SEM for activities of plasma glutathione peroxidase (GSH-Px;nmol/min/ml) and superoxide dismutase (SOD; units/ml), and concentration of thiobarbituric acid reactive substances (TBARS; nmol/ml) in Jersey calves born and raised in summer or fall.