Markers of oxidative status in plasma and erythrocytes of transition dairy cows during hot season
Author(s)
Bernabucci, Umberto
Ronchi, Bruno
Lacetera, Nicola
Nardone, Alessandro
Date Issued
2002
Type
Article
Abstract
The study was carried out to assess whether hot seasons
affect the oxidative status of transition dairy cows.
Twenty Holstein cows were utilized. Eleven of those
cows gave birth in spring; the remaining nine cows gave
birth in summer. Oxidative status was evaluated from
21 d before to 35 d after calving, determining oxidative
markers in plasma [glutathione peroxidase activity,
thiol groups, reactive oxygen metabolites, and thiobarbituric
acid reactive substances (TBARS)] and in erythrocytes
[glutathione peroxidase activity (GSH-Px-E),
intracellular thiols (SH), superoxide dismutase activity
(SOD) and TBARS]. The season did not modify plasma
oxidative markers. In contrast, cows exposed to moderate
heat stress (39.5 ± 0.2°C rectal temperatures) due to
summer temperature-humidity index (73.2 ± 2.5 mean
daily THI), showed higher erythrocyte SOD, GSH-Px-
E, SH, and TBARS compared with spring cows, indicating
a condition of oxidative stress in summer transition
dairy cows. Some changes (the increase of SOD, for
example), represent compensatory changes the cow is
undergoing in response to increased oxidative stress.
Under the conditions compared, the effect of heat stress
on oxidative status in transition dairy cows by use of
plasma markers does not give enough information to
reach definitive conclusions. Erythrocytes are an appropriate
and sensitive model to study the oxidative status
of transition dairy cows exposed to hot environments.
Citation
Bernabucci, U. et al. 2002. Markers of oxidative status in plasma and erythrocytes of transition dairy cows during hot season. "Journal of Dairy Science" 85: 2173-2179
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