Acid-base, electrolyte and oxidative status in dairy cows at different stages of the production cycle

Previous studies in the field of acid-base and oxidative status cows have mainly focused on transition period (three weeks before three after calving). The aim this study was to determine differences parameters electrolyte balance not only during period, but also at other stages production cycle. Holstein-Friesian were divided into four numerically equal groups (n = 6): early lactating (9?2 days milk - DIM), peak (50?5 late (170?10 DIM) dry (10?1 Venous blood samples taken from analyze status, concentrations stress parameters, compare group means. Significantly higher pH observed than cows. Sodium (Na+) concentration significantly lower compared cows, while chloride (Cl-) Plasma glutathione peroxidase (GSH-Px) activity Thus, highest pH, lowest Na+ Cl- serum GSH-Px groups, indicating metabolic period. In conclusion, it would be useful consider inclusion these standard health assessment procedures intensive dairy production.