RUMINANTS, cilt.5, sa.35, ss.35, 2025 (SCI-Expanded, Scopus)
This study investigated how low ruminal pH affects the blood concentrations of macrominerals,
trace elements, and vitamins and the oxidative status of dairy cows in early lactation.
Ruminal pH often drops below 5.5 during the day. Blood samples and ruminal fluid were
collected from 53 Holstein cows at three points in early lactation (days 30, 90, and 150). The
obtained results show that low pH did not significantly affect most minerals, vitamins, or
oxidative stress markers. However, cows with low pH had higher levels of copper, iron,
and cobalt in their blood—especially by day 150. In brief, low ruminal pH changes some
trace minerals but does not impact overall vitamin levels or oxidative status.