Effects of Elevating Zinc Supplementation on the Health and Production Parameters of High-Producing Dairy Cows.

This study's objective was to determine the effects of increasing the dietary added zinc () on the milk production, milk somatic cell count (), and immunoglobulin and antioxidant marker concentrations in the blood of dairy cows. Twelve Holstein cows (67 ± 2.5 days in milk) were assigned randomly to (1) a diet containing Zn-methionine at 76 mg/kg of DM () or (2) CTL top-dressed with about 21 mg/kg of DM extra Zn-methionine () for 70 d.