Long-term feeding of high zinc sulfate diets to lactating and gestating dairy cows.

@article{Miller1989LongtermFO,
  title={Long-term feeding of high zinc sulfate diets to lactating and gestating dairy cows.},
  author={Wilmer J. Miller and H. E. Amos and R P Gentry and Derrick Blackmon and R M Durrance and C T Crowe and Anitra Fielding and M W Neathery},
  journal={Journal of dairy science},
  year={1989},
  volume={72 6},
  pages={1499-508}
}
Thirty dairy cows, fed a control diet consisting of silage and concentrates, were given either 0, 1000, or 2000 ppm of supplemental Zn (DM basis), from zinc sulfate monohydrate (ZnSO4.H2O) for most of a lactation. Feeding 2000 ppm Zn decreased milk yield and feed intake after several weeks. Some cows were affected more severely than others. Generally, primiparous animals were more tolerant of the high Zn diet than multiparous cows. Milk Zn was materially higher for cows fed 1000 ppm added Zn… CONTINUE READING