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Minnesota, sulfur and copper
I didn't do a full work up on your mineral needs but here is some info You should know.
Based on this alone IMO you should not be feeding any supplemental sulfur and should be supplementing with only salt and copper and zinc. ( trace mineral blacks )
In short: You are in an area that has natural excess sulfur and low copper and zinc. Adding more sulfur blocks the absorption of copper and makes your situation worse.
You need to limit/reduce sulfur and add copper and zinc.
See the analysis on Sulfur blocks, salt blocks and trace mineral blocks.
MN: “In these studies, the base forage was deficient in copper and zinc.”
“ . A total of 13%, 8% and 8% of the forage samples had sulfur, iron and molybdenum , respectively, at
sufficiently high concentrations to cause antagonisms.
Sulfur is a part of the essential amino acids methionine and cystine, which make up protein. A sulfur deficiency in beef cattle diets is not likely to occur under normal feeding conditions. Sulfur is more likely to be in excess, which can interfere with the metabolism of copper, resulting in a copper deficiency. Also, excess sulfur can reduce feed intake and cause a brain lesion condition known as polioencephalomalacia (PEM). Certain by-products such as distillers grains and corn gluten feed contain higher concentrations of sulfur, which should be taken into account in ration balancing. Sulfur is often added indirectly to the mineral mix through sulfate forms of the microminerals.