A deficiency is not likely to occur in diets high in forages. Potassium supplementation will likely be warranted only on high grain, feedlot type rations. Sulphur Most home grown feeds contain adequate amounts of sulphur to meet the needs of growing animals as well as dry pregnant beef cows. Lactating cows may be marginal in sulphur, in particular the heavy milkers. In areas where water is high in sulphates, excess sulphur can be a problem.
Excess sulphur can interfere with the absorption and utilization of other nutrients.
Of particular interest in Alberta are the problems caused with copper and selenium use in the animal. An adequate supply must be available at all times. A prolonged deficiency can result in loss of appetite, unthriftiness and a drop in milk production. Choosing a mineral Feed analysis is the easiest method for determining which minerals the feed is low in, and is invaluable in helping to determine which mineral mixes will best meet your needs. Probably the most common mineral type used in Alberta High calcium low phosphorus Most appropriate for high grain rations.