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Sulfur requirement of lactating dairy cows. 3. Fate of sulfur-35 from sodium and calcium sulfate.

Abstract Utilization of sulfur-35 from sodium sulfate and calcium sulfate was investigated with rations containing .06, .17, or .24% sulfur with two lactating dairy cows. Urea supplied 60% of the dietary nitrogen. These sources of sulfur allowed comparable milk production and feed intake for an average intake of 57mg of sulfur per kg per day. More sulfur from sodium sulfate was incorporated into casein than was sulfur from calcium sulfate. The mean turnover time of sulfur in milk, urine, and feces was 44h. Forty-nine percent of the labeled sulfur was excreted in the urine. Fecal excretion of the labeled sulfur was about 24% of the total intake. When sulfur-35 sulfates were administered to the cows consuming the basal low sulfur diet, more labeled material was excreted in urine when sulfur-35 labeled calcium sulfate was given than when the cows received sulfur-35 labeled sodium sulfate; however, this trend of excretion was reversed for fecal sulfur excretion.