Summary and Implications
Four complete feedlot rations between 41 & 48 Mcal/cwt Net Energy Gain (NEg) containing corn coproducts were analyzed to determine total percent sulfur on a dry matter basis (DMB). Ration sulfur level averaged 0.37% and ranged from 0.28-0.50%. Water sulfur content averaged 134 ppm and ranged from 98-205 ppm. The College of Veterinary Medicine spreadsheet to determine total sulfur intake calculated that the 650 pound steer consuming 20 pounds of a 44 Mcal/cwt NEg ration with 0.37% sulfur and water with 134 ppm sulfur was consuming 0.46% total sulfur intake. Twenty percent of the total sulfur comes from the water. Nine complete feedlot rations containing corn co-products were analyzed between 50 & 58 Mcal/cwt NEg to determine total percent sulfur on a DMB. Ration sulfur averaged 0.33% and ranged from 0.21-0.46%. Water sulfur content averaged 32 ppm and ranged from 5-83 ppm. The College of Veterinary Medicine spreadsheet to determine total sulfur intake calculated that the 800 pound steer consuming 24 pounds of a 55 Mcal/cwt NEg ration with 0.33% sulfur and 32 ppm sulfur water was consuming 0.35% total sulfur intake.
Iowa State University
DeWitt, Dennis; Ensley, Steve; Imerman, Paula; Doran, Beth; Kohl, Kris; and Summer, Paul
"Evaluation and Observations of Total Sulfur Intake with
Corn Co-Product Diets for Feedlot Cattle,"
Animal Industry Report:
AS 654, ASL R2295.
Available at: http://lib.dr.iastate.edu/ans_air/vol654/iss1/44