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Managing Phosphorus with Distillers Grains Diets Allen Trenkle Iowa State University.

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Presentation on theme: "Managing Phosphorus with Distillers Grains Diets Allen Trenkle Iowa State University."— Presentation transcript:

1 Managing Phosphorus with Distillers Grains Diets Allen Trenkle Iowa State University

2 Managing Phosphorus in Cattle Diets Establish requirements Use nutrient requirement tables – NRC Formulate diets to supply requirement - Preferably analyze feeds - Tables of nutrient composition of feedstuffs Can estimate excretion using available spreadsheets Input for manure management planning Corn contains more than adequate phosphorus for cattle

3 Nutrient Requirements of Growing Cattle Body Weight g/day N P 800 lb steer 3.5 lb/d

4 Phosphorus Requirement of Growing and Finishing Cattle – University of Nebraska Dietary phosphorus, % dry matter (Yearlings – Calves) Corn Gain, lbs/d Feed/gain

5 Composition of Co-products DGCDSCorn Protein N Oil10204 NDF Starch Ca P K S DGS = about 65% DG + 35% CDS Nutrients in corn concentrated about 3 times in DGS Replacing corn grain with distillers grains increases phosphorus intake

6 Phosphorus Metabolism Digestion Trial - ISU Cattle Experiment

7 Phosphorus Excretion Steers fed control, distillers soluble or wet DG Feeding distillers co-products: Did not change P metabolism Increased P excretion Feeding DGS is a manure management issue

8 Use of DGS in Feedlot Diets Diet Composition DGS % DM Protein % Phosphorus %

9 Land Area Required for Manure Disposal Corn - Nitrogen Balance Assumptions: Manure added based on crop removal – corn yield 150 bu/acre 50% of manure N lost as ammonia 1000-head feedlot occupied 304 days/year

10 Land Area Required Corn Production Manure Disposal - P


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