Managing phosphorus with distillers grains diets
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Managing Phosphorus with Distillers Grains Diets. Allen Trenkle Iowa State University. Managing Phosphorus in Cattle Diets. Establish requirements Use nutrient requirement tables – NRC Formulate diets to supply requirement Preferably analyze feeds

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Managing Phosphorus with Distillers Grains Diets

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Managing phosphorus with distillers grains diets

Managing Phosphorus with Distillers Grains Diets

Allen Trenkle

Iowa State University


Managing phosphorus in cattle diets

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


Nutrient requirements of growing cattle

Nutrient Requirements of Growing Cattle

N

g/day

P

Body Weight

800 lb steer 3.5 lb/d


Managing phosphorus with distillers grains diets

Phosphorus Requirement of Growing and Finishing Cattle – University of Nebraska

Gain, lbs/d Feed/gain

Dietary phosphorus, % dry matter (Yearlings – Calves)

Corn Corn


Managing phosphorus with distillers grains diets

Composition of Co-products

DGS = about 65% DG + 35% CDS

Nutrients in corn concentrated about 3 times in DGS

Replacing corn grain with distillers grains increases phosphorus intake


Managing phosphorus with distillers grains diets

Phosphorus MetabolismDigestion Trial -ISU Cattle Experiment


Managing phosphorus with distillers grains diets

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


Use of dgs in feedlot diets

Use of DGS in Feedlot Diets


Managing phosphorus with distillers grains diets

Land Area Required for Manure DisposalCorn - 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


Managing phosphorus with distillers grains diets

Land Area Required Corn ProductionManure Disposal - P


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