Wet Milling Corn

Corn Cleaned Steeping

Steep water Wet corn Germ Grind Degerm

Condensed Wash Oil Germ

Corn bran Starch & Protein meal

Ethanol Corn Corn glutensweeteners meal

Corn gluten feed

Components of cornStarch 61.0%Corn oil 3.8%Protein 8.0%Fiber 11.2%Moisture 16.0%

Wet mill, lbs/buStarch 31.5Gluten feed 12.5Gluten meal 2.5Oil 1.6

Gluten feed Gluten meal Germ mealProtein 21 60 20Fat 2.5 2.5 2Fiber 8 1 9.5

Dry Milling Corn

Corn Ground Heated + Water Enzyme(Starch Dextrins

Glucose)

Fermentation Yeast enzyme(Sugar Ethanol)

Stillage Ethanol

Wet grains Centrifuge Distillation

WDGS Solubles

Components of cornStarch 61.0%Corn oil 3.8%Protein 8.0%Fiber 11.2%Moisture 16.0%

Dry millEthanol 2.7 galDry distill grains 18 lbsCO2 18 lbs

Dist grains with sol Dist SolProtein 27 29Fat 11 9Fiber 9 4

                                                                                                         

                                                                                                                                                                                                                          

                                                                 

                                                                                                                     

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Iowa Ethanol Production(millions of gallons)

U.S. Ethanol Production(millions of gallons)

How Much CDG Can be Fed to How Much CDG Can be Fed to Dairy Cows?Dairy Cows?

Recommend max. of ~ 20% of ration DM

e.g. ~10-13 lb/d of Dried; ~30-40 lb/d of Wet

Usually no palatability problems

Can usually formulate nutritionally

balanced diets

At 30% of DM:

May decrease DMI, especially if Wet CDG

May feed excess protein

David J. Schingoethe

Dairy Science Department

South Dakota State University

Example Ration Considerations Example Ration Considerations for Dairy Cattlefor Dairy Cattle

• Diets containing 50:50 forage:concentrate1) If equal proportions of Alfalfa & Corn Silage:

CDG can replace most or all protein suppl.2) If mostly corn silage:

More CDG can be fed but may need some other protein supplement, check Lys, & P

3) If mostly alfalfa:Less CDG likely needed to supply diet CP

As protein source, 8 to 15% of ration DM

As an energy source, > 15% of ration DM

May reduce acidosis because highly digestible fiber in place of starch

Wt gains & feed efficiency of cattle fed wet distillers grains usually better than with corn

Wt gains and feed efficiency of cattle fed dry distillers grains usually similar to corn

At 15 to 25% of ration DM, wet distillers grains has it greatest value

Protein and energy in distillers grains have value

DM intake may be reduces when wet distillers grains fed @ > 30% of ration DM

Probably feeding excess proteinFeeding excess PP does not have value for finishing cattle fed corn

Corn Distillers Grains for Finishing Cattle

Corn Distillers Grains for Cattle Fed Roughages Growing cattle – Cows – Calves

• Energy, protein and P have valueComplements roughagesLess starch – No negative associative effectsEnergy should be greater than corn

• Feed to supply supplemental needs for protein and energy