Merck Manual

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Recommended Minimum Dietary Protein Concentrations for Dairy Cows at Various Levels of Production a

Recommended Minimum Dietary Protein Concentrations for Dairy Cows at Various Levels of Production a

Dietary Protein Requirements (% of Dry Matter)

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Large-breed Cows

Small-breed Cows

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Milk Production (kg/day)

Crude Proteinb

Metabolizable Proteinc

Crude Protein

Metabolizable Protein

18

15.0

12.9

23

16.4

13.1

27

14.5

11.0

17.5

13.3

32

15.0

11.2

18.4

13.3

36

15.8

11.5

19.0

13.3

40

16.5

11.7

45

17.3

11.9

50

17.8

12.0

55

18.3

12.1

a This table is intended to provide a general reference for initial evaluations of dairy diets, not a standard against which rations are balanced. Calculation of dietary metabolizable protein concentrations generally requires specialized software.

b Crude protein requirements were generated by Spartan Dairy 3.0 (Michigan State University), assuming a mature cow in mid lactation.

c Metabolizable protein requirements were generated by the Nutrient Requirements of Dairy Cattle Computer Program that accompanies Nutrient Requirements of Dairy Cattle, 2001, National Academy of Sciences, National Academy Press, Washington, DC.