MSD Manual

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

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

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 Proteina

Metabolizable Proteinb

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

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.

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

bMetabolizable protein requirements were generated by NRC Model Software for Nutrient Requirements of Dairy Cattle (National Research Council, 2001).