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Recommended Minimum Dietary Protein Concentrations for Dairy Cows at Various Levels of Production<sup ></sup>

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

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	Dietary Protein Requirements (% of Dry Matter)
	__________________________________________________________________________________________
	Large-breed Cows		Small-breed Cows
	______________________________________________		_______________________________________________
Milk Production (kg/day)	Crude Protein^a	Metabolizable Protein^b	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).