MSD Manual

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Example Dietary Characteristics for Growing Replacement Heifers

Example Dietary Characteristics for Growing Replacement Heifers

Body Wt (kg)

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100

150

200

250

DMI (kg/day)

3.1

4.2

5.2

6.1

Concentrates (% of dry matter)

40

20

5

0

Forage (% of dry matter)

60

80

95

100

Crude protein (% of dry matter)

21

20

18.5

18.4

Metabolizable protein (% of dry matter)

11.7

9.6

8.5

7.7

RUP (% of crude protein)

32

28

22

21

RDP (% of crude protein)

68

72

78

79

ME (Mcal/kg)

2.5

2.4

2.2

2.2

Based on requirements generated by NRC Model Software for Nutrient Requirements of Dairy Cattle (National Research Council, 2001). The crude protein requirements of animals <150 kg are relatively high and could be reduced by the use of protein sources with higher RUP proportions.

DMI, dry-matter intake; RUP, rumen undegradable protein; RDP, rumen degradable protein; ME, metabolizable energy.