Energy

The energy content of a feed or forage has been most commonly estimated using regression equations based on acid detergent fiber (ADF). The 2001 Dairy NRC[2] has adopted a summative equation approach to determine feed TDN (total digestible nutrients) at 1x maintenance. The components used in this equation are the truly digestible nonfiber carbohydrate (NFC), CP, fatty acids, and neutral detergent fiber (NDF) components of the feed. The digestible energy (DE), metabolizable energy (ME), and

Table 1 Daily nutrient requirements and partition of nutrient use

Milk, kg/day

NE-l required, Mcal/daya

% of NE-l intake used for maintenance

MP required, g/dayb

% of MP intake used for maintenance

20

24.5

43.7

1,579

43.3

30

31.4

34.0

2,129

36.9

40

38.3

27.9

2,679

33.1

50

45.2

23.7

3,230

30.7

60

52.1

20.5

3,678

27.0

aNet energy lactation. bMetabolizable protein. (Adapted from Ref. 2.)

aNet energy lactation. bMetabolizable protein. (Adapted from Ref. 2.)

net energy (NE) values for feeds are calculated from the TDN 1 x values using a series of equations.

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