Week 7
Dairy: Heifers |
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Nutrient Requirements
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- Energy (units = Mcal or kg)
- Net energy for maintenance (NEM)
- Net energy for gain (NEG)
- Total Digestible Nutrients (TDN)
- Crude protein (CP) (units = grams)
- Minerals
- Vitamins
Nutrient Requirements - Energy
- Requirement for all animals is related to surface area
- Body weight raised to the 2/3 or 3/4 power is most common
- NEM (Mcal/d) = 0.86 x BW0.75
- Growth
- Depends on rate of gain
- Goal is = 1.7 lb ADG
- Goal is calve at 24 mo of age at 1350 lb
- 1265 lb/730 days = 1.7 lb ADG (780 g/d)
- NEG (Mcal/d) = 0.035 x BW^0.75 x (ADG/1,000) + 1.0 x ADG/1,000
- Requirement per unit gain increases as BW increases
Nutrient Requirements - Protein
- Depends on rate of gain
- Requirement per unit gain increases as BW increases
Net Energy Requirement
Heifer Body Weight
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