Week 7
Dairy: Lactating Cows |
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Minerals and Vitamins
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Required Minerals
- Macrominerals
- Fed as g per day expressed as % DM
- Microminerals (Trace)
- Fed as mg per day expressed as ppm (mg/kg DM)
- Co, Cu, Fe, I, Mn, Se, Zn
- Macrominerals
- Ca:P ratio
- P – Environment
- Electrolytes – Heat Stress
- K – Milk Fever
- Mg – Grass Tetany
Dietary Macrominerals
Dietary Mineral Concentrations
Milk |
Ca |
P |
Na |
Cl |
K |
Mg |
S |
lb/d |
% of
Diet DM |
100 |
0.60 |
0.37 |
0.21 |
0.26 |
1.04 |
0.19 |
0.20 |
75 |
0.56 |
0.34 |
0.21 |
0.24 |
1.02 |
0.18 |
0.20 |
50 |
0.52 |
0.31 |
0.22 |
0.22 |
1.00 |
0.16 |
0.20 |
Trace Mineral Requirements
Trace Minerals Requirements
Micromineral
|
PPM |
Co |
0.11 |
Cu |
15 |
I |
0.5 |
Fe |
15 |
Mn |
15 |
Se |
0.3 |
Zn |
60 |
Method of Feeding
- Force feeding - recommended method
- Optimal method is in TMR
- Use of grain carrier
- Free choice - cafeteria style
- Supplying unmixed supplements of Dical, salt, limestone, etc
Vitamins
- Required
- B vitamins produced in rumen
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