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Feed Value of Corn at Various Maturity Stages
Crude protein, fiber, and ash are higher in immature grain, however it has very low test weight. Gross energy does not change with test weight changes. Listed below is the nutrient composition of corn grain at different stages. A point to remember is the drying rate of immature corn might take many weeks, for the drying rate of corn that is physiological mature is approximately 0.5% a day. This would result in a 2 week span between physiological maturity and harvest maturity.
| Early Milk | Early Dough | Mid Dent | Phys Mature | |
| Nutrient | Concentration in Dry Matter % | |||
| Dry matter | 20.9 | 35.7 | 55.5 | 76.6 |
| Crude Protein | 16.6 | 12.5 | 10.7 | 10.9 |
| Crude fiber | 5.4 | 3.3 | 2.5 | 2.1 |
| Crude fat | 3.0 | 4.0 | 4.8 | 4.9 |
| Ash | 2.8 | 2.3 | 1.7 | 1.5 |
| Starch | 47.4 | 55.0 | 58.7 | 63.7 |
| Gross Energy (kcal/kg) | 4650 | 4540 | 4590 | 4580 |
| Test Weight | 35 | 47 | 55 | 58 |
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