Whole Corn / Cracked Corn
Primary high-energy grain — highest TDN of common grains; drives rate of gain and fat deposition in finishing phase
Always read and follow product labels for feeding and sheep safety.
Overview
Corn is the highest-energy grain available for show lambs, with TDN values of 88–90% — the “fuel” of any show lamb ration. Its primary job is pushing rate of gain and building the fat cover (finish) that judges evaluate at the end of the program. In eastern and midwestern programs where corn is locally abundant and cheap, it is typically the dominant grain. Use cracked corn for lambs under ~50–60 lbs; whole corn is acceptable for heavier lambs. The critical limitation: corn is extremely high in phosphorus relative to calcium, making it the primary urinary calculi risk ingredient in wether programs. Limestone supplementation is mandatory in any corn-heavy wether ration.
Nutritional Profile
| Nutrient | Value (dry matter basis) |
|---|---|
| Crude Protein | 8–9% |
| Crude Fat | 3–4% |
| Crude Fiber | 2–3% |
| TDN | 88–90% |
| Calcium | ~0.03% (very low) |
| Phosphorus | ~0.27–0.30% |
| Ca:P Ratio | ~1:10 (severely phosphorus-dominant — calcium correction required) |
Sheep Safety
Copper: No concern — corn contains no added copper and is safe for sheep.
Urinary calculi (wethers) — HIGH RISK: This is the most important safety note for this ingredient. Corn has one of the worst Ca:P ratios of any common feed ingredient (approximately 1:10). A wether ration with significant corn inclusion MUST include:
- Limestone (calcium carbonate) — supplement to achieve minimum 2:1 Ca:P in total ration
- Ammonium chloride — at 0.5% of total ration to acidify urine and prevent stone formation
- Fresh water at all times — dilutes urine and reduces stone concentration
- Loose salt — encourages water intake
Failure to balance Ca:P in a corn-heavy wether ration is a leading cause of urinary calculi deaths in show lambs.
Rumen acidosis: Corn is a rapidly-fermenting, high-starch grain. Introduce in increments no larger than 0.25 lb/head/day per week. Do not grind fine — coarse-cracked or whole corn only. Maintain access to long-stem hay to buffer rumen pH. Signs of acidosis: off feed, bloating, lethargy, loose stool.
Show Circuit Use
Primary Role in Program
Corn’s high energy density makes it the go-to ingredient for pushing rate of gain in the growing phase and building fat cover in the finishing phase. In finishing-phase programs (final 4–8 weeks), corn often comprises 40–60% of the total grain mix. Experienced feeders use corn strategically: lighter early on to support muscle development, heavier in finishing to layer on the fat cover that creates a finished, market-ready appearance.
Typical Feeding Rates by Phase
| Phase | Form | Rate |
|---|---|---|
| Growing (50–100 lbs) | Cracked/whole | 0.5–1.0 lb/day in grain mix |
| Finishing (100 lbs – show) | Whole (acceptable) | 1.0–1.5 lb/day; 40–60% of grain mix |
| Pre-show flush | Whole | Hold steady or reduce slightly; adjust other components |
How to Feed
Dry, mixed into total ration. Cracked corn is recommended for lambs under 50–60 lbs. For heavier lambs, whole corn is acceptable — sheep shell corn adequately during chewing and performance is comparable to cracked. Never feed finely ground corn — the rapid starch fermentation significantly raises acidosis risk and reduces palatability.
Phase Protocols
Growing Phase | Introduce and Build
- Rate: Start at 0.25–0.5 lb/day; increase by 0.25 lb/week toward target
- Calcium supplement: Add limestone from day one — do not wait until corn rate is established
- Purpose: Contribute energy to growing ration without overwhelming the rumen early
Finishing Phase | Push Condition
- Rate: 1.0–1.5 lb/day as part of grain mix
- Limestone: Increase proportionally as corn inclusion increases
- Purpose: Drive final fat deposition and rate of gain in the critical finishing window
Stacking & Combinations
Corn + rolled barley: Standard grain combination in programs where both are available. Corn drives energy and fat; barley contributes slightly more protein. Common in midwestern programs as a 50:50 blend or heavier corn in finishing.
Corn + soybean meal: Core base ration for meeting protein targets. Corn provides energy; soybean meal brings protein up to 14–18% target. Add limestone for Ca:P correction.
Corn + alfalfa pellets + beet pulp: The commodity “safety stack” — alfalfa and beet pulp both contribute significant calcium to offset the phosphorus load from corn. This three-ingredient combination significantly reduces urinary calculi risk compared to corn-only programs.
Corn + soy hull pellets: Soyhulls dilute the starch density and improve Ca:P ratio while contributing digestible fiber energy. Good safety pairing for high-corn rations.
Limestone Supplementation Guide
When corn is a primary ration ingredient, add limestone to correct Ca:P:
- Rate: Approximately 0.5–1 oz of ground limestone per lb of corn in the ration
- Method: Premix into the grain blend before feeding
- Target: Minimum 2:1 Ca:P ratio in total ration (confirm with a nutritionist or ration-balancing tool for your specific mix)
- Ammonium chloride: Add at 0.5% of total ration dry matter — this is in addition to limestone, not a replacement
Sourcing & Cost
Bulk shelled corn from grain elevators is one of the cheapest feed ingredients available per unit of TDN. Cracked corn is available bagged from most farm supply stores. In corn-belt states, this is typically the most economical high-energy grain. In western states, barley may be more economical.
Community Tips
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