Annual Forage Crops for Manitoba

Annual forage crops provide producers with additional options for hay, silage, or pasture—especially in years when perennial forage supplies are limited. Planning early in the growing season allows better use of early moisture, cooler temperatures, and the full range of available crop choices.
The Manitoba Crop Variety Evaluation Team (MCVET) annual forage trials run at four sites across the province including Melita, Roblin, Arborg and Carberry. The objective of the program is to test different varieties of annual crops for forage yield and quality across Manitoba. For results of the testing please go to Seed Manitoba 2026

 
Key Annual Forage Crop Options
Corn
Corn can be used for pasture, green chop, or silage.
Seeding:
  • 7–14 in (18–36 cm) row spacing; 50–100 lb/ac (56–112 kg/ha).
  • Double‑row planting is possible with wide‑row planters.
Use:
  • Pasture fields should be divided for rotational grazing.
  • Greatest feeding value is achieved when corn is harvested for silage at maturity.

 
Oats, Barley, Wheat & Rye
Fall Rye & Winter Wheat
  • Provide valuable early spring and late fall grazing.
  • Apply 50 lb/ac (56 kg/ha) N before spring regrowth.
  • Rye has higher carrying capacity but may cause off‑flavours in milk—remove dairy cows several hours before milking.
  • Spring‑seeded rye can also provide good summer grazing.
Oats
  • Spring‑seeded oats are ready for grazing in 6–8 weeks.
  • Can be grazed lightly early (vegetative stage) and regrazed after recovery.
  • High growth rates at boot stage require rotational grazing to limit waste.
  • Best annual emergency hay option; cut at early dough stage.
Barley
  • Higher dry matter yield than oats but less palatable—better suited for silage.
  • For hay or silage, mixing with peas (50% of seed weight) improves protein by 2–4%.
Cereal–Legume Mixes
  • Barley/peas or oats/peas produce high‑protein silage.
  • Adding barley to sudangrass or sorghum–sudan hybrids improves silage dry matter.

 
Sorghum Forages (Sudangrass, Sorghum–Sudan Hybrids, Sorghum)
Warm‑season crops suited for hot, dry conditions.
  • Generally drought‑tolerant and productive, but slightly lower feeding value than corn.
  • Sudangrass has thinner stems and is preferred for pasture/hay.
  • Sorghum–sudan hybrids are better for green chop and silage due to higher biomass.
  • All regrow well after cutting or grazing.
Seeding:
  • Around June 1; 1–2.5 in (2.5–4 cm) depth.
  • Delay seeding until soil reaches >10°C.
  • Recommended row spacing: 7–14 in (18–36 cm).
Caution – Prussic Acid:
  • Levels increase in new growth, drought‑stressed plants, and after frost.
  • Do not graze until plants reach 18–24 in (46–61 cm).
  • After frost, allow plants to dry thoroughly before grazing.
Weed Control: No fully effective herbicide options available.

 
Millets
  • Similar feeding value to sudangrass but lower yield.
  • Best seeded in early June at 20–25 lb/ac (22.5–28 kg/ha).
  • Easier to cure for hay than sudangrass.
  • Limited regrowth makes millet less suited for frequent grazing.
  • Peas (½ bu/ac) can improve forage quality.
Types:
  • Siberian/Foxtail Millet: Higher yield and better leaf‑to‑stem ratio; cut at 65–70 days.
  • Proso Millet: Lower yield, coarser stems.
  • Delay seeding until soil reaches 10°C.

 
Ryegrass (Italian & Westerwold)
  • Suitable for pasture and hay, depending on type.
  • Italian ryegrass: Leafy, ~16 in (40 cm), good for grazing.
  • Westerwold: Taller (16–32 in), suitable for hay or pasture.
  • Seed at 20 lb/ac (pure stands) or 8–10 lb/ac in mixes.
  • Produces high‑quality forage 6–8 weeks after seeding; best under good moisture.

 
Establishment & Management
Seedbed Preparation
  • Prepare a fine, firm seedbed to ensure shallow, uniform seeding.
Seeding Rates
  • Use higher rates under dry conditions or when plants are intended for grazing.
  • Moisture and nitrogen levels influence tillering/stooling.
Fertility
  • Base fertilizer on soil test recommendations.
  • Apply P and N with the seed only if crop‑safe.
  • Phosphorus supports root development—especially important in dry conditions.
Weed Control
  • Use recommended herbicides where available.
  • Refer to the Manitoba Guide to Crop Protection for product specifics.

 
Harvesting & Storage
Harvest Timing
  • Early cutting: high protein, high palatability, lower yield.
  • Later cutting: higher yield, lower protein.
  • Ensure correct moisture for storage to maintain quality.
Grazing Management
  • Avoid continuous grazing—results in waste, trampling, and lower pasture utilization.
  • Rotational or strip grazing increases yield and improves forage quality across all annual crops.
  • Crops under stress are more prone to nitrate accumulation—testing is essential before grazing or harvest.
Green Chop / Zero Grazing
  • Labour and equipment intensive but effective when forage quality and supply are critical.