How Many Bales of Hay Per Cow? (Feeding Guide)
Calculate how many bales of hay you need per cow for winter feeding. Covers round bales, square bales, daily intake, and storage waste factors.
A mature beef cow weighing 1,200 lbs eats approximately 2-2.5% of her body weight in dry matter per day, which equals 24-30 lbs of hay daily. Over a typical 120-day winter feeding period, that is 2,880-3,600 lbs of hay per cow. With 15-25% waste from feeding and storage, plan on 3,300-4,500 lbs per cow per winter.
A standard large round bale weighing 1,000-1,200 lbs provides about 800-1,000 lbs of usable feed after waste. That means you need approximately 3-5 round bales per cow for a 120-day feeding season. Extend to a 150-day season, and the number jumps to 4-6 bales per cow.
Small square bales weigh 40-60 lbs each and are easier to handle but more expensive per ton. At 50 lbs per bale, a cow consuming 30 lbs per day goes through roughly one bale every 1.5 days, or about 80 small square bales over 120 days.
Waste is the single biggest variable in hay feeding costs. Feeding round bales on the ground without a ring or rack results in 25-45% waste as cows trample, soil, and bed on the hay. A simple hay ring reduces waste to 5-15%. Cone-type feeders with sheeted bottoms can cut waste below 5%. At $60 per round bale, reducing waste from 30% to 10% saves approximately $36 per cow per winter.
Hay quality matters as much as quantity. Test your hay for crude protein and total digestible nutrients (TDN). Good-quality grass hay runs 8-12% protein and 55-60% TDN. Cows in late gestation or early lactation need hay with at least 10% crude protein or supplementation with range cubes or protein tubs.
For a 50-cow herd over a 150-day winter, you need 200-300 round bales of good-quality hay, assuming a hay ring is used and bales average 1,100 lbs. Always carry a 10-15% reserve above calculated needs to account for an extended winter, late spring, or a failed hay cutting.
Storage conditions directly impact how much hay you actually get to feed. Hay stored outside on the ground can lose 25-35% of its value to spoilage. Simply placing bales on pallets or gravel and wrapping the top with net wrap reduces loss to 5-10%. Barn-stored hay has under 5% loss but requires significant infrastructure investment.
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Frequently Asked Questions
How many round bales per cow for winter?
Plan on 3-5 round bales (1,000-1,200 lbs each) per cow for a 120-day feeding period. For a 150-day season, budget 4-6 bales. This assumes 10-15% waste with a hay ring feeder.
How much hay does a cow eat per day?
A 1,200-lb beef cow eats 24-30 lbs of hay per day (2-2.5% of body weight). Lactating cows eat at the higher end. In very cold weather, intake can increase by 10-15% as cows burn more energy to stay warm.
Is it cheaper to buy hay or grow your own?
Growing your own hay costs $30-$60 per ton in production costs but requires equipment investment. Purchased hay runs $80-$200 per ton depending on quality and region. If you have the land and equipment, growing is typically cheaper above 30-40 acres of hayground.