University of Missouri Extension

G2807, Revised April 2003

Feeding Horses

Wayne Loch
Department of Animal Sciences

In balancing rations for horses, the goals are to furnish horses with a daily supply of nutrients in the correct amounts to prevent digestive upsets and to use feedstuffs that are palatable, easily obtained and economical.

Horses are, by nature, consumers of forage. Under natural conditions, they spend several hours a day grazing. Basing rations on adequate amounts of good quality roughage will minimize digestive disturbances such as colic. We can supplement hay or pasture with the correct amount of the right concentrates to meet requirements for energy, protein, minerals and vitamins.

Determining correct nutrient levels

Feeding horses is both an art and a science. Individual horses vary considerably in their nutrient requirements, but a table of these requirements forms a useful basis for formulating rations.

All horses require nutrients to maintain body weight and to support digestive and metabolic functions. In some cases they need additional nutrients for growth, work, reproduction or lactation.

Tables of nutrient requirements for horses are expressed in two ways,

Most horses receive their daily ration in two parts: roughage (hay or pasture) and concentrates. The concentrate portion contains grain and may include a protein supplement, minerals and vitamins. It may also include bran, cane molasses, dehydrated alfalfa or other feedstuffs.

Our problem, then, is as follows:

Roughage for horses

Adequate amounts of roughage in the ration decrease the risk of colic and laminitis. Roughage also helps maintain the correct calcium-to-phosphorus ratio, because grain is low in calcium and because roughages — especially legumes — are high in calcium. Rations should always contain more calcium than phosphorus. Calcium:phosphorus ratios between 1.1:1 and 2:1 are within an acceptable range. Even higher calcium levels can be tolerated; but when phosphorus levels are higher than calcium, severe skeletal abnormalities may result.

Adequate hay in the ration of horses kept in stalls also is beneficial because they eat it over a longer time span than grain. It aids in preventing vices such as wood chewing, which horses do when bored or when they lack roughage.

A good rule of thumb is to feed at least 1 pound of hay per day for every 100 pounds body weight of the horse. A 1,000-pound horse would be fed about 10 pounds of hay per day. Mature, idle horses in good condition, fed excellent hay in increased quantities (about 2 pounds per 100 pounds of body weight) may do well without grain added to their ration. Growing or working horses, mares during late pregnancy and mares during lactation need grain and other concentrates in addition to the roughage.

Alfalfa, red clover and lespedeza are examples of legume hays you can feed to horses. Brome, orchardgrass and timothy are examples of nonlegumes (grasses).

Fescue hay infected with the endophyte fungus Neotyphodium coenophialum causes reproductive problems in mares if fed during late pregnancy. It is also low in energy unless it is harvested before it becomes mature. If harvested before it gets too mature, however, it usually works for mature geldings or open mares, providing they have adequate supplementation.

Concentrates for horses

Historically, oats have been the first choice of feeds. Oats are medium in energy, require little or no processing and have more protein than most grains. However, they are variable in energy content. You should avoid oats with a light weight per bushel because of their low energy and high fiber content. The best oats usually come from the north central states such as Minnesota, North and South Dakota and northern Iowa.

Corn is fine for feeding horses, but is highly concentrated in energy. You must take care not to overfeed it. Wheat and grain sorghum (milo) are less suitable for feeding horses. Wheat is especially dangerous because it causes colic by impacting in the gastrointestinal tract.

A 50:50 ratio of corn and oats combines the safety of oats with the economy of corn. It is often recommended for horses.

Some horse feeding/management recommendations

Ration number 1
Foal creep ration (MU tests)
Crude protein = 18 percent; Calcium = 0.88 percent; Phosphorus = 0.60 percent

Ingredients 1/2 ton 1 ton
Oats, crimpled or crushed 440 880
Corn, coarsely cracked 220 440
Soybean meal, 44 percent 240 480
Molasses, liquid 70 140
Dicalcium phosphate 15 30
Limestone 10 20
Salt, trace mineral 5 10
Vitamin premix1 1 2
Total, pounds 1,001 2,002
1A premix furnishing 8 million IU of vitamin A, 1 million IU of vitamin D and 150,000 IU of vitamin E per ton of feed.

Please note
Feed this grain ration free-choice with good legume hay to foals from two weeks of age to weaning or to early weaned foals from 3 to 8 months of age.
Do not continue weaned (or older) foals on this feed because it is too high in protein and calcium unless fed with non-legume hay up to a year of age at which time (or sooner) it should be replaced with MU Ration number 2 for weanlings.
Be sure preparation of the ration does not result in dust or "fines."

Ration number 2
Weaning horse ration (MU tests)
Crude protein = 16.31 percent; Calcium = 0.75 percent; Phosphorus = 0.55 percent

Ingredients 1/2 ton 1 ton
Oats, crimpled or crushed 440 880
Corn, coarsely cracked 270 540
Soybean meal, 44 percent 190 380
Molasses, liquid 75 150
Dicalcium phosphate 10 20
Limestone 5 10
Salt, trace mineral 5 10
Vitamin premix1 1 2
Total, pounds 1,001 2,002
1A premix furnishing 8 million IU of vitamin A, 1 million IU of vitamin D and 150,000 IU of vitamin E per ton of feed.

Note
Feed this grain ration to weanlings. Add good legume or at least half legume hay at 1 to 1-1/2 pounds of grain per 100 pounds of body weight. Feed hay free-choice.
Do not stuff weanlings with 15 to 20 pounds of any grain feed.
If you "cut" this ration by feeding half oats or half corn with it, the level of calcium will be too low unless excellent alfalfa hay is fed free-choice.
Change to MU Ration number 3 by 14 to 16 months of age for better growth and economy.

Ration number 3
Yearling, 2-year-old, late pregnancy and lactating mare ration (MU tests)
Crude protein = 14.3 percent; Calcium = 0.61 percent; Phosphorus = 0.43 percent

Ingredients 1/2 ton 1 ton
Oats, crimpled or crushed 440 880
Corn, coarsely cracked 340 680
Soybean meal, 44 percent 130 260
Molasses, liquid 70 140
Dicalcium phosphate 5 10
Limestone 10 20
Salt, trace mineral 5 10
Vitamin premix1 1 2
Total, pounds 1,001 2,002
1A premix furnishing 8 million IU of vitamin A, 1 million IU of vitamin D and 150,000 IU of vitamin E per ton of feed.

Please note
Feed this ration at the beginning of the yearling year with good legume or at least half legume hay or good pasture. Regulate intake to control the desired degree of condition. Four to eight pounds daily should suffice.
As growing horses approach 18 months of age, non-legume hay is sufficient with adequate grain to maintain condition.
Feed mares in late pregnancy and early lactation 6 to 10 pounds of grain as needed to regulate condition and sustain good milk production. If no pasture is available, feed good mixed hay free-choice.
If mares are obese in late pregnancy, they need no grain but may be maintained on quality legume or mixed or nonlegume hay.

Ration number 4
Adult horse, early pregnancy and late 2-year-old ration (MU tests)
Crude protein = 11.0 percent; Calcium = 0.43 percent; Phosphorus = 0.36 percent

Ingredients 1/2 ton 1 ton
Oats, crimpled or crushed 500 1,000
Corn, coarsely cracked 390 780
Soybean meal, 44 percent 30 60
Molasses, liquid 65 130
Dicalcium phosphate 3 6
Limestone 7 14
Salt, trace mineral 5 10
Vitamin premix1 1 2
Total, pounds 1,001 2,002
1A premix furnishing 8 million IU of vitamin A, 1 million IU of vitamin D and 150,000 IU of vitamin E per ton of feed.

Please note
This ration is designed for adult and 2-year-old idle and working horses and for mares until the last three months of pregnancy. It may be fed with either legume or non-legume, but non-legume hay will result in fewer digestive upsets with hard working horses consuming large amounts of grain.
This ration is too low in protein, calcium and phosphorus for weanlings and lactating mares and is marginal in these nutrients for mares in late pregnancy (Rations 2 and 3).

Table 1
Daily nutrient needs, 1,100-pound mature weight (as-fed basis).

Mature horses
At maintenance

Mares
Last 90 days of gestation

Lactating mare
First two months

Lactating mare
Three months to weaning

Creep feed
(supplemental)

Weanling
Four months

Weanling
six months
Moderate growth

Weanling
Six months
Rapid growth

Yearling
12 months
Moderate growth

Yearling
12 months
Rapid growth

Long yearling
18 months
Not in training

Long yearling
18 months
In training

Two-year-old
Not in training

Two-year-old
In training

Mature working horses
Light work

Mature working horses
Moderate work

Mature working horses
Intense work

G2807, revised April 2003

G2807 Feeding Horses | University of Missouri Extension

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