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DR. Margaret, Ph.D.<br />

208-308-0106<br />

Dr. Margaret Winsryg, Ph.D. 208-308-0106 MNM Consulting Services<br />

Why We Feed Different Protein Sources to Our Horses?<br />

<strong>The</strong> protein needs of the horse vary according to use and age. <strong>The</strong> table below<br />

gives the minimum level needed for various types of horses. From the table<br />

it can be seen that protein needs are greatest for foals and for lactating mares. Work<br />

does not increase protein needs very much but does increase certain amino acids<br />

needs. For example, if we were feeding 18 lb. of a ration that is 13% protein to a mature<br />

horse and if we begin riding the horse hard, we would maintain a 13% protein level,<br />

but increase the total amount of feed (20 lb.) used to maintain the horse in good flesh.<br />

This would also increase the total amount of protein<br />

given and be sufficient to meet extra protein needs<br />

caused by work.<br />

Proteins are the building blocks of tissue and are<br />

composed of units called amino acids. Although there<br />

are 22 different amino acids that are needed for protein<br />

synthesis, several can be made by the tissues of the body.<br />

<strong>The</strong>re are 10 that must be supplied to the horse – arginine,<br />

histidine, isoleucine, leucine, lysine, methionine, phenylalanine,<br />

threonine, tryptophan, and valine. Lysine is the<br />

one most often lacking in growing horse rations<br />

Because of the high cost of protein, it is economically<br />

wasteful to feed more than is needed. <strong>The</strong> body breaks<br />

down excess protein to carbohydrates and urea. <strong>The</strong><br />

carbohydrates are used for energy or changed to fat and<br />

stored, and the urea is passed in the urine.<br />

It was previously mentioned that urea is a feed<br />

supplement fed by cattle feeders that a cow can use to<br />

make protein in the rumen. Horses cannot use urea as a<br />

protein source, and feeds with their protein level based on<br />

urea will not reflect an accurate protein level for the horse.<br />

In addition to cost, another possible detriment of excess<br />

protein is that it produces more body heat in breaking<br />

the proteins into energy as compared to using carbohydrates<br />

or fats for energy. This could be a problem for the<br />

endurance trail horse that has to keep as cool as possible as he works long and hard. Current<br />

research has shown that feeding a diet containing 10% added fat reduces the daily heat load<br />

by 5%, which may benefit hard working horses, particularly in hot weather. <strong>The</strong>refore, high<br />

protein rations are not recommended for these horses.<br />

Occasionally horses will develop hives, commonly called protein bumps, on the skin.<br />

<strong>The</strong>se can be an allergic reaction of the body to foreign proteins in the feed but are more<br />

likely are the result of skin contact with some chemical in the bedding. Insect bites also<br />

cause these hives. Generally, the hives are short lived and no serious problem occurs.<br />

High protein rations have also been blamed for the diseases such as epiphysitis and<br />

contracted tendons. <strong>The</strong>se problems are associated with fast-growing foals, as these foals<br />

are typically on high-protein high-energy rations that allow the foal to grow quickly. However,<br />

it is the imbalance or deficiency of other factors such as minerals that are the real<br />

culprits, not the protein.<br />

Plant Protein Supplements<br />

<strong>The</strong>se are basically the high-protein parts of grains that have had the oil removed for<br />

use in other industries.<br />

Soybean Meal<br />

This oil meal has the highest biological value and has a 44% to 48% protein content<br />

on an as-fed basis. <strong>The</strong> quality (biological value) of a protein supplement is based on a<br />

comparison of the amino acids that make up soybean protein to the amino acids required<br />

by the horse to make up his proteins. Not only do they need to have the same amino acids,<br />

Table. Minimum Crude Protein Requirement<br />

(Percent in Ration).<br />

but they should be present in the same relative percentages. Soybean meal is especially high<br />

in lysine, which is commonly low in most grains. Soybean meal is also usually the cheapest<br />

source of protein per unit of protein available for horse feeds.<br />

Soybeans should not be fed to horses in their raw form. In the raw form they contain<br />

an inhibitor of protein digestion in the horse. Raw soybeans are especially detrimental in<br />

foal rations.<br />

% In<br />

Ration<br />

% of Live Wt.<br />

Fed/Day*<br />

Mature idle horse 14.0 1.5<br />

Pregnancy (last 90 14.5 1.5<br />

days)<br />

Lactation (first 4 mos.) 14.5 2.0<br />

Foals (creep feed, 18.0 2.8<br />

nursing)<br />

Weanlings 16.0 2.3<br />

Yearlings (12 mos.) 14.0 1.9<br />

Yearlings (18 mos.) 13.0 1.7<br />

Two year olds 13.0 1.5<br />

* Percent of live weight fed is based on moisture-free<br />

feed. Actual percent of weight eaten will be higher on<br />

an as-fed basis. Also, if the horse eats more or less than<br />

this percent of its weight per day in moisture-free feed,<br />

the percent needs to be adjusted accordingly.<br />

Linseed Meal<br />

Linseed meal used to be in great demand for inclusion<br />

in feed rations for horses. This meal is high in sulfur-containing<br />

amino acids, which were thought to aid the quality<br />

of the hair coat. Actually, the quality of the hair coat came<br />

more from the oil in the meal. However, modern processing<br />

removes most of the oil, thereby decreasing its value<br />

for horse feeding. Linseed meal is about 35% protein as<br />

fed, costs more, and has a lower biological value than soybean<br />

oil meal. Linseed has been recommended in rations<br />

of horses that suffer from tying-up syndrome, because it is<br />

a good source of selenium, which helps maintain normal<br />

muscle function.<br />

Cottonseed Meal<br />

Cottonseed meal contains about 39% protein on an<br />

as-fed basis and is second to soybean oil meal in quality. If<br />

it is available and cost effective, it may be used for horses.<br />

Cottonseed meal contains a substance called gossypol that<br />

interferes with digestion and is particularly undesirable<br />

for feeding foals. Adult horses can tolerate the gossypol.<br />

Research in other species has shown cottonseed oil meal<br />

to decrease sperm production in males, and this effect is<br />

thought to occur in stallions, too.<br />

Other Sources<br />

Other protein sources such as sunflower and canola<br />

meals can be used in horse feeds. Also, brewers grains, distillers grains, and gluten are<br />

commonly used in horse feeds as protein sources.<br />

Animal Protein Supplements<br />

Animal protein supplements such as meat scraps or blood meal are not used in today’s<br />

feeds.<br />

Dr. Margaret Winsryg<br />

MNM Consulting<br />

Equine & Bovine Nutrition<br />

(208) 308-0106<br />

3290 N 2200 E, Twin Falls, ID 83301<br />

www.progressiverancher.com <strong>The</strong> <strong>Progressive</strong> <strong>Rancher</strong><br />

February 2011 35

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