Forage is the basis for feeding programs for all classes of horses. Forage contains many nutrients, and the fiber provided by forage is essential for the maintenance of the horse's gastrointestinal health. Hay and pasture are the typical forage sources for horses, but when growing or harvesting conditions limit their availability, horse owners have to consider alternative forage sources.
Forage cubes are gaining popularity as an alternative to feeding long-stem hay. The cubes available may be 100% alfalfa, a mixture of alfalfa and grass, or a more recent product which is a mixture of alfalfa and whole corn plant. Availability of the different products will vary with local suppliers. For most horse owners, 100% alfalfa cubes is the product most readily available. As with any feedstuff, there are advantages and disadvantages that must be considered when making your decision to use alfalfa cubes in feeding programs for your horses.
In general, there are two types of cubesdehydrated and sun-cured. Dehydrated cubes are made from alfalfa that is cut at an early stage of maturity and is partially dried in the field. The wilted alfalfa is picked up and chopped using a forage harvester. This material is transported to the processing plant where it is dehydrated to 95% dry matter and cubed. The sun-cured cubes are produced by allowing the alfalfa to dry in the field. The cured forage is then baled and transported to the processing plant, where it is chopped and cubed. The result of either processing method is alfalfa forage in a small package.
Alfalfa cubes are similar to long-stem hay in digestible energy, crude protein, and calcium content (Table 1). The use of alfalfa cubes eliminates the sorting of leaves from stems, so the cubed product provides a more uniform feed. Cube buyers always have nutrient information provided, as this product is sold with a nutrient guarantee. In most situations when long-stem hay is purchased, the horse owner may need to test the hay to determine the nutrient content.
|Table 1. Nutrient comparison between alfalfa hay and alfalfa cubes.a|
|Feed Type||Dry Matter %||Digestible Energy mcal/kg||Crude Protein %||Calcium %||Phosphorus %|
|aAll values are on a dry matter basis.|
bValues for the alfalfa hay are taken from the 1989 Nutrient Requirements for Horses.
cValues for the alfalfa cubes are based on industry values from cube manufacturers.
Research with alfalfa cubes has shown that cubes are effective as the forage component in horse diets. However, alfalfa cubes must be limit-fed, as voluntary intake is much greater for the cubes than for long-stem alfalfa hay. Horses fed to appetite consumed 17 to 25% more cubed alfalfa than long-stem hay.
Horses that are fed alfalfa cubes tend to eat all the cubes provided, whereas horses fed long-stem alfalfa hay will sort through the hay and not eat all the hay offered. Research in Colorado reported that mature horses fed alfalfa cubes maintained their body weight better than horses fed equal amounts of long-stem hay. The conclusion reached was that the horses fed the cubed alfalfa ate all the feed provided, while the horses fed the long-stem hay wasted a portion of the feed provided. Therefore, horse owners should provide alfalfa cubes in a controlled manner to prevent overconsumption of the feed, which can lead to serious digestive problems such as colic or problems associated with overweight horses.
Alfalfa cubes can be used in feeding programs to replace a portion or all of the forage that horse owners would feed their horses. Feeding suggestions using alfalfa cubes are found in Table 2.
|Table 2. Feeding suggestions for different classes of horses using alfalfa cubes.1|
|Mature Horses at Maintenance 500 kg or 1100 lb body weight|
|Alfalfa Cubes||17 -18 lb per horse per day|
|Trace Mineral Salt||Free Choice|
|Broodmare in the 10th Month of Gestation 500 kg or 1100 lb body weight|
|Alfalfa Cubes||15 lb per horse per day|
|Concentrate Mix2||4 lb per horse per day|
|Mature Horse at Light Work3 500 kg or 1100 lb body weight|
|Alfalfa Cubes||15 - 16 lb per horse per day|
|Concentrate Mix4||4.5 lb per horse per day|
|6-Month-Old Weanling Expected mature size 500 kg or 1100 lb. Current body weight 550 lb and growing at a rate of 1.25 lb per day|
|Alfalfa Cubes||8 - 9 lb per horse per day|
|Foal Concentrate Mix5||5 lb per horse per day|
|1The feeding suggestions provided are to be used as guidelines for feeding alfalfa cubes. Horse owners should monitor the body condition of their horses and adjust the rations accordingly.|
2The concentrate in the example is a commercial grain ration with a minimum of 10% crude protein, 0.75% calcium, 0.55% phosphorus, and 2000 IU/lb of vitamin A.
3Light work is considered to be activities such as Western and English Pleasure or Equitation riding.
4Horse owners can select a grain mixture that has a minimum of 10% crude protein and a crude fiber level not greater than 10%.
5Horse owners should use a commercial feed designed for foals. The foal ration in this example has the following levels: crude protein, 16%; calcium, 0.80%; phosphorus, 0.75%; and vitamin A, 5000 IU/lb. If a greater rate of growth is required, the level of concentrate should be increased and the daily intake of cubes decreased.
The incidence of wood chewing has been reported to increase with horses fed processed feeds. Researchers investigated the incidence of wood chewing in mature horses fed either long-stem alfalfa hay or alfalfa cubes. The horses were fed forage at 2.5% of their body weight. There was no effect of diet on the incidence of wood chewing. It appears that other factors such as boredom or weather may be responsible for horses developing the habit of chewing wood.
Alfalfa cubes can be used effectively as the sole source of roughage for all classes of horses. Because of the high nutrient values for energy, protein, calcium, and vitamins, alfalfa cubes are very effective in feeding programs for broodmares and young growing horses. In addition, alfalfa cubes may be used for horses with certain respiratory problems as horse owners try to reduce the horses' exposure to dust and mold. With all horses, and especially the mature horse at maintenance, controlling the daily intake of alfalfa cubes is a must to prevent overfeeding.