People combat cold weather by putting on additional clothing; horses fight the elements by using more energy to maintain body temperature. But while most people can address their own needs, horses are dependent upon their owners to provide proper nutrition and protection from the weather
The temperature below which a particular horse starts to expend additional energy for maintaining body warmth (critical temperature) will vary because of fat cover, hair thickness, acclimatization of the horse to cold, hair-coat wetness and wind chill. For example, a horse with short hair, exposed to wet, cold weather, may need significantly more energy when the temperature gets below 50 degrees Fahrenheit. A horse acclimatized to cold weather, with a thick hair coat and fat cover, may not expend appreciably more energy until the temperature drops below 30 degrees Fahrenheit. As a general rule, a 1 percent increase in the energy requirements is needed to replace energy loss from the cold weather for each degree the temperature falls below the horse’s thermo-neutral zone (lower critical temperature).
In other words, a horse manager would have to supply roughly two pounds more feed for each 10 degrees Fahrenheit below the critical temperature per day when horses are consuming typical hay and grain rations, a situation that is not practical. That’s why horses need to be preconditioned for cold weather by increasing fat thickness and body condition before the onset of winter. Sudden changes in grain composition and amounts will increase the incidence of colic and founder. It’s best to make adjustments in grain gradually over a period of several days, especially if horses already are consuming large quantities of grain. Horse managers also should consider feeding large amounts of grass hay to horses restricted from forage. Free-choice hay helps horses exposed to cold weather, partly because of the heat generated by digestion and also as an aid to a continual, safe supply of nutrients.
A concern with providing free access to hay is maintaining a fresh hay supply in ways which reduce hay waste. Large hay losses usually occur when round bales are placed on the ground in pens of horses.
Those who have elevated hay feeders large enough to hold round-bales need to use them. No matter the method, hay exposed to wet weather for any length of time generally will require removal because of decreased palatability and potential problems resulting from horses ingesting moldy hay.
PROVIDE SHELTER
Another way horse owners can lessen an equine’s stress resulting from exposure to cold weather is to provide some form of shelter from wind, rain and cold. Some pastures provide enough natural protection that man-made shelters are not required.
Owners housing horses in areas unprotected from wet, windy weather should consider constructing windbreaks or sheds. The cost of windbreaks and sheds will be partially offset by savings in feed costs as a horse’s energy requirements lessen. They remind owners to consider horse instincts and herd pecking orders when deciding on windbreak or shed design. Those areas housing one or two horses that are compatible with one another will allow for an enclosed shed with three or four sides. These structures should be similar in size to recommendations for stalls, a 10-feet- by-10-feet minimum for one horse. The same type of structure will not work in pens with large numbers of horses or bands of horses with large ranges in horse dominance orders.
An enclosed, sided structure may increase horse injury to horses on the low end of the herd dominance order by the more dominant horses. This type of structure may be inefficient because dominant horses will keep others from having access. They recommend single-sided windbreaks with a top cover be used in herds with dominance problems. Also, owners should consider two or three of these structures spread about the area because one long, continuous structure is easily guarded by dominant horses. Structure dimensions will depend on the degree of herd dominance problems. In situations where aggressive behavior becomes such a problem that horses need to be separated, horses on the low end of the herd order generally will need more shelter because they are the ones that are usually in the least favorable body condition.
USING HEATED BARNS
Horse owners who use heated barns to keep water from freezing and to protect horses from cold temperatures during winter should remember supplemental heat can cause problems if used incorrectly. Ventilation is important when horses are kept inside a barn. Closing up a barn to maintain heat may increase respiratory diseases because of high ammonia content and bacterial growth in stalls. Closed barns usually have increased humidity. High humidity combined with warm temperature can cause enough nitrogen smell or bacteria growth to irritate the horse’s respiratory system. These frequently result in chronic, minor respiratory problems that interfere with animal performance. A controlled research was done to define acceptable humidity and temperature levels to lessen the chance of respiratory illnesses is difficult because of the variability between barns, the horse’s daily routines in and out of the barn and lack of controlling research conditions. However, many veterinarians attest to an increase in respiratory problems in heated barns with high humidity.
TURN DOWN THE HEAT
The solution is to turn down the heat and get rid of the humidity by increasing air flow. Some farm operators have reported beneficial results by installing exhaust fans that move air when the humidity rises. There are methods to make these systems automatic by installing rheostats that respond to humidity levels. Another problem is that while the ideal temperature for horses is around 45 degrees to 65 degrees Fahrenheit, this “ideal range” may be neither cost effective nor a way to promote equine health. Increasing the heat of a barn above 55 degrees Fahrenheit not only can be expensive, but it also may have negative effects when moving horses out of the barn into colder temperatures.
Equine managers also need to remember that horses under artificial lighting programs for reproductive or show reasons will shed hair. Therefore, special considerations must be given to protect these animals from cold, windy and wet weather. Even though hair growth is largely a photoperiodic response, warm environments assist in keeping hair short. Adequate hair cover is extremely important during cold conditions, providing the horse with needed insulation to combat the cold stress of near freezing or freezing temperatures. Frequent movement into and out of heated barns from cold outside environments may in itself be a significant source of stress that can be avoided. Freeman said one alternative is to maintain barn temperatures at around 45 degrees to 55 degrees Fahrenheit and use blankets to keep horses with short hair coats protected from cold temperatures in and outside of the barn.
Part of the problem with maintaining proper barn temperature is that people working in the barn often like it a bit warmer than is recommended for the horses. Horse managers should maintain barn temperatures at a level that will help promote healthy horses and not at a level dictated by a worker’s personal comfort. This might require periodic checks by the barn manager to ensure temperatures are set at the proper level. It’s often just a case of human nature. If you’re cold, you don’t think twice about turning up the heat a bit. But that oversight can cause health-related problems for horses, which in turn can mean money lost to the horse owner.
