Buying Winter Hay for Horses

Hay is an extremely important part of your horses winter diet. It is an important source of calories and the internal heat of fiber fermentation helps to keep your horse warm when its cold outside.
In the fall many of us are starting to think about stocking up on hay for the winter. There are many factors that will influence your purchase.
Hay market. When weather conditions are not ideal for making hay high quality hay can be in tight supply and high in cost. However by tracking good quality hay prices at hay auctions over 3 full years 20162018 USDA PA Weekly Hay Report discontinued in May 2019 it appears that yearly hay prices at auction have been lowest from June to September before increasing in October. Private sale prices may not vary as much month to month as auction prices but they will follow the same general trends.

Storage. How much space do you have to store your hay? While it would be nice to stock up on all the hay you will need for the winter you need to consider how much will fit in your available storage space.
Bale type. Most horse owners buy small square bales for ease of handling. However you can save money if you have the capability to handle and store larger bales. According to the USDA PA Weekly Hay Reports buying good quality grass hay in large square bales would save an average of 50 per ton. Another way of looking at it is that in the PA hay auctions buying small square bales was 28 more expensive.
Nutritional needs. Not all horses need premium quality hay with very high protein and energy levels. While we certainly want our hay to be high quality in terms of minimal weeds dust and other contaminants mature hay with

lower nutritional value can be safe and healthy for obese horses or easy keepers. For these horses it is better to feed more of a lower calorie hay than to restrict intake of a premium quality hay. Hay forage should be the foundation of a horses ration and they should have access to forage as often as possible for gut health and normal feeding behavior. Remember there is only way to know for sure what the nutritional quality of the hay is analyzing a sample of each load.
Fiber for warmth. It is advisable to purchase a bit extra for extremely cold periods. Fiber is fermented in the horses cecum which produces heat and helps to keep the horse warm. Horses with heavy winter coats that are acclimated to the climate need extra forage for warmth when the temperature drops below 18F. Clipped horses will need extra hay at warmer temperatures. An extra flake from a small square bale per horse should be plenty.
Hay Waste
Before calculating the amount of hay you will need to purchase you should also consider how much of your hay gets wasted either from storage or by your horses. Storage waste can range from 240 depending on how you store the bales. Round bales stored outside produce the most waste as the bottom and outermost 4 layer will be exposed to moisture. Storing hay inside or covering it well can reduce the amount wasted.
Then you must consider the amount wasted by your horses as they eat. Feeding hay on the ground is a huge source of waste as horses trample and defecate on it. Studies at the University of Minnesota have found that using feeders significantly reduces hay waste. When feeding small square bales the study found the following amounts of hay waste
No feeder 13
Hay rack 5
Basket feeder 3
Slat