The stables have a serious pest problem due to the accumulation of feed and droppings. Imagine how your horse feels about them. These pest problems not only affect the health of horses, but also the health of people who live nearby.
Horses confined in stables are plagued by house fly, blow fly and stable fly. These flies breed in horse manure. Their ability to transmit the pathogens that cause diseases such as anthrax and equine infectious anemia to animals has been documented.
Mice consume and contaminate food destined for horse. A mature rat can eat up to 30 g of feed in a day. A colony of 100 rats can consume over a ton of feed in 1 year. This exceeds the amount of grain required to feed a 454 kg horse for a year. This amount does not include feed that has been spoiled by rodent urine, droppings and hair, which can be as much as 10 times the amount consumed if they have free access to the feed storage area.