Table 2. Description of the environmental parameters considered in each farm.

Farm	Box stall	Paddock	Nutrition	Orientation	Miscellaneous
1	Wooden walls. Walls: concrete Bedding: straw. Cleanout: once a week.	Medium grain soil, uneven, with rocks and crevices. Mares are kept daily and return to box stalls at evening. Stallions are kept twice a week.	Grass hay. Concentrate: barley, amount based on the animal’s breeding condition.	Breeding.	Poor hoof care on most horses, no shoeing or regular hoof trimming.
2	Wooden walls. Walls: concrete Bedding: straw. Cleanout: daily bedding change.	Mixed sand with gravel, even. All horses kept daily, return to box stalls at evening.	Grass hay + alfalfa 2–3 times a week. Concentrate: barley, oats + 700 gr mixed flakes per day.	Breeding.
3	Concrete walls, single boxes for stallions and non-breeders; large box near the pasture for the mares. Floor: concrete. Bedding: dried shavings. Cleanout: daily.	Medium grain soil, uneven, with terracing and gravel in spots. Stallions and horses in training are kept daily, return to box stalls at evening. Mares do not return to stalls.	Grass hay + alfalfa hay twice a week. Mixed pasture. Concentrate: corn, barley, locust beans, oats, soy, mineral salts, at morning and evening, amount based on breeding condition.	Breeding. Trekking. Foal training. Endurance racing.
4	Concrete and wooden walls. Floor: concrete. Bedding: dried shavings. Cleanout: daily.	Medium grain soil, good leveling, sloping. Mares are kept daily and return to box stalls at evening. Stallions are kept for training 1 hour daily.	Mixed hay. Concentrate: at morning and evening.	Breeding. Endurance racing. Shows.	Good hoof care and shoeing.
5	Wooden walls. Floor: soil. Shelters near the paddocks. No bedding.	Medium grain soil, even, poor draining. All horses are kept daily.	Mixed hay, mostly alfalfa. Concentrate: foals and mares fodder, also used for stallions in winter; otherwise, 90% oats + 10% barley for stallions.	Breeding.
6	Walls: concrete and wood. Walls: concrete, stone and tuff. Bedding: shavings. Cleanout: daily.	Medium grain soil, leveled, on hillside. Mares kept daily. Daily hard ground training session for the show horses.	Grass hay. Concentrate: mixed flakes. Three meals a day for foaling mares and horses preparing for shows. Two meals a day for the others.	Breeding. Shows.
7	Solid concrete; concrete barn walls, wooden partitions, open shelters near the paddocks. Floor: stone, guttered for drainage.	Even clay soil. Horses kept daily, return to box stalls at evening.	Mixed hay with lots of alfalfa. Morning: carrots. About 1–1.5 kg mixed flakes per animal at morning and evening, based on breeding condition.	Breeding. Endurance racing. Trekking. Foal training.	Plastic shoeing on the front hooves.
8	Concrete and wooden walls. Floor: concrete.	Medium grain soil, even, poor draining. All horses are kept daily.	Mixed hay. Concentrate: at morning and evening.	Breeding