The respiratory system of the horse is well adapted to athletic exercise, with unrestricted upper airway diameters, and a large lung capacity afforded by 18 ribs. These combine to enable air intakes of up to 1800 litres per minute in a galloping horse. Volumes of up to 300 litres of blood are pumped at high pressure through small lung capillaries surrounding 10 million air sacs to take up and deliver over 70 litres of oxygen per minute to the working …showed first 75 words of 662 total…

…showed last 75 words of 662 total…in the feces. Overfeeding protein will increase the excretion of nitrogen. Overfeeding phosphorus will increase the excretion of phosphorous, most of which is excreted in the feces. Horses should be fed a diet that is digestible and formulated to meet nutritional requirements, while avoiding excesses. Overfeeding can result in higher levels of nitrogen and phosphorus in the manure. Horse farmers should feed horses according to their nutritional needs. Specific recommendations for nitrogen (protein) and phosphores.