Which organ secretes bile into the small intestine in horses?

The liver is the correct answer because it is the primary organ responsible for producing and secreting bile, which is essential for the digestion and absorption of fats in the small intestine of horses. Bile aids in emulsifying fats, making them more accessible for digestion by enzymes. While the gallbladder stores bile produced by the liver, it is the liver itself that synthesizes and secretes bile.

Other options like the stomach and pancreas contribute to digestion but do not produce bile. The stomach is primarily involved in breaking down food with gastric juices, while the pancreas secretes digestive enzymes and bicarbonate to aid in digestion, particularly in the small intestine, but does not produce bile. The gallbladder, although involved in the digestive process, does not secrete bile; its role is mainly to store and concentrate bile until it is needed in the small intestine.