In which part of a pig's body does absorption primarily occur?

Absorption in a pig primarily occurs in the small intestine, which is a crucial area for digestion and nutrient uptake. The small intestine is composed of three sections: the duodenum, jejunum, and ileum. Each of these sections plays a role in breaking down food and absorbing essential nutrients, such as amino acids, fatty acids, vitamins, and minerals. The inner lining of the small intestine is covered with villi and microvilli, which increase the surface area and enhance the absorption process.

In comparison, while the stomach is involved in the initial stages of digestion, it does not significantly contribute to nutrient absorption. The colon and large intestine are mainly responsible for water absorption and the formation of feces; they do not play a primary role in nutrient absorption as the small intestine does. Thus, the small intestine is recognized as the primary site for absorption in pigs and many other animals.