BISC 101 : Animal Nutrition and Digestion

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Involves food (energy/nutrients) being taken in (ingested), taken apart (digested) and taken up (absorbed) y all animals must eat; food intake and demand or failure to eat properly= health problems. Essential nutrient examples y aas: methionine, valine, theonine, phenylalanine, leucine, isleucine, tryptophan, lysine y many vitamins (c, d) y unsaturated fas (18:2) y many minerals. 4 feeding mechanisms: substrate feeders live in or on their food source, fluid feeders suck nutrient-rich fluid from a living host, suspension feeders sift small food particles from water, bulk feeders ingest relative large particles of food. Four distinct stages: ingestion, digestion: mechanical/chemical digestion (enzymatic hydrolysis, absorption: nutrient molecules enter the body cells, elimination: unwanted material. Cows and microorganisms y rumen: first chews and swallows y reticulum: mutualistic prokaryotes and protists, regurgitation and rechewing of cud, further break down of fibers y omasum: reswallow of cud, water removal y abosmasum: digestion by cow s enzymes.

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