1. There are six basic classes of nutrients that must be considered in formulating diets:water、carbohydrates、protein、lipids、minerals、vitamins.2. Maintenance is the state in which there is neither gain nor loss of a nutrient by the body.3. Pigs are delivered in the “litter”,and chicks are hatched from the “egg”.4. After approximately 115 days of pregnancy,parturition is initiated.5. Regardless of the species ,most of digestion and absorption of nutrients take place in the small intestine.
