Evaluating the quality of feed fats and oils and their effects on pig growth performance.

摘要: Feed fats and oils provide significant amounts of energy to swine diets, but there is large variation in composition, quality, feeding value, price among sources. Common measures lipid quality include moisture, insolubles, unsaponifiables (MIU), titer, free fatty acid content, limited information regarding their value. Lipid peroxidation an important factor related animal growth performance health, maximum tolerable limits various lipids have not been established. Several indicative assays can be used detect the presence compounds, due complexity numerous compounds produced degraded during process, no single method adequately determine extent peroxidation. Until further available, using a combination peroxide thiobarbituric reactive substances (TBARS), anisidine value appear reasonable assessment at cost. However, composition being evaluated should considered when selecting specific assays. Predictive tests also estimate stability or susceptibility active oxygen method, oil index, bomb method. A review 16 published studies with pigs has shown average decrease 11.4% rate, 8.8% feed intake fed isocaloric diets containing peroxidized compared unperoxidized same source. Furthermore, serum vitamin E content was generally reduced TBARS increased were these studies, suggesting that negatively affects metabolic oxidative status pigs. it unclear if antioxidants are useful additions maintain optimal nutritional addition beneficial overcoming challenge.