Figure 2 summarizes approaches that could be utilized to improve animal-derived foods. Among the traditional feeding and breeding methods, some are preharvest and some are postharvest techniques (Fig. 2). Preharvest techniques include feeding animals compounds such as vitamin E, omega-3 fatty acids, or CLA. Postharvest techniques available for modifying animal-derived foods include such procedures as calcium infusion or electro-stimulation of animal carcasses to improve tenderness, the addition of vitamin D to milk, which has been done for
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