Although there are some standards,[1,2] considerable variations exist in the classification and quality of animal fats and fish oils. Similarly, other animal and marine byproducts are generally more variable than plant feeds in terms of their nutrient content and quality because of the source of raw materials and heat processing used for dehydration and sterilization. The composition of selected animal by-product feeds is presented in Tables 1 and 2. For complete information, readers are referred to the National Research Council (NRC)[4-7] and other[1-3,8-11] publications. Since the first diagnosis in the mid-1980s, there has been some impact of bovine spongiform encephalopathy (BSE) on the food animal industries in many countries. In light of BSE, regulations on the use of some animal by-products may differ depending on the country, species, and/or product, and they are subject to change. For complete information on this issue, readers are referred to, among others, the United Nations Food and Agriculture Organization (FAO) Web site.
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