Concentrates are feeds that contain a high density of nutrients, usually low in crude fibre content (less than 18% of dry matter (DM)) and high in total digestible nutrients). Concentrates may be high in protein, with over 20% crude protein, referred to as protein concentrates. The primary role of concentrate feeds is to provide concentrated sources of necessary nutrients for livestock production. These nutrients include not only macro-nutrients of energy and protein but also important specific nutrients such as amino acids, fatty acids, enzymes, vitamins, minerals and others. That is why, all answers are correct, except for (2) cellulose
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