Protein, fat, and minerals are concentrated in skeletal muscle, adipose tissue, and bone, respectively. However, all tissues, including the adipose tissue and bone, contain protein and all tissues contain minerals and fat. The proportion of the whole represented by muscle, fat, and bone changes as animals grow.[6,7] The bone and muscle masses increase until the animal reaches the adult body size, whereas the fat mass continues to grow as long as the animal is fed a balanced diet containing more energy than necessary to achieve maintenance (Table 1).
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