This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1908 Excerpt: ...any period of heavy feeding will cause a fattening whether the animal be young or mature. « Feeds and Feeding, second edition, p. 374. For our present purpose it will be convenient to use the term fattening more nearly in its commercial sense as denoting heavy feeding, whether of mature or immature animals, for the production of marketable carcasses. COMPOSITION OF INCREASE. The amount of protein gained, as has been shown, is largely dependent upon the age and to a less degree upon the individuality of the animal, although probably affected to some extent by the supply of feed protein. The fat formation, on the other hand, is primarily dependent, in a broad general way at least, upon the total feed supply. Accordingly, we should anticipate that the composition of the increase would vary with the age of the animal, consisting more and more largely of fat with increasing maturity. Proportion of protein and fat.--From this point of view the nature of the increase is best characterized by the ratio of protein to fat--that is, by the composition of the water-free and ash-free gain, leaving for later consideration the actual composition of the total gain in live weight. It seems desirable also to distinguish, so far as possible, between the gain of protein in the form of lean meat or of the soft tissues and that in the form of epidermal tissues (hair, feathers, hoofs, horns, etc.), although as a matter of fact the proportion in the latter is relatively slight except in a few experiments with geese. The following tabulation contains the results of the experiments accessible to the writer which afford more or less complete data as to the composition of the increase. Those on growing animals are arranged roughly according to age. Proportion of protein and fat i...
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