Growth and development with special references to domestic animals XV: Energy and nitrogen metabolism during the first year of postnatal life
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Numerical data are presented on the energy metabolism of farm animals (dairy cattle, beef cattle, horses, sheep, and swine) during the first year of postnatal life. Some data are also presented for chickens and rats. The bulk of the data were obtained on normally-fed animals about 12 hours after feeding; but some of the measurements were made on low-fed, high-fed, and fasting animals. Some data, in graphic form only, are presented for the elimination of urinary nitrogen in its several forms (total, urea plus ammonia, creatinine, and creatine) in dairy calves. The age changes in consumption of feed (hay, grain, milk, dry matter, crude protein, net energy) are given for the dairy calves, as also their age changes in linear size. Similar data are presented for the colts. A rather extensive list of references is given. Tentative interpretations of the results are formulated in the text. A somewhat lengthy historical review is also included.