Poultry Feeding: Principles and Practice (Classic Reprint) - Hardcover

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Excerpt from Poultry Feeding: Principles and Practice

At all times newly formed tissue is needed for replacement of the tissue destroyed by the general wear and tear of the body. Cells the small units of which the tissues of the body are composed), are constantly being worn out, broken down and sloughed off. These cells have to be replaced by material from the outside. During cer tain periods new tissue is needed also for growth and reproduction; that is, for the formation of new body material and reproductive cells.

The body also needs energy for the production of heat, which is necessary to maintain the body temperature and for all the body activities, including locomotion, blood circulation, respiration, diges tion, absorption and excretion. These activities are the distinguishing characteristics of what is called animal life, and all consume energy.

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