This comprehensive and detailed symposium covers all aspects of the use of synthetic urea to supplement dietary protein for animals. The work is largely concerned with the feeding of urea to ruminant livestock, but studies on the inclusion of urea in the diet of infants, pigs and poultry are also reported in separate chapters. The work is divided into 4 parts, comprising 23 chapters: I, history, manufacture and rôle of urea in world food problems; II, effects of urea on ruminant physiology; III, urea as a supplement for ruminants; IV, urea in diets for non-ruminants. References to the literature are given at the end of each chapter. Of particular dairying interest are chapters 10 (pp. 185-212), 'The production of milk on protein-free rations', and 13 (pp. 239-74), 'Urea in rations for dairy cows'. An appendix dealing with methods for the estimation of urea in food and an index complete the work. NdeV.
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