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It has been known for almost a century that ruminant animals have the unique ability to convert nonprotein nitrogen (NPN) to protein. Becker (11) reviewed the early use of NPN compounds as protein replacers for ruminants. Weiske et al. ( Urea has been the most widely used NPN compound in ruminant rations. Reid (176) and Briggs (28) reviewed the literature on urea as a protein replacement for ruminants.
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Helmer et al. (1971) studied this question.
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