Urea and Other Nonprotein Nitrogen Compounds in Animal Nutrition (1976) / Chapter Skim
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CONSIDERATIONS ON THE USE OF NPN COMPOUNDS BY NONRUMINANT SPECIES
CONSIDERATIONS ON THE USE OF NPN COMPOUNDS BY NONRUMINANT SPECIES
Pages 88-94
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From page 88... ...
. The use of dietary protein to supply the required essential amino acids usually provides an adequate dietary supply of intact nonessential amino acids or nitrogen for nonessential amino acid synthesis.
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From page 89... ...
The utilization of various sources of NPN, including urea, diammonium citrate, and triammonium phosphate, has been demonstrated by several workers in chicks fed crystalline amino acid diets devoid of nonessential amino acids. The chick, however, lacks the ability to synthesize glycine and proline at a rate commensurate with the needs for rapid growth.
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From page 90... ...
(1966) reported that adding 2 or 3 percent protein equivalents of nitrogen from diammonium phosphate or diammonium citrate, respectively, to a 12.75 percent protein control diet containing adequate amounts of essential amino acids resulted in 4-5 percent increases in egg production.
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From page 91... ...
substituted 2 percent urea for herring meal on an isonitrogenous basis and noted depressed feed intake, daily gain, and feed conversion in pigs from 4 to 11 weeks of age when they were limit-fed, but not when they were fed ad libitum. Growing pigs that were fed a urea-containing diet from 11 weeks of age to 90 kg live weight gained less weight and required more feed per kg gain than nonurea fed controls.
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From page 92... ...
Efforts were made to replace 0, 5, 10, or 20 percent of the protein in a corn-soybean diet for growing swine with nonprotein nitrogen from an equimolar mixture of diammonium citrate and diammonium phosphate. With this experimental design, dietary essential amino acids as well as nonessential amino acids were being reduced.
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From page 93... ...
observed equal increases in nitrogen retention by mature ponies from isonitrogenous additions of either urea, soybean meal, or linseed meal when added to a low-protein basal diet. These workers concluded that equines can utilize urea to increase nitrogen retention when fed lowprotein diets, but that in general the efficiency of the utilization of the absorbed nitrogen from urea is considerably less than that of nitrogen from intact protein.
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From page 94... ...
Attempts to obtain satisfactory utilization of various sources of NPN by chicks fed diets containing natural feedstuffs have not been successful. More success has been obtained when urea, diammonium citrate, or triammonium phosphate were added to crystalline amino acid diets devoid of nonessential amino acids.
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