Document Detail

Labile nitrogen reserves in the ruminant. Metabolic changes in growing cattle employing a nitrogen depletion-repletion treatment.
MedLine Citation:
PMID:  1195019     Owner:  NLM     Status:  MEDLINE    
A metabolism study was conducted in which eight growing steers were subjected to a nitrogen (N) depletion-repletion regime. Three consecutive time periods were used to standardize, to deplete, and to replete body N. Diets fed in the respective periods provided by analysis 6 and 16% protein equivalent, respectively, from corn gluten or urea. Metabolic parameters were monitored during weeks 3 and 5 of standardization, weeks 1, 3, and 5 of depletion, and weeks 1 through 7 of repletion. Growth-rate trends started to deviate downward from linearity during the last 2 weeks of depletion; a trend that was not reversed until week 3 of repletion. Apparently digested N was defined by regression equations in which truly digested N was 94 and 83% of ingested N and metabolic fecal N totaled 0.64 and 0.48 g N/100 g ingested dry matter for corn gluten and urea N, respectively. The relationship between total urinary N losses and truly digested N was determined in which biological value equaled 60 and endogenous urinary N losses totaled 0.34 g N/kg0.60/day (equivalent to 0.040 g N/kg/day). Retained N decreased from 1.09 g during standardization to 0.16 g/kg0.60/day after 1 week of depletion. A subsequent improvement in retained N to 0.36 g in week 3 was followed by a decrease to 0.19 g/kg0.60/day after week 5 of depletion. In repletion, lowest and highest retained N occurred during weeks 1 and 4. Changes in retained N were produced by changes in urinary urea N excretion. Ammonia N accounted for 20, 21, and 24% of the total urinary N voided during standardization, depletion, and repletion. Except for urinary urea N losses that were greater and inversely related to fecal losses in urea-fed steers, dietary N source did not influence the excretion of ammonia, creatinine, or residual N.
G N Biddle; J L Evans; J R Trout
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Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  The Journal of nutrition     Volume:  105     ISSN:  0022-3166     ISO Abbreviation:  J. Nutr.     Publication Date:  1975 Dec 
Date Detail:
Created Date:  1976-02-19     Completed Date:  1976-02-19     Revised Date:  2008-11-21    
Medline Journal Info:
Nlm Unique ID:  0404243     Medline TA:  J Nutr     Country:  UNITED STATES    
Other Details:
Languages:  eng     Pagination:  1578-83     Citation Subset:  IM    
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MeSH Terms
Ammonia / urine
Body Weight
Cattle / metabolism*
Creatinine / urine
Deficiency Diseases / diet therapy
Dietary Proteins / administration & dosage
Energy Metabolism
Glutens / administration & dosage
Nitrogen* / deficiency,  metabolism
Urea / administration & dosage,  urine
Zea mays
Reg. No./Substance:
0/Dietary Proteins; 57-13-6/Urea; 60-27-5/Creatinine; 7664-41-7/Ammonia; 7727-37-9/Nitrogen; 8002-80-0/Glutens

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine

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