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The use of the excretion of nitrogen compounds as an indirect index of the adequacy of dietary protein in chickens

Published online by Cambridge University Press:  02 September 2010

I. Fernández Fígares ,
R. Nieto ,
J. F. Aguilera  and
C. Prieto
I. Fernández Fígares
Affiliation:
Estación Experimental del Zaidin (CSIC), Animal Nutrition Department, Profesor Albareda 1, 18008 Granada, Spain
R. Nieto
Affiliation:
Estación Experimental del Zaidin (CSIC), Animal Nutrition Department, Profesor Albareda 1, 18008 Granada, Spain
J. F. Aguilera
Affiliation:
Estación Experimental del Zaidin (CSIC), Animal Nutrition Department, Profesor Albareda 1, 18008 Granada, Spain
C. Prieto
Affiliation:
Estación Experimental del Zaidin (CSIC), Animal Nutrition Department, Profesor Albareda 1, 18008 Granada, Spain
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Abstract

An experiment was carried out to study the effect of changes in either the quality or the quantity of dietary protein intake on the excretion of nitrogen (N) compounds in the chicken. Thirty-two White Rock male broilers (1 day old) were raised in batteries and fed a commercial starter diet for 9 days. Then they were randomly divided into eight groups each of four birds, of similar body weight (mean live weight: 178 (s.e. 1·9) g), and individually housed in metabolism cages. Following a paired-feeding design based on metabolic body weight (kg M0·75), each group of birds was given, for an experimental period of20 days, each of four levels of protein (60, 120, 180 or 240 g/kg: 5 days each) in two groups of isoenergetic (14·5 kj metabolizable energy per g dry matter) and semisynthetic diets based on soya-bean meal, known to be first limiting in methionine, either unsupplemented (diets S) or supplemented with 2 g/kg DL-methionine (diets SM). Excreta were collected every 3 days for 48 h, frozen and stored at −20°C. The excreta samples were subjected to chemical analysis for uric acid by a rapid high-performance liquid chromatographic method, for urea and ammonia by a colorimetric method, and for total N by the Kjeldahl procedure. In general, the excretion of major N compounds was markedly affected by either the quality or the content of dietary protein. Overall, the excretion of total N, uric acid-N, ammonia-N and urea-N significantly (P < 0·05) decreased with improvement in dietary protein quality and significantly (P < 0·05) increased with increase in protein intake. Regression equations were obtained relating the excretion of uric acid, urea, ammonia and total N on protein supply. For the partition ofN compounds output, the ratios of uric acid-N and ammonia-N to total N significantly (P < 0·05) decreased on improving dietary protein quality and increased or remained unchanged, respectively, with the increase in dietary protein content. The use of the ratio of ammonia-N to total N is recommended as a rapid, easy and accurate indicator of dietary protein adequacy, as an alternative to measures based on total N balance, without the need for separation of urine and faeces.

Keywords

excretionfowlsnitrogen balanceprotein intakeprotein quality
Type
Research Article
Information
Animal Science , Volume 63 , Issue 2 , October 1996 , pp. 307 - 314
Copyright
Copyright © British Society of Animal Science 1996

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