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close this bookProtein-Energy Requirements of Developing Countries: Evaluation of New Data (UNU, 1981, 268 pages)
close this folderObligatory and integumental nitrogen losses - children
close this folderObligatory nitrogen losses and factorial calculations of protein requirements of pre-school children
View the document(introductory text...)
View the documentObjectives
View the documentExperimental details
View the documentSummary of the main results
View the documentConclusions

Conclusions

1. The obligatory faecal and urinary nitrogen excretion on a protein-free, low-residue diet can be assessed during the last two of six experimental days.

2. Urinary and faecal nitrogen are 34 ± 5 and 20 ± 7 mg N/kg/day, respectively.

Child

Days on a nitrogen - free diet

 

1

2

3

4

5

6

7

8

9

Urinary nitrogen

58.9

28,9

41.0

37 4

25 5

33.6

27,4

31.3

44.2

C.R.

58.9

28.9

41.0

37.4

25,5

33.6

27,4

31,3

30 2

W.M.

81.3

52.4

29.8

39.0

31.2

33.4

35.2

34.0

30.2

I.G.

85.4

39.0

37.1

33.6

31.1

39.8

34.3

39.4

33.3

H.A.

89.4

68.6

60.8

43.4

40.8

38.4

39.8

31.1

40.3

A.A.

-

58.2

36.9

39.9

22.8

.5.5

29.2

-

-

Mean

78.8

49.4

41.1

38.6

30.2

36.1

33.2

33.9

37.0

S.D.

11.8

15.8

11.8

3.6

6.9

2.8

4.9

3.4

6.0

Faecal nitrogen  
C R.a  

19.8

 

26,3

 

27,9

 

28.2

 
W.M. a,b  

19.0

 

23.1

 

20.1

 

13,9

 
I.G.  

9.7

 

7.4

 

15.2

 

9.7

 
H.A.  

29.7

 

12.1

 

27.2

 

22.1

 
A.A.  

12.9

 

22.0

 

17.9

 

-

 
Mean  

18.2

 

18.1

 

21.6

 

18.5

 
S.D.  

7.7

 

8.0

 

5.7

 

8.3

 
Total (urinary + faecal nitrogen)  
Mean -  

67.6

59.3

56.7

48.4

57.7

54.8

52.4

55.5

S.D. -  

20.5

18.4

9.4

6.8

5.8

7.3

5.2

14.4

a Giardia lamblia in stools.
b Trichuris trichiura in stools. Both parasites diagnosed in faecal specimens collected four to nine weeks before the study.



FIG. 1. Urinary and Faecal Nitrogen Excretion on a Nitrogen-Free Diet

3. The mild parasitic infestations in two of the five children did not increase faecal nitrogen.

4. Factorial calculations using the empirical correction factor of 30 per cent support the conclusions of our studies with milk protein.