RESEARCH NOTE
THE TERMINOLOGY AND PRESENTATION OF ANIMAL NUTRITION
DATA ON A COORDINATED PROCEDURE
[This note was prepared by a specialist committee consisting of DR P. E. LANDER, Mr I. B. CHATTERJEE
and DR K. C. SEN and contains information collected from various publications—Editor]
NON-MINERAL DATA
I. The Energy value of a feed
This should be expressed both as starch equi-
valents (S. E.) as well as total digestible nutrients
(T. D. N.).
(a) The calculation of S. E. for roughages
The conversion factors for each type of digestible
nutrients are as follows :—
Total protein
.
.
.
.
.
Total carbohydrates
.
.
.
.
Ether extract .
.
.
.
.
.
0.94
1.0
1.91
After multiplying each kind of the nutrient by
the proper conversion factor, add the figures.
From the resulting value, deduct the follow-
ing :—
If the material contains 4 per cent and less crude fibre,
0.29 for every per cent of actual crude fibre.
If the material contains 5 per cent and less crude fibre,
0.31 for every per cent of actual crude fibre.
If the material contains 6 per cent and less crude fibre,
0.34 for every per cent of actual crude fibre.
If the material contains 7 per cent and less crude fibre,
0.36 for every per cent of actual crude fibre.
If the material contains 8 per cent and less crude fibre,
0.38 for every per cent of actual crude fibre.
If the material contains 9 per cent and less crude fibre,
0.40 for every per cent of actual crude fibre.
If the material contains 10 per cent and less crude fibre,
0.43 for every per cent of actual crude fibre.
If the material contains 11 per cent and less crude fibre,
0.45 for every per cent of actual crude fibre.
If the material contains 12 per cent and less crude fibre,
0.48 for every per cent of actual crude fibre.
If the material contains 13 per cent and less crude fibre,
0.50 for every per cent of actual crude fibre.
If the material contains 14 per cent and less crude fibre,
0.53 for every per cent of actual crude fibre.
If the material contains 15 per cent and less crude fibre,
0.55 for every per cent of actual crude fibre.
If the material contains 16 per cent or more crude fibre,
0.58 for every per cent of actual crude fibre.
The value obtained after this deduction is the
S. E. of the roughage.
(b) The calculation of S. E. of grains and other con-
centrates
The conversion factors for each type of digestible
nutrients:—
Total protein . . . .
Total carbohydrates
.
.
.
.
Ether extract from cereal grains and bye-
products
.
.
.
.
.
.
Ether extract from oilseeds and oilcakes .
0.94
1.00
2.12
2.41
After multiplying each kind of the nutrient by
the proper conversion factor, add the figures. The
result is then multiplied V/100, where V is the value
number given in Kellner's book for the particular
feed. The final figure is the S. E.
(c) The calculation of total digestible nutrient
The digestible ether extract is multiplied by 2.25
which is then added to the sum of digestible crude
protein and digestible total carbohydrates to give
the value of T. D. N.
(d) No arbitrary increase in S. E. value of Indian
feeding stuffs should be made at present.
II. Protein value of a feed
This should be expressed as digestible crude
protein (D. C. P.) as well as protein equivalent.
The protein equivalent should be calculated by the
formula
P. E.=D. T. P. + D. C. P.—D.T.P/2
where D. T. P.=digestible true protein.
III. The maintenance requirement for T. D. N.,
D. C. P. and P. E. should be calculated on the
basis of body surface.
The formula is as.
follows :—
S=KW 0.73
where S is surface in sq. metres, K is constant,
the value of which is 0.053 for cattle, and W is
body-weight in pounds.
The requirement values should, however, be
tabulated according to body weight which will faci-
litate their use in practical rationing.
IV. No recommendation is made regarding the
adoption of expressions like 'straw equivalent'
or 'hay equivalent.'
MINERAL DATA
1. The values for different minerals should be
expressed as elements. But during the transition
period, the data may also be given as oxides.
2. The mineral requirement should be given in
terms of body weight.
3. In the specific studies of acid-base balance, it
will be useful if the extent of electro-neutrality of
feeds can be shown.
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