302 THE INDIAN JOURNAL OF VETERINARY SCIENCE AND ANIMAL HUSBANDRY [ IV, IV.

                                                TABLE III.

                                      Nitrogen balance per day.

Date

Animal
No.

In paddy
straw
ingested

Voided
in
faeces

Digested

Voided
in
urine

Balance

Loss or gain
in Live
weights per
day

1

2

3

4

5

6

7

8

19th to 28th
May 1932.

D7

gm.

gm.

gm.

gm.

gm.

lbs.

14.271

13.434

+0.837

7.040

—6.203

—0.9

18th to 27th
July 1932.

D7

11.649

15.533

—3.884

5.706

—9.590

—2.7

12th to 21st
June 1932.

D8

11.915

12.358

—0.443

5.861

—6.304

—1.0

18th to 27th
July 1932.

D8

10.423

14.162

—3.739

4.536

—8.275

—2.3

10th to 19th
August 1932.

R1

12.924

13.857

—0.933

5.444

—6.377

—1.0

10th to 19th
August 1932

R2

13.181

14.197

—1.016

5.150

—6.166

—0.7

The Need of Balanced Ration. In such circumstance the addition of a concentrate
becomes a necessity in order that the experiment can be conducted under more
normal conditions where the animals could have at least a balanced ration. But
with a mixed ration (here one roughage and one concentrate) the necessity arises
to assume that the digestibility of one of the feeds is known and constant, so that
by corresponding elemination we may calculate the digestibility of the other. Since
however such digestibility figures for India are not available, we had to rely on
" known " published data of elsewhere (European or American) and thereby, making
the corresponding deduction, assign the digestibilities of the roughage.

                                         EXPERIMENTAL SCHEME.

Our investigation naturally included this part of the trial (viz., calculation by
assumed values) and in order to combine in the same the other objectives now