144 THE INDIAN JOURNAL OF VETERINARY SCIENCE AND ANIMAL HUSBANDRY [ II, II

almost half, but the fibre showed a higher digestibility coefficient. The daily
nitrogen balance of 0.14 to 2.01 grammes as against 6.35 to 13.33 for Ferozepur
hay showed it to be a maintenance ration. The fact must not be lost sight of that
different animals vary to some extent in their powers of consumption and assimila-
tion, e.g., the Ferozepur and Jhelum hays were tried on the same animals, namely,
heifers Nos. 122, 128 and 133, but while heifer No. 122 ate the greatest quantity of
Jhelum hay, the digestibility coefficients were almost parallel with those obtained
with the other two animals. A daily nitrogen retention, however, of 2.01 grammes,
in the case of No. 122 compares favourably with the figures for the other two
animals showing a daily nitrogen retention of 0.14 and 0.33 grammes respectively.

Kasauli Hay. (Heifers 123, 124, 129) 15th January 1929— 28th February
1929.

Reference to the negative daily nitrogen balances in Table IV shows this hay
to the below maintenance standard. On the basis of previous experience with a
similar hay from Rawalpindi [Lander and Lal Chand Dharmani, 1929], 3 lbs., 2 lbs.,
and 1 lb. of wheat bran respectively were added to the rations of heifers Nos. 123,
124 and 129 in order to effect a maintenance ration. Rawalpindi and Kasauli hays
appeared from the data obtained to be roughages of similar type from the point of
view of chemical composition, mineral content and digestibility coefficient figures.
We found that 1 lb. of added bran could repair nitrogen deficiency to the extent of
7.92 grammes per day in our trials with Rawalpindi hay on cows of similar de-
scription. Consequently 3 lbs. of bran might be expected to effect an addition of
23.76 grammes of nitrogen for retention in the animal economy per day. We
found, however, with the Kasuali hay that 3 lbs. of added bran fed per day to
heifer No. 123 gave us a positive nitrogen balance of 10.15 grammes equivalent
therefore to an addition of 16.47 grammes nitrogen per day or 5.49 grammes
nitrogen per lb. of bran fed. Similarly the addition of 2 lbs. of bran in the ration
of heifer 124 effected an addition of 8.31 grammes nitrogen per day, or 4.16
grammes per lb. of bran fed. Again an addition of 1 lb. bran to the hay ration of
heifer 129 effected an addition of 5.03 grammes nitrogen per day. These figures
are of interest in comparison with Rawalpindi hay where 1 lb. of added bran
repaired a nitrogen deficiency of 7.92 grammes per day, if we keep in mind the fact
that the bran used with Kasuah hay was only 72 per cent. as rich in protein as that
used with the earlier Rawalpindi hay trials [Lander and Lal Chand Dharmani,
1929].

The figures showing the efficiency of added bran to the hay ration of these
three cows are almost similar. On the basis of the above data No. 123 which was
losing 6.32 grammes nitrogen daily should have had 1.2 lbs. of bran and heifers