282
N. D. KEHAR AND R. CHANDA
TABLE VI
Nitrogen, calcium and phosphorus balance
Nitrogen intake—
Mango-seed kernel .
Rape cake . .
Wheat straw . .
TOTAL .
Nitrogen exeretion—
Faeces . ..
Urine . . .
TOTAL .
Nitrogen balance . .
Biological value of
the mixed protein.
Calcium intake—
Mango-seed kernel . .
Rape cake . .
Wheat straw . .
TOTAL .
Calcium excretion—
Faeces . . .
Urine . . .
TOTAL .
Calcium balance . .
Phosphorus intake —
Mango-seed kernel .
Rape cake . .
Wheat straw . .
TOTAL .
Phosphorus excretion—
Faeces . . .
Urine . .
TOTAL.
Phosphorus balance .
Animal
No. 1
22.26
23.65
14.10
60.01
26.29
10.10
36.39
+ 23.62
94.0
3.11
3.09
4.43
10.63
7.70
2.00
9.70
+ 0.93
4.88
4.72
1.93
11.53
10.15
0.06
10.21
+ 1.32
No. 2
15.97
17.74
10.81
44.52
19.32
14.50
33.82
+ 10.70
74.8
2.23
2.32
3.40
7.95
5.58
1.63
7.21
+0.74
3.50
3.58
1.48
8.56
7.44
0.04
7.48
+ 1.08
No. 5
20.03
23.65
12.93
56.61
21.48
17.10
38.58
+18.03
80.6
2.80
3.09
4.06
9.95
7.14
2.50
9.64
+ 0.31
4.39
4.72
1.77
10.88
9.10
0.05
9.15
+ 1.73
TABLE VII
Digestibility coefficient of mango-seed kernel*
Animal No.
1
2
5
Mean
Crude
protein
66.6
68.9
80.9
72.1
Ether
extract
51.3
58.1
59.4
56.3
Nitrogen-
free
extract
66.4
77.0
68.3
70.6
TABLE VIII
Digestible nutrients of mango-seed kernel as compared
with those of other grains and seeds
Barley . .
Maize . .
Oats . .
Corn* . .
Rye* . .
Oats* . .
Mango-seed
kernel
Digestible
protein
7.4
8.2
7.8
6.6
7.1
7.0
6.1
Starch
equivalent
84.6
93.3
73.4
..
67.5
Total
digestible
nutrients
86.0
94.3
78.5
74.2
87.0
72.2
70.0
*American figures
These observations put mango-seed kernel in the
category of the important concentrates for livestock
and make available about 70 million lb. of digestible
protein and 760 million lb. of starch equivalent per
year from a hitherto unutilized source of food. It
has been calculated that the digestible protein
obtained from 80 lb. of oats is equal to that obtained
from 100 lb. of mango-seed kernel and the starch
equivalent from 86 lb. Moreover, the keeping
quality of mango-seed kernels seems to be satis-
factory, as no deterioration has taken place after ten
months' storage.
Observations on rats
To investigate the possibility of human consump-
tion of mango-seed flour, experiments are in progress
on rats. Preliminary observations over a period of
15 weeks show no difference between the rate of
growth of rats on the stock diet as compared with
those on a diet in which two-thirds of the maize has
been replaced by mango-seed kernel.
SUMMARY
Investigations have been made to find if mango-
seed kernel, hitherto rejected as waste, could be
utilized as a feed for livestock.
Mango-seed kernel has been fed to bullocks with
advantage to the extent of 50 per cent. of the total
digestible protein. The animals developed a liking
for the kernels after a couple of weeks' feeding.
During about 12 weeks' feeding adult animals
gained, on an average, 33 lb. in body weight and
developed a fine condition.
Mango-seed kernel is a rich source of protein and
carbohydrate. According to available figures, it is
estimated that 70 million lb. of digestible protein
and 760 million lb. of starch equivalent will be avail-
able per annum from this hitherto unrecognized
*Since the percentage of fibre is only 2.8, it has not been
considered.