A. L.
ROSE
193
usually rotated to another sudan crop on the farm,
returning to the original crop when the first has re-
grown. In these circumstances intoxication and
loss has not occurred, and one wonders therefor
if some sort of tolerance to the toxic factor is no
developed by the herd.
Details of poisoning of stock grazing on Sudan grass
No.
1
2
3
1
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
Date
6-3-31
March, 1931
23-2-31
14-12-31
2-1-32
6-1-32
10-1-32
6-1-32
Jan., 1932
Jan., 1932
Jan., 1932
12-12-34
23-12-34
27-12-34
17-1-35
6-12-37
10-12-37
6-12-37
4-12-37
Crop
Sudan grass . .
Sudan grass and
hybrids
Sudan grass . .
Sudan grass and
hybrids
Sudan grass and
hybrids
Sudan grass and
hybrids
Sudan grass and
hybrids
Sudan grass . .
Sudan grass . .
„ „ . .
„ „ . .
„ „ . .
„ „ . .
„ „ . .
„ „ . .
Sudan grass . .
Sudan grass . .
Sudan grass . .
Sudan grass . .
Sudan grass . .
Sudan grass . .
Sudan grass .
Sorghum sp. . .
Sudan grass . .
Broom millet
(Sorghum sp.)
Condition
Six inches high . .
Eaten right down by
grasshoppers
Eaten bare by grass-
hoppers two weeks
previously. Short re-
growth
Eaten bare by grass-
hoppers. Disaster on
regrowth
a
week
later
Eaten bare by grass
hoppers. Mortality on
re-growth two weeks
later
Eaten bare by grass-
hoppers. Mortality on
re-growth two weeks
later
Eaten bare by grass-
hoppers. Cow died on
re-growth three weeks
later
Eaten by grasshoppers.
Re-growth coming in-
to head, 12-18 inches
high
In seed . . .
„ „ . . .
„ „ . . .
„ „ . . .
„ „ . . .
„ „ . . .
„ „ . . .
18 inches. Not eaten
by grasshoppers
Eaten back by grass-
hoppers. Re-growth
starting to flower
Eaten back by grass-
hoppers and re-grow-
ing
Re-growth after being
eaten back by grass-
hoppers
Two feet and in seed .
Sparse and eaten by
grasshoppers but re-
growing
Eaten bare by grass-
hoppers. Six inches
regrowth when grazed
Eaten back by grass-
hoppers,
and
re-
growth grazed five
days later
Eaten back by grass-
hoppers. Deaths on
the re-growth
Eaten back by grass
hoppers. Death occur-
ed on re-growth
HCN content
Strong positive to pic-
rate test
(1) Sudan, 0.011%
(2) Hybrid, 0.015%.
(3) Hybrid. 0.008%
(undried)
0.050% (undried) .
0.051% (undried) .
Sudan, 0.065%
Hybrid, 0.065%.
Sudan, 0.029%
Hybrid, 0.039%.
Sudan, 0.024%
Hybrid, 0.026%.
0.031% . . .
0.028%.
0.133% . . .
0.068% . . .
0.034% . . .
0.039% . . .
0.014% . . .
0.026% . . .
0.066% . . .
0.132% . . .
0.026% . . .
Strong positive to pic-
rate test
0.084% (moisture-free)
Strong positive to pic-
rate test.
0.71% (moisture-free)
Strong positive to pic-
rate test
Strong positive to pic-
rate test
Strong positive to pic-
rate test
0.157% (moisture-free)
Results
2 cows. 1 severely affec-
ted and recovered
60 cows. 11 deaths, 15
recoveries, Deaths in
25 minutes
60 cows. 2 showed sym-
ptoms in 10 minutes
and recovered
26 cows. All affected.
Symptoms
in
5
minutes. First deaths
in 10 minutes. 17
dead in 30 minutes
Balance recovered
11 cows. 1 died in 5
minutes. 4 sick and
recovered.
4 cows. 3 dead in 15
minutes.
1 cow. Sick in 5
minutes, dead in 15
minutes.
5 cows. 1 sick in 10
minutes and died.
Fed with impunity .
„ „ „ .
„ „ „ .
„ „ „ .
„ „ „ .
„ „ „ .
„ „ „ .
fed with impunity
.
Fed with impunity .
16 cows. Symptoms
in 20 minutes. All
affected and 5 died
24 cows. Symptoms in
5 minutes, 3 dead. 12
recovered
12 cows. 6 sick and all
recovered. No symp-
toms for an hour
25 cows. Symptoms in
20 minutes, 13 sick.
6 died
20 cows. All sick, 2
deaths
6 deaths . . .
12 cattle. All affected
4 deaths
5 cows and a bull died
Remarks
No treatment
No treatment
No treatment
No treatment
No treatment
No treatment
No treatment
No treatment
These figures are of dis-
tinct interest because
the cattle were never
taken off the Sudan
paddocks and in spite
of high HCN figures
the crops were grazed
without accident
Cattle, kept continuous-
ly on Sudan crops
Cows did not relish the
crop after fouled by
grasshoppers
No treatment
The 12 recovered cattle
were treated with ether
hypodermically
and
artificial respiration
No treatment
Recoveries treated with
ether, strychnine and
artificial respiration
No treatment
No treatment
No treatment