338 THE INDIAN JOURNAL OF VETERINARY SCIENCE AND ANIMAL HUSBANDRY [ I, IV

They found in a herd consisting mostly of milk cows (an average of 75 tests on 44
cows) the blood-sugar to be 51.75 mg. per 100 cc of blood.

Hayden states that his figures from the use of the Benedict method in the
determination of sugar in the blood of the milk cow gave a low average of 41 .15
mg. per 100 cc of blood.

Schlotthauer reports that the average blood-sugar content in a group of ten
non-lactating cows was 65.45 mg. for each 100 cc of blood, the highest was 70.90
mg. and the lowest 59.85 mg.

In a group of lactating cows, yielding from 8 to 30 pounds of milk daily, the
blood-sugar averaged 63.59 mg. per 100 cc of blood, with a range from 68.45 mg. to
59.98 mg. In another group of lactating cows, yielding from 45 to 58 pounds of
milk daily, the blood-sugar averaged 61.19 mg. per 100 cc of blood with a range
from 68.72 to 52.9 mg.

Amadon reports that the normal average sugar content of blood samples
secured from thirty-five lactating and non-lactating cows and one bull was 68.5 mg.
per 100 cc of blood, with a range of from 40 to 86.9 mg.

Hewitt found the blood-sugar average of 94 determinations on four heifers,
one bull and one steer under two years of age, was 95.9 mg. per 100 cc, and that
the blood-sugar average of eight determinations on three non-lactating cows was
89.1 mg. per 100 cc of blood, whereas the blood-sugar average of eight determina-
tions on three lactating cows was 54.1 mg. per 100 cc of blood.

Widmark and Carlens state that the blood-sugar for the dry cow and heifer is
around 80 mg. per 100 cc, and for the milking cow as low as 40 mg. per 100 cc,
with an average of 60 mg. Auger confirmed the findings of Widmark and Carlens.

Maguire states that the sugar content of the blood of the cow normally ranges
from 80 to 120 mg. per 100 cc of blood.

From the above investigations it is apparent that the sugar concentration in
the blood of cows is subject to quite wide variations but the general conclusion can
be drawn that the sugar level is lower in lactating cows than it is in heifers and
non-lactating animals.

Widmark and Carlens report the successful treatment of cases of milk fever
by the use of glucose injections. They found an increase in the blood-sugar after
udder inflation of cows suffering from this disease and they conclude that hypogly-
cemia is an etiological factor in milk fever.

Hayden and Sholl report the blood-sugar findings for fourteen cases of milk
fever which showed 35.7 mg. to 190.4 mg. per 100 cc, with an average of 99.42 mg.