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Newspaper Page Text
VOL. XXXIII. No. 9.
Change in Guernsey Cattle Test Rules
The American Guernsey Cattle Club
made a careful study or the results of
the advanced register work upon the
basis of a one-day or a two-day test.
This investigation was undertaken
because of a demand made by many
breeder for a possible lessening of
the cost, and with the hope of curtail
ing the necessity of having the testers
at the farms for so long a period each
The result of this investigation was
COMPARISON OF ONE AND
Forty-one cows selected at random
from 38 herds where advanced register
testing is being done show the follow
Sixteen cows gave during the year
an average of 3.23 pounds more of
butter-fat on one-day test (using first
one-day) than on two-day test.
Twenty-live cows gave during the
year an average of 5.10 pounds less
butter-fat on a one-day test (using
first day) than on a two day test.
The 41 cows gave 19,1334.21 pounds
butter-fat with a two-day test.
The 41 cows gave 19,058.37 pounds
butter-fat with a one-day test, or an
average of 1.85 pounds less butter-fat
per cow during the year.
Seven cows varied less than one
pound butter-fat in a year; five cows
less than two pounds; seven cows
less than three pounds ; four cows less
than four pounds; live cows less than
five pounds; 11 cows between live and
10 pounds; two cows over 10 pounds.
The least amount of variation in
the 41 cows was .12 pound and the two
largest were 13. G3 and 16.35 pounds
While the above seemed to show
that a one-day test was reasonably
effective for the work of the advanced
register, yet the officers felt that it
was wise to obtain data from a much
larger number of cows and submit
Imp. Caridad, Reg. No. 23560. Miss Coraline of Oregon. See page 12.
KENT and SEATTLE WASH., MAY i, 1913.
same to a wholly disinterested person.
The records for 250 cows were then
worked oat at the office and the
following results obtained:
The 250 cows gave a total of 13,536.49
pounds butter-fat in one year with a
two-day test, and 13,520.84 pounds
butter-fat in same length of time with
a one-day test, or a total of 15.65
pounds less butter-fat with a one-day
One hundred fourteen cows gave
527.02 pounds more on a one than a
two-day test, or an average of 4.62
pounds more per cow, and 136 cows
gave 581.01 pounds less on a one than
a two-day test or an average of 4.27
pounds less per cow.
The complete records of the above
250 cows were then submitted to Prof.
Thorndike of Columbia University for
review from a mathematical stand
point to show the possibilities and
variations that might occur. An ex-
Imp. Mythops Sequel, Miss Coraline of Oregon, Lassie of Ledyard 2nd.
haustive study of the records was
made and Prof. Thorndike submitted
to the committee the following as a
summary of his conclusions:
"I beg to report that calling the
Imp. Mythop's Sequel, Reg. No. 18418, Two Years Old. See page 12.
year's record of pounds of butter-fat
that would be obtained from tests of
every days' percentage of butter-fat,
the cow's true record, the record
calculated from a one-day test each
month will on the average differ from
the true record by six and one half
pounds. It will not differ from the
true record by more than 21 pounds
more than once in a hundied cows
and will never differ from the true
record by more than 32 pounds.
"The record calculated from a two
day test will, on the average, differ
from the true record by four and oue
half pounds. It will not differ from
the true record by more than 15
pounds more than once in a hundred
cows and will never differ from the
true record by more than 23 pounds."
Upon receiving this the ottlcers of
the club called the attention of the
other breed organizations to these
results in the interest of greater
uniformity in the work of the different
In November assurances were given
that at least two of the other cattle
clubs would adopt one day with pre-
50c Per Year; 5c the Copy
liininary milking as the period of
tests, instead of two days. Con
ferences were held with these associa
tions and with representatives of the
agricultural experiment stations.
The result of these conferences was
the adoption of a practically uniform
set of instructions governing the
supervisors of the testing.
When the question of the relative
cost of a two-day and one-day test
was asked of the experiment stations,
little encouragement of a material
reduction was received.
After considering the matter, the
other clubs decided to continue on a
The executive board of The Ameri
can Guernsey Cattle Club are solici
tous of having Iheir work conducted
under right conditions, yet are also
anxious to provide means of making
the work available to all and regard
the primal object of these advanced
registers as being the aid that they
can give to breeders in determining
in the most advantageous manner an
estimate of the comparative value of
their individual animals.
In view of the results of their study
in this matter they have adopted the
rule as given below, thus providing
for those breeders who wish to have
their records made upon iho two-day
basis, and hlso providing a one-day
basis fur those breeders unable to
carry the work uuder the conditions
heretofore imposed. It is believed
that by so d< ing the advanced register
will bo of aid to a greator number of
Commencing April 1, 19115, the rules
of the advanced register for Guernseys
regarding the period of testing each
month is as follows:
The per cent of butter-fat shall be
determined by the Babcock test for
one full day of 1M hours, or for two or
more full and consecutive days of 24
(Continued on page 17)