lew Approach Found
or Milk Fat Testing
For the first time in nearly 80 Manfred Kroger, assistant pro
years. milk fat testing in the fessor of food science at The
United States may use a new ap- Pennsylvania State University,
preach. An instrument develop- If legally accepted, the new
e d'in Denmark, faster and safer method will replace the present
thflri methods used since the Babcock test and the Gerber
1890’s, is making a bid for ac- test.
ceptance. The Danish instrument uses
Testing of the Danish instru- the principle that opaqueness of
merit' is underway in university milk is caused by protein and
andl' industrial laboratories in fat globules suspended in emul
sev*oral countries, according to slfied form throughout the milk.
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CfIPD ALLEN H. MATZ, Inc.
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The fat and protein cause light
to be scattered and absorbed
throughout the solution.
When the milk protein is dis
solved and the remaining fat
globules are homogenized to a
uniform size, light dispersion
and absorption depend only on
the number of homogenized fat
globules which are proportional
to the fat content of the milk.
Light passing through a sample
is picked up by a photometer
and indicated as milliamperes
on a scale reading per cent fat.
Fat percentage of a milk sam
ple can be determined in about
30 seconds. Dr. Kroger says. In
contrast, the Babcock test and
the Gerber test require about 20
minutes to determine fat con
tent. No flammable solvents or
acids are used in the Danish
system as with the other meth
ods.
Dr. Kroger and associates be
lieve this Danish milk fat tester
will be especially useful for milk
companies handling large num
bers of butterfat tests daily. It
will also benefit the Dairy Herd
Improvement Associations which
test milk samples among herds
in all states. Such testing helps
to evaluate cow performance
In addition, federal, state, and
local control agencies use milk
fat tests to determine whether
market milk has the required
minimum fat content.
Tulips Bloom
At Hershey
John P. Meszaros, director of
the Hershey Rose Gardens & Ar
boretum, announced that unsea
sonably warm weather has ad
vanced by one week the peak
bloom period of the 30,000 tulips
Best bloom is now expected
from April 21 thru May 5.
Lancaster Farming. Saturday. April 27.1968
Foot-Mouth Virus Separated
A more sensitive test for mouth disease is the great do
studying the structure of foot- gree of differentiation of the
and-mouth disease virus shows causal virus. It has seven dif
that a preparation of pure virus ferent serolo g icnl types, corn
can be separated into two sub- . ... ® , ~
strains, aU. S. Department of P ared Wlth threc ° r P° lio
Agriculture scientist said recent- virus. Each foot-and-mouth dis
ly. ease viral type has up to 25 sub-
Dr. Keith M. Cowan, a re
search microbiologist in USDA’s
Agricultural Research Service,
said that the key to finding two
viral sub-strains lies in studying
antibodies in blood samples col
lected 7 days after a laboratory
animal is infected with the dis
ease. Ordinarily, the most sensi
tive tests are done with blood
collected at least 30 days after
infection. Dr. Cowan spoke be
fore the annual meeting of the
Federation of American Socie
ties for Experimental Biology in
Atlantic City. N.J.
A major problem confronting
scientists who study foot and
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Truddh is a totally new achievement
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types, which in turn can be
classed into a large number of
strains. Dr. Cowan’s research
complicates the classification
even further, by showing that
there are sub-strains which have
different chemical characteris
tics, causing them to produce
separate antibodies.
It remains to be seen what the
true nature of the two strains
is, how they may influence the
disease process, and whether
vaccines prepared from them
are equally good. Dr Cowan
said.
19