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Principal Supplementary
Dealers licensed, to sell
Tuberculin Tested Milk; 145 25
Thirty-five samples of Tuberculin Tested Milk (farm bottled)
were submitted for examination during the year. Nine failed to pass
the prescribed tests and in each case particulars were forwarded to the
Ministry of Agriculture, Fisheries and Food. The following table
summarises the details of the samples taken
Designation
No. of
samples
Methylene
blue test
Passed
Failed
Tuberculin Tested
(Farm bottled) 55 26 9
Milk (Special Designations)(Pasteurized and Sterilized Milk)
Regulations. 1949/55
Milk in relation to which the special designation "Pasteurized"
is used shall be pasteurized, i.e.
(a) retained at a temperature of not less than 145°F. and not
more than 150°F. for at least 30 minutes (the "Holder" system); or
(b) retained at a temperature of not less than l6l°F. for at
least 15 seconds (the "High Temperature, Short Time" system).
Milk treated by either system must be immediately cooled to a
temperature not exceeding 50°F.
Pasteurized Milk samples are subjected to the phosphatase and
methylene blue tests. The former is to test the efficiency of the treatment
as to whether or not the milk has been properly pasteurized or whether any
raw milk has become mixed after treatment. The methylene blue test shows
the keeping quality of the treated milk.
Sterilized Milk must be filtered or clarified, homogenised and
heated to and maintained at such a temperature, not less than 212°F. for
a period as to ensure its compliance with the prescribed turbidity test.