CLEANLINESS IN DAIRYING-

New Zealand Mail, Issue 1774, 7 March 1906, Page 61

CLEANLINESS IN DAIRYING-

A PRACTICAL PROOF OF ITS NECESSITY. Cleanliness in dairies is so much preached that dairymen are apt to get tired of the subject. The anti-dirt campaign is one that has to be kept going. Recent experiments to show the number of bacteria in quantities of milk differently treated are of much interest. Apparently it takes a considerable number of bacteria to work much mischief, but dairymen will, see that the increase under certain circumstances is startling, and will recognise hew simply this can be prevented. Some of these experiments are as follow: Experiment 22a.—Two litres (about two quarts) of sterilised milk in a sterile pail were exposed seven minutes to the stable air in passage behind 1 the cows. Number of bacteria, a cubic centimetre on account of this exposure, 2800. * Experiment 22b.—The saihe as A, except that the milk was exposed under the cow’s udder while the milker was going through the motions of milking, but not drawing streams from the teats. No particular care had been taken to clean the udder. Number of bacteria a cubic centimetre on account of this ex posure, 142,600. Experiment- 20b. —Same as 22b, except udder was cleaner, vNumber of bacteria, 4750. Experiment 23.—Several pails were rinsed with buttermilk. They were then cleaned in different ways as below, 1000 cubic centimetre on account of this exsterile milk, -was put into each one and rinsed around about one minute; then the number of organisms in this milk wa« determined. First.—Pail not washed or 'rinsed; number of bacteria a cubic centimetre, 4,414,000. Second. —Pail rinsed with cold water; number of bacteria a cubic centimetre, 130.000. Third.—Pail carelessly washed! and rinsed with warm water; number of bacteria a cubic centimetre, 14,800. Fourth. —Pail carefully washed with brushes and rinsed with hot water; number of bacteria a cubic centimetre, 11,200. Fifth.—Pail carefully washed and steamed in steriliser 20 minutes; number of bacteria a cubic centimetre, 4600. Sixth.—Pail carefully washed, covered -with cloth, and steamed in steriliser 20 minutes; number of bacteria a cubic centimetre, 2800. Seventh.—Pail carefully washed, covered with cloth, and sterilised in autoclay one hour; number of bacteria a cubic centimetre, 1200.