. Dairy farming. Dairying; Cattle. MILK AND ITS PRODUCTS 179 they will dry quickly. It is well to set them in the sun dur- ing the day. Coldness is as important as cleanliness. Keeping milk clean keeps most of the bacteria out. Cooling it prevents the growth of those that do get in. Effective cool- ing means bringing the temperature of the milk, not later than an hour after milking, and prefer- ably sooner, to a temper- ature of 50° F., or lower. In an experiment by the author a sample of fresh milk was divided into two parts, one of which was cooled at once to 50° F., while the other was plac
. Dairy farming. Dairying; Cattle. MILK AND ITS PRODUCTS 179 they will dry quickly. It is well to set them in the sun dur- ing the day. Coldness is as important as cleanliness. Keeping milk clean keeps most of the bacteria out. Cooling it prevents the growth of those that do get in. Effective cool- ing means bringing the temperature of the milk, not later than an hour after milking, and prefer- ably sooner, to a temper- ature of 50° F., or lower. In an experiment by the author a sample of fresh milk was divided into two parts, one of which was cooled at once to 50° F., while the other was placed at 75° F., with the fol- lowing results:. Fig. 50. — Brush for cleaning milk utensils. The brush is much better than a cloth. Held at 50° F. Held at 75" F. Bacteria per in fresh milk . Bacteria per after 12 hours Bacteria per after 24 hours Age of milk at first souring . 21,000 20,000 32,000 3 days 21,000 110,000 10,450,000 28 hours Putting warm milk in an ordinary ice box is not an effec- tive method of cooling, as can be readily determined by testing it with a thermometer. The importance of the statement regarding the necessity for sudden cooling and the inefficiency of cold air as a means of cooling is illus- trated in a striking way by an experiment conducted by students under the supervision of the author. Sixteen gal- lons of fresh warm milk was received from the barn, mixed, and then placed in two cans. Plate cultures were made. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Eckles, C. H. (Clarence Henry), 1875-1933; Warren, George F. (George Frederick), 1874-1938, joint author. New York, The Macmillan company
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectdairying, bookyear191
