. Productive dairying . Dairying. QUESTIONS 346 perature for at least four hours in order that the butter fat may have time to solidify, or temper. When once thoroughly soured and cooled, cream may he held for a day or two if necessary without great injury. The pres- ence of the lactic acid prevents most other forms of bacteria from growing, whereas if it were endeavored to keep the cream sweet by low temperature for four or five days it is probable that a bitter, unpleasant-flavored bacterial gTOwth would have a Fig. 115.—Showing the effect of temperature on rate of growth of bacte
. Productive dairying . Dairying. QUESTIONS 346 perature for at least four hours in order that the butter fat may have time to solidify, or temper. When once thoroughly soured and cooled, cream may he held for a day or two if necessary without great injury. The pres- ence of the lactic acid prevents most other forms of bacteria from growing, whereas if it were endeavored to keep the cream sweet by low temperature for four or five days it is probable that a bitter, unpleasant-flavored bacterial gTOwth would have a Fig. 115.—Showing the effect of temperature on rate of growth of bacteria. a at50°r., to at 70° F. 2. The creamery system consists first in pasteurizing the cream for the purpose of destroying all, or as many as possible, of the bacteria that were brought in by the patrons and then souring or ripening it by means of a starter prepared from a pure culture grown for the purpose. A starter is essentially only a quantity of olean-flavored sour milk used to hasten and to control the growth of bacteria in the cream. This process is too long and complicated for farm dairy use. QUESTIONS 1. What relation is there between care of cream on the farm and price received for the finished butter? Explain. 2. How does cold temperature of cream preserve its quality? 3. How long after separating is it safe to try to keep cream before it is made into butter? 4. What difference in price is it fair to make between sweet, clean cream and that which is sour and off flavor? 5. What is meant by cream ripening? 6. Why is cream ripened? 7. How is cream ripened? 8. May cream be ripened too much? 9. What is meant by tempering cream? 10, Briefly, what is the creamery system of cream ripening?. 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 Washburn, Robert Mann, 1874-. Philadelphia ; London : J. B. Li
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectdairying, bookyear191
