'^ ' . . 5 y' <^ "^^o^ ^^^, 0-' '^^ - .^ ^^ •^^ 'W^- / V -A. ....,♦ -i'' • D .S tl V .^^^^ s * V P " • > -y#^* .v- \ -A, ,. V 'v- ^7' ' ^ « %'*'o, .,** .•';4,% *' O. "»,-.* * ^^ "> <5> * J, . o ^ ^^ o " C "" h-t (a > I— I "A- o Q < c < Si a: FANCY CHEES IN AMERICA FROM THE MILK OF COWS, SHEEP AND GOATS BY GHAS. A. PUBLOW, A. B. M. D. C. M. ASSISTANT PROFESSOR OF DAIRY INDUSTRY IV THE NEW YORK STATE COLLEGE OF AGRICULTURE AT CORNELL UNIVERSITY AMERICAN SHEEP BREEDER COMPANY CHICAGO ^gy^ ILLINOIS ^^^^! DEDICATION This little book is affectionately dedicated to my friend and predecessor, W. W. Hall, for many years instructor in cheesemaking at Cornell University, as a slight token of appreciation and admiration for his untiring efforts in building up this department of the college, in assisting young men to success, and in building up the cheese industry of the Empire state. Copyrighted 1910, by AMEKICAN SHEEP BEEEDER CO. All Eights Eeserved. ©C!.A^73899 PREFACE. The making of fancy varieties of cheese is now one of the most profitable branches of the great dairy industry. Millions of pounds of fancy or soft cheese are imported annually from foreign countries, largely because the supply of home-made goods is not sufficient to meet the demands. This is not because just as good cheeses cannot be made in this country. They can be, and in many instances the home-made cheese are better. The main reason is that f ao- torymen in America, as a rule, do not know how to make these fancy cheeses and have had no way of learning. Those who know anything about the methods employed have kept them secret and the information contained in dairy books has been too indefinite or incorrect to be useful. In order to make any educational progress along this line, it has been necessary for us to work out most of the problems for ourselves, and in our investigations and experimental work nothing has proved as useful as the acid test. By its use we are able to measure and control the greatest factor in the making of all cheese. Without its use the business consists only of guess work. In all our directions, therefore, 4 PKEFACE. we give the amounts of acidity required, in the form of percentages as measured with an acid test. Any person can use one of these simple tests and the different manufacturing process ^ are made easy by its use. Attention is called to the importance of pas- teurizing all milk used in making many forms of the soft cheese. In factory work it is prac- tically impossible to secure a regular supply of milk of reliable quality, but by pasteurization we can secure a bacteria free, uniform raw ma- terial. Then by the use of commercial cultures of lactic acid bacteria as starters, we can secure uniformly fine quality in the finished cheese, and all danger of transmission of disease through cheese or whey is eliminated. The author has also demonstrated that it is possible to make fine Cheddar cheese from pasteurized milk, the particulars being given farther on in the book. Practically all varieties can be made from the milk of cows, sheep and goats. The composi- tion of these milks is so similar as to require litfle or no change in the manufacturing proc- esses. Goat^s milk is especially valuable for nearly all varieties as well as for some spe- cial varieties, such as are made in foreign coun- tries. In all descriptions of the manufacturing processes an effort has been made to state clear- PBEFACE. 5 ly each step so that inexperienced persons may readily succeed in obtaining satisfactory re- sults. All directions do not agree with for- eign recipes, but represent facts which have proved most useful to the author in actual prac- tice, and are here assembled in book form, with the hope that they may prove of equal value to those interested in the manufacture of fancy cheese, or as a text-book for students in agri- cultural colleges and dairy schools. Chas. a. Publow. June Ist, 1910. INDEX. Page. Brick 24 Brie 63 Buttermilk - - - - - - - 81 Caciocavallo -------- 53 Caiuembert - - - - - • - i>6 Caraway-potato - - - - - - - 89 Casein Making ..-.--. 93 Cheddar 8 Cheesemaking Facts ------ 95 Club - 90 Commercial Starters .--... g Cottage - - - - - - - - 74 Cream -..--.--. 85 Edam - - 31 Emmenthal 26 Goats' Milk 66 Gorgonzola - - - - - - - - 41 Gouda .-..-.. - 35 Isigny --..--.-- 71 Limburg ........ Qf Milk Composition .---.- 7 Miniature .... . - - 73 Munster ........ 4,j Neufchatel - . - ... -^-j-92 Oka ■ - - - - 66 Olive Cream - . . ... - 90 Pimento 89 Pineapple - . . . . . 22 Pont 1' Eveque --.-..- 49 Port du Salut - - - - - - - 51 Eicotto .-.-...- 55 Boquefort ...... - 43 Sage 21 Sandwich-nut - - - - - - - 88 Skimmed Milk Cheddar - - - • - - 14 Smearcase - - - - - - - 74 Stilton 37 Stirred Curd Cheese - - - - - - 13 Swiss 26 Switzer - 26 Washed Curd Cheddar 13 Fancy Cheese in America. MILK COMPOSITION. For the convenience of persons who are inter- ested in the handling of cow^s and goat's milk, the following comparative figures of average composition are given: Cow's Goat's Human milk. milk. milk. Water 87.00% 86.50% 87.41% Fat 4.00% 4.50% 3.78% Casein 2.60% 3.25% 1.85% Albumin 70% .82% .44% Sugar 5.00% 4.20% 6.21% Ash 70% .73% .31% 100.00% 100.00% 100.00% In the making of all varieties of cheese, pure, clean, sweet milk is the greatest requirement. Without this, the cheesemaker's art is very limited, but with it, both quantity and quality in the finished cheese are assured. For meth- ods to be employed in securing a clean milk supply, the reader is referred elsewhere, as space will not permit of even so important a subject in this treatise. No cheese book would be complete, however, without some reference to the preparation and use of commercial cul- 8 FANCY CHEESE IN AMEEICA. lures of lactic acid bacteria as starters. Before starting the actual technique of cheesemaking, the question of starters and their use should be familiar to all persons. COMMEECIAL StAETERS. These are cultures of lactic acid producing bacteria which are prepared by bacteriologists and sold in a commercial way, accompanied by directions for their use. In their preparation for use in cheesemaking, a small quantity of milk (1 to 3 quarts) is heated to the boiling point for several minutes. This treatment de- stroys all living bacteria. The milk is then cooled to a temperature of 90° Fah. and the culture of lactic acid bacteria added. The tem- perature is then allowed to drop gradually to 70° Fah., where it is held for 24 hours, or until the milk becomes sour and thickened. A larger quantity of milk is then pasteurized to at least 165° Fah. for 30 minutes and cooled to 70° Fah., when the prepared sour milk is added. By a continuance of this procedure a pure, clean, reli- able and uniform starter is available each day, the intelligent use of which will do much in de- termining quality in the cheese. Cheddar Cheese. Cheddar cheese derives its name from the vil- lage of Cheddar in England and is the variety of cheese made in largest quantity in Canada FANCY CHEESE IN AMEEICA. 9 and the United States, as well as in some other countries. It is a cheese of firm body, smooth texture, characteristic flavor and possessing long-keeping qualities. It is usually marketed in a number of sizes, which are recognized in the markets as follows : A large cheese, about 15 inches in diameter, weighing about 80 lbs., constitutes an ^' export^'; one of similar diam- eter, weighing about 35 lbs., '^a flat,'^ or if shipped two in a box, ** twins'*; a 20-lb. size, **daisies*'; 8 to 10-lb. size, ^^ young Americas*' and a 2-lb. size, ^'midgets." Method of Manufacture for Home-trade Ched- dars, Milk is heated to 86° Fah. and ripened by the use of a commercial starter or naturally, until it reaches about .20% acidity. Usually %% to 2% of a starter is sufficient to ripen milk. If colored cheese are desired, cheese color at the rate of 1 oz. per 1,000 lbs. of milk is added and stirred evenly through the entire mass. About 3 oz. of rennet extract diluted in 20 times its weight of cold water is then added and 4 or 5 minutes should be taken in stirring it in. In 8 or 10 minutes after adding the rennet, the milk will commence to thicken, but should not be disturbed for 25 or 30 minutes, or until it has become a fiiTQ, solid mass that will split clean ahead of the finger. When it has reached this 10 FANCY CHEESE IN AMERICA. state it should be cut into small cubes, using first a %-in. horizontal knife lengthwise of the vat, then a 5/16-inch perpendicular knife cross- wise and finally lengthwise of the vat. The curd and whey will then begin to sepa- rate and should be stirred gently with a wooden rake or similar instrument to keep the par- ticles from lumping. In a few minutes, or as soon as the whey surrounding the curd shows an acidity of .14%, the temperature should be raised gradually (25 to 30 minutes) to 98° Fah., at which temperature it is held until the par- ticles become firm and springy, and the whey has increased in acidity to .18%. Then the whey should be removed rapidly, so that by the time it is all off and the curd stirred sufficiently dry, the whey running from the curd, which is piled about 8 inches deep along the sides of the vat, will show not more than .26% acid. The opera- tions from the time of adding the rennet till the whey is off requires at least 2 hours* time. In 15 minutes, or as soon as the curd has become firmly matted, it should be cut into strips 6 inches wide and turned over. This allows all free whey to escape. The curd should then be turned every 15 minutes until it be- comes meaty in texture and the whey running from it shows .65% acid. It is then ready for milling and should be cut into pieces of uniform FANCY CHEESE IN AMEBICA. 11 Cropper. bottU V \ burette heWer r> d-5r4n pipen^ V CU)» The Publow Acid T 12 FANCY CHEESE IN AMERICA. size. After a few minutes' stirring, salt is ap- plied at the rate of about 2 lbs. for each 100 lbs. curd. At least three divisions of the salt are necessary for an even distribution. As soon as the curd has become mellow after salting, it should be placed in cheese hoops and pressed. In about one hour they can be re- moved from the press and the bandage pulled up and trimmed. They should then be put back in the press and left for 18 to 24 hrs., when they should be wiped dry and placed on shelves in the curing room and kept at a temperature as near 55° Fah. as possible. AVhen 4 or 5 days old they should be dipped for 8 to 10 seconds in hot paraffin at 220° Fah. A coating of paraffin prevents shrinkage and keeps the cheese sur- faces clean. Cheese should be turned on the shelves daily while ripening and should not be offered to consumers until at least one month old. (For a detailed study of cheddar cheese- making, consult ^* Science and Practice of Cheesemaking,'' published by Orange Judd Co., New York City. Compositiofi of Cheddar Cheese. Fat 32.00 Casein 26.00 Water 37.00 Sugar, ash, salt, etc. . . . 5.00 100.00 fancy cheese in ameeica. 13 Stirred Curd Cheese. This is a variety of cheddar cheese, different only in the details of manufacture. The regular cheddar method is followed up to the time of removing the whey. Then instead of allowing the curd to mat into a solid mass, it is stirred sufficiently to keep the small particles sepa- rated until j&rm and rather dry. Salt is then added and the cheese finished in the usual way. This is sometimes called the granular method and was used almost entirely before the days of the curd-mill. Washed Curd Cheese. This is another variety of cheddar cheese that has met with favor on certain markets in re- cent years. The cheese are made by the regu- lar cheddar method up to the time of milling the curd, when the curd is immersed in cold water for several minutes before salt is added. About the only advantage in adding the water is to cause the cheese to soften at an early date. If the curd is left in the water five minutes or longer it will increase in weight by absorbing water. The colder the water the more rapidly it is absorbed. At the same time some of the lactic acid, sugar, fat, rennet and salts are removed, with the result that the cheese develop little or no flavor unless they have been soaked in the water too long, when the cheese will spoil 14 FANCY CHEESE IN AMEEICA. and smell badly in a short time. The cheese spoil owing to the absence of the natural ripen- ing agents, which have been removed in the water. Abnormal changes then occur through the work of undesirable forms of bacteria. The best washed curd cheese are made from the best cheddar curds, which are immersed in pure water at 60"^ F. for not more than 2 to 5 minutes. Skimmed Milk Cheddae Cheese. During recent years, in some states, there has been a marked increase in the number of ched- dar cheese made from skimmed milk. The manufacture of such imitation products has been stimulated by the comparatively high prices paid by buyers, as compared with the market prices of full milk cheddars. Probably this condition is backed up by the fact that cheesemakers are able to remove part of the fat from the milk and replace it with moisture in the cheese, with such skill that the consumer believes he is eating a rich, mellow cheese, when in reality it may have been made from only 2^ skimmed milk. The method of manufacture to follow in mak- ing such cheese must vary according to the amount of fat in the milk. The less fat present, the more difficult it is to secure cheese of pass- able quality. The great variation in the fat FANCY CHEESE IN AMERICA. 15 content of skimmed or partly skimimed milk makes it impossible for one to give accurate directions to be followed as an unmodified rule. We, however, are safe in giving the directions for making up to 2% milk and in making up sep- arator skimmed milk. The maker can then vary the details as he varies the composition of the milk. Cheese from 2% Skimmed Milk. Milk should be heated to 84° F. and ripened by some good commercial starter or clean flavored buttermilk, until it shows an acidity of 22%. (It is seldom advisable to use more than 2 pounds of starter to each 100 pounds of milk.) If colored cheese is desired, cheese color is added at this time. Usually one-half ounce to 1,000 pounds milk is sufficient. Enough rennet extract (3 ounces [90 c.c] per 1,000 pounds milk) to coagulate the milk fit for cutting in 20 minutes is then added after being diluted in 20 times its volume of cold water. As soon as the milk is firmly coagulated, it should be cut into cubes about % inch square by the use of horizontal and perpendicular curd knives. The curd is then stirred gently with a wooden rake or agitator to keep the particles separated, and the temperature raised gradually to 92° F. In about 30 minutes after cutting, as soon as the curd begins to feel firm and springy, and as 16 FANCY CHEESE IN AMEKICA. soon as the whey surrounding the curd shows an acidity of .17%, the whey should be quickly removed. While the whey is running off, the curd should Be constantly stirred, in order to insure a proper expulsion of whey and a uni- form color in the cheese. After the whey is Cheddar Curd Knives. off, the curd is packed about 8 inches deep along the sides of the vat with a space in the center for drainage. The whey running from the curd at this time should contain not over .24% acid. As soon as the particles have become firmly matted, the curd should be cut into strips 8 to 10 inches wide and turned bottom side up. In Stilton Cheese. (See Page 37 ) Cross-section of a drum Swiss cheese, showing location, size and glossy condition of the ' ' eyes. ' ' (See Page 26.) ■ ■l jH /v^^l 1 1 1 Pl Photograph showing amount of cheddar cheese available iv 100 pounds of 3%, 49c, 5% and 6% milk. (See Page 9.) ^ . Jn fI^I ^ .-'^^^^^1 Bk 1 ^t* J P^^^^^^ ^ K 1 1 ,* 1 j j^^ ^ r — — - - ^. **^ ^IBBi^tt»v. c.c. of rennet extract are diluted with a few ounces of cold water and added and stirred separately into each can. In about 18 hours the milk should be firmly coagu- lated and the whey which separates from the curd should have an acidity of about .35%. The curd is then dipped on to a cotton-covered strainer rack, or into cotton bags, to drain. While draining, the contents of the draining bags or rack should be stirred occasionally to insure an even expulsion of whey and prevent the formation of hard, dry particles. As soon as the curd is sufficiently dry, or when all indi- cation of free whey has ceased, 1 to 2 pounds of rich cream is added and then 2% ounces of salt to each 10 pounds of cheese. After salting, the cheese should be allowed to stand for at least an hour in a cool place, so that any whey which is still present may escape. If this is not done FANCY CHEESE IN AMEEICA, 87 the cheese are liable to leak after packing. When sufficiently dry the cheese is pressed, either by hand or power devices, into rectangu- lar shapes I%x2i/4x234 inches and wrapped in parchment paper and tinfoil. Cream cheese of this size will weigh % pound and retails for at least 10 cents each. One hundred pounds of 4% milk, plus the added cream, will make ap- Parts of a Cream Cheese Mold. proximately 22 pounds of cheese, so that it yields a large profit. Average Composition of Cream Cheese. Water U% Fat 40% Proteid 12% Sugar, lactic acid, etc. . . 3% Ash 1% 100% Qualities of Cream Cheese. Cream cheese should be clean in flavor, with a distinct mild aroma resembling fresh butter. 88 FANCY CHEESE IN AMEEICA. It should be of a creamy consistency with plenty of body, but entirely free from lumps. When kept in a cold place cream cheese will remain in good condition for at least 10 days, but de- teriorates rapidly in hot weather. It makes a very desirable lunch cheese and is much used for this purpose. Defects in Cream Cheese, The defects, with their causes and remedies as described under cottage cheese, apply with equal importance to Neufchatel and cream cheese. Sandwich Nut Cheese. This style of cheese originated in the Depart- ment of Dairy Industry of the New York State College of Agriculture, and is one of the most delicious varieties of soft cheese, being much used in the preparation of cheese sandwiches. Method of Manufacture. To 10 pounds of cream cheese add one-half pound of mixed walnuts and almonds. The nuts should first be blanched by soaking in hot water for a few minutes and then removing the dark- colored skins with the fingers. The nuts are ground finely in a meat-mincing machine and mixed evenly through the cheese, which is pressed into the regular cream cheese mold and wrapped in parchment paper and tinfoil. These weigh one-fourth pound and retail at 10 cents each or 40 cents per pound. fancy cheese in america. 89 Peppeb-Cream Cheese or Pimento. This variety of cheese was first suggested by Mr. J. D. Frederickson of Chr. Hansen's Labo- ratory, Little Falls, N. Y., and is used considera- bly by those persons who desire spicy food- stuffs. Method of Manufacture. To 10 pounds of American Neufchatel cheese add one-fourth pound to one-half pound of red peppers. The peppers should first be put through a meat-mincing machine and ground to a pulp. The cheese and peppers are then mixed and pressed into rectangular shapes, weighing about one-fourth pound. These usu- ally retail at 40 cents per pound and must be kept in a cool place. Caraway Potato Cheese. This is a soft cheese, of rather peculiar flavor, due to the method of manufacture and the in- gredients used. The process has recently been developed by the Department of Dairy Indus- try of the New York State College of Agri- culture at Cornell University, and is very simple. Method of Manufacture, A small quantity of American Neufchatel cheese is made in the regular way. Before salt- ing, however, mashed boiled potatoes are added 90 FANCY CHEESE IN AMEHICA. at the rate of 1 pound to 1 pound of cheese. Salt is then applied at the rate of 2 ounces for 10 pounds of cheese. A few caraway seeds are sprinkled over the curd and the whole mass thoroughly mixed in a large wooden dish. The cheese is then pressed into suitable shapes, weighing one-fourth pound each, and wrapped in parchment paper. They are ready for use as soon as made, but improve if kept in a cool place for a few days. Olive-Cream Cheese. This cheese also originated in the Department of Dairy Industry of the New York State Col- lege of Agriculture, and is used for the same purposes as Sandwich Nut Cheese. Method of Manufacture. To 10 pounds of cream cheese add the meat of 2 dozen olives. The olives are first stoned and then ground to a pulp in a meat-mincing ma- chine. The cheese and olives are then mixed and pressed into cylindrical shapes similar to American Neuf chatel cheese. These weigh about one-fourth pound each and retail for 40 cents per pound. They are wrapped in parchment paper and tinfoil, and if kept in a cold place remain in good condition for at least 10 days. Club Cheese. Club cheese is one of the most common varie- ties of fancy cheese, being manufactured most FANCY CHEESE IN AMERICA. Ql extensively in Canada, New York and Michigan. For those persons who desire a pronounced flavor and taste, together with a smooth soft texture in cheese, the club variety answers the purpose better than any other. One important quality in club cheese is that it can be spread easily on biscuits or bread, and for this reason it is used on almost every occasion when cheese is served. Method of Manufacture. The method of making club cheese is very simple and yet it requires considerable skill to manufacture a uniformly good product from day to day. The most important factor is the use of suitable raw material, viz., cheddar cheese and butter of good quality. The amount of each of these constituents to be used is de- termined by the quality of the cheese used and the keeping quality desired in the club cheese. The method consists in simply grinding up some well-ripened cheddar cheese of good flavor in a meat-mincing machine and adding a certain amount of good butter to increase the softness and richness of the cheese. If a fairly strong flavored cheese is desired, cheese six months to one year old should be used, while if a milder taste is preferred, cheese about three months old is better. If the cheese to be ground up is dry in texture, it will require more butter to 92 FANCY CHEESE IN AMEEICA. make it smooth than would be required by a softer cheese containing more moisture. Gen- erally speaking, for home use and for reason- ably quick consumption, 1 pound of butter to 8 pounds of cheese make very desirable propor- tions. The mixture of cheese and butter is usu- ally run through the mincing machine a second time and then kneaded by hand to remove all possibility of lumpiness. In large factories a machine is used for this purpose. Occasionally a small amount of mustard or brandy is added to suit the taste of consumers. Hoiv Cluh Cheese Is Marketed. Club cheese is usually packed in glass or wrapped in tinfoil. When jars are used they should be of a size that can be conveniently used on the dinner table or for picnics, lunches, etc. In packing, the jars are first smeared on the inside with melted butter to prevent air spaces between the cheese and the glass where mold might grow. The jars are filled to within one- quarter inch of the top, covered with plain tin- foil, and then with a tightly fitting cover. When desired in smaller quantities, the cheese can be more profitably put up in small packages, wrapped first in waxed paper and then in tin- foil. Club cheese usually retails for about 40 cents per pound. When stored in a cool place it will keep for some time. FANCY CHEESE IN AMERICA. 93 Casein Manufactuke. During recent years the demand for casein to be used in the manufacture of buttons, knife handles, billiard balls, paper sizing, etc., has in- creased to such an extent that much skimmed milk is now used for this purpose. The dif- ferent uses to which the prepared casein is put, determine to a great degree the process of its manufacture, but for all general purposes this may be divided into two classes — natural casein and acid cooked casein. Natural Casein Manufacture. Skimmed milk is placed in a wooden or tin vat and heated to 115° F. About 10% sour whey or buttermilk is then added and enough rennet diluted in cold water (1 ounce to 5,000 pounds of skimmed milk) to coagulate it in 2 hours. As soon as it thickens, the temperature is raised to 120° F., in order to render the curd tough and firm. After a few minutes stirring with a wooden hayrake, the whey is removed and the curd placed on trays in a drying kiln, after which it is run through a mill and packed in bags for shipment. One hundred pounds of skimmed milk makes about 3 pounds of casein, which markets for 5 or 6 cents a pound. The whey from this process is useful for hog feed- ing purposes. 94 FANCY CHEESE IN AMERICA. Acid Cooked Casein, Skimmed milk is placed in a wooden vat and heated by direct steam or otherwise to 120° F. Enough sulphuric acid (usually 1 quart to 1,000 pounds skimmed milk) is then added to effect a clear separation of the curd from the whey. The acid should be diluted in 5 times its weight of cold water, and be added gradually so that too much may not be used. Sour milk requires less acid, and an excess causes difficulty in the gathering of the curd into a solid mass. After the curd is precipitated and the whey is clear, it should be drawn off, leaving the curd in the bot- tom of the vat. The curd is then covered with clean cold water and stirred vigorously so that the water can remove all acid from the curd. This water is drawn off and fresh water put on and heated by direct steam to at least 175° F. The curd is then stirred until it forms into a solid mass about the consistency of bread dough, when the water is removed. The curd is then placed on a shelf or clean floor to dry and sear over. It is then ready for shipment. Sometimes it is dried in kilns at the creamery and ground up before shipping. Casein thus prepared nets only about 15 cents per 100 pounds of skimmed milk. In stirring the milk while adding the acid, a wooden rake is used, FANCY CHEESE IN AMERICA. 95 but for stirring the curd in the hot water, a solid iron garden rake is better. The whey from casein made in this way contains much acid and should not be used for feeding purposes. Cheesemaking Facts. The cleaner the milk, the better the cheese. The richer the milk, the richer the cheese and the greater the amount of it. A clean flavored commercial starter, properly used, determines the flavor of the finished cheese. Six factors that influence cheese texture are fat, moisture, rennet, salt, bacteria and mold. The controlling of moisture and acidity is one of the most important problems in all cheese- making. No part of cheesemaking equipment is more useful than an acid test. The lower the temperature necessary to prop- erly firm curd for any cheese, the smoother and better will be the texture of the finished product. Cheese made in imitation of imported prod- ucts must be so designated and branded, in or- der to comply with the requirements of the laws of the United States and Canada. The growth of mold on cheese surfaces, forms certain products which neutralize the cheese acid and soften or liquefy the interior. 96 FANCY CHEESE IN AMEBICA. Molded cheese ripen from the outside in- wards. Three minutes' stirring is usually sufficient to thoroughly mix rennet with milk. Pasteurization of milk eliminates undesirable fermentations and disease-producing bacteria from fancy cheese and their by-products. A clean factory, properly equipped, with a good water supply and system of sewage dis- posal, is a large factor in determining the qual- ity of cheese. 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