- Lancaster Farming. Saturday. June 6.1970 22 Local Official Gives History of Batterfai Test Milk-O-Tester May Be Industry Breakthrough B> Victor Plaston Associate Cmmt> Agent The price of milk is determined b> its fat content Millions of fat tests on milk me earned out evei> month in this count) v alone Dames, the Dan\ Held Im pioveinent \ssociation, and fed cial. slate and local conti ol agencies aic all inteiested in milk fat tests in oidei to estab lish the puce of milk shipments, to eca'uate con pcifoimance and to check whethei maiket milk has the leqimed minimum fat content Seveial decades ago milk used to be bought and sold by weight 01 volume alone But e\ei since Dr S M Babcock of the Wis consul Agucultmal Expenment Station developed and peifected a method foi the deieimination of the fat content of milk and cieam in 1890 the chemical fat test has become widely accepted ir Noith The Babcock test as it is gen ually letened to. is based on the digestive action of sulfuuc acid on the milk solids and the concomitant libeiation of all the fat m the milk sample Contn fugation causes this tat to be foi ced into the gi aduated nan ow poition of a standaidized milk test bottle wheie it can be meas uied The test is usually earned out or several samples at a time It is iauly easy, lequmng only some skill but stuct compliance with seveial details in the pioceduie, such as techniques, tempeiatmes and timings It takes about 20 minutes to determine the fat content of a milk sample by the Babcock method Sulfuuc acid is not particulaily expensive and the equipment and glasswaie may last many yeais if caied foi The Babcock test has been hail ed as one of the milestones in Ameucan milk and dauy histoiy An altei native to the Babcock method is the Gaibei test It was also developed in the 1890’s, but in Em ope, by the Swiss chemist Di N Geibei This test was in aoduced to this countiy about 15 yeais ago and has found wide acceptance in seveial states It is based on sinulai pi maples as the Babcock test, except foi vai lations in ceitain details Espe aally the testing equipment and glasswaie aic difteient Foi seveial vcais now, a new method toi the detei miration oi iat in milk has been gaining tention fiom the dan> indmtiv The method i orpin c-> an instil l ment developed and built b> a Danish fiim It is called the Idilk o Teslei and detcimines the iat peicenlage oi milk sample m about 30 seconds The deuce has been checked bj vauous people m ieseaich and induslual laboia tones ot seveial countnes, in eluding woikeis at the Pennsjl Vc,nia Agucultuial Expenment Station It is believed that the Milk-o Testei will levolutionue milk fat testing, especially foi such iou tine testeis as huge dames with inanj milk sluppeis and the slate Daily Held Impiovernent Associations Opeiating Pi maples The opaqueness ol milk is caused both by the piesence of colloidal i v disposed pi olein and fat glob ules naluially emulsified thiou ghoul the milk The fat and pio tem cause light to be dupa-cd and absoi bed When the milk piotun is dissolved, thus made invisible, and when the it noun mg fat globule a 15 pei cent foi milk testing 3 to 8 pei cent fat, that would be 006 pel cent fat foi a 4 pel cent milk and 0 075 pei cent toi a 5 pel cent milk Xoimallv. the Milk-o Testei is calibiated with milk samples of known fat content, as deteimm cd bv the Babcock test, the pie scntlv appio\ed and leciiinecl milk fat testing method Reproducibilitv of the instill ment is about the same as that ot othei fat testing methods Pi os and Cons Befoie moic icseaich is done with the Milko Testei it can onlv be accuiatelv u«ed foi unhomogenized. law oi pastuuzed, whole milk with a fat content of 2 to 6 per cent which, howevei covets piactical 1> all milk samples It is possi ble to test milk with a highei fat content oi cieam b\ diluting the sample so that a readable fat content is obtained Soui 01 e\en slightly sour, MORE FOR frames come 7 Because the panel js the builclmg-big, strong wall and roof panels tnat function as both cover and frame Panl Frame suits al most any farm need And you get a firescfc, weathersafe, practically maintenance free building to boot -one tnat won t sag or rot. 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Why not come in for some free Panl Frame building plans now 7 s.inipli’s may cause problems, be cause coagulated casein could plug the intake scicen or even the homogenizci Chemical pie seivalues can be used in sampl es without effect on the lesults o. danger of couosion Pioper calibration of the in stillment is extremely impoitant and the details of the insti notion must be adheicd to \pait from this opeiation of the Milk-o- Testei is fan ly easy Milk samples that have been chinned out dining transit should not be tested, as the re sults will always be below the ti ue fat peicentage Theie is no disposal problem as with sulfuuc acid, since the Veisene solution milk mixtuie is noncouosive The few existing publications dealing with woik on the Milk-o- Testei all praise its simplicity of opeiation, the speed with which lesults are obtained, the low cost per sample, provided a substan- They Look New; They Are New! li*i The new Butler grain bin—with wider body sheets, a broader corrugation and fewer parts—provides real savings and faster, easier erection. 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