I really can't say for ~sure~ that there aren't ~any~ preservatives in the milk today, but I'm fairly sure that there isn't. The main reason milk keeps so long today is because of fast, controlled refridgeration moments after it leaves the cow until it reaches your hands. It's cooled to under 4 degrees C within 1/2 hour of milking, stays that way until it's pasturized when any bacteria are killed, then it's quickly chilled again. 40-50 years ago there was little or NO refridgeration... at least around here. Milk was shipped in cans here until 1971. They had water chillers for the cans... but there's only so much that was going to do. 4 deg C is considered a critical control point for milk in the HAACP protocols that are followed today in the plants and on farm. Basically... if milk is kept cooler than 4 deg C, then bacterial growth is basically inhibited. That and fairly strict control of somatic cell counts (mastitis) give milk a long shelf life.
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Today's Featured Article - Tractor Profile: Allis-Chalmers WD45 (Gas Version) - by Staff. Beginning production in 1953, the WD45 had the same general look as the WD tractor which was produced earlier - but was much more powerful. This was due to the new 4-cylinder "Power Crater" gasoline engine with a 4 x 4-1/2 inch bore and stroke. Some people feel this was one of the most significant tractors offered by Allis-Chalmers in those days. Nothing in its weight or power class could match its performance. In 1954 they began offering the WD45 with the new "Snap-Coupler&quo
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