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 - The River Tractor - by Charlie English Jr.. This is a 4010 John Deere that was used to farm on the Diamond Island which is in the Ohio River about 15 miles southwest of Evansville, Indiana. About ten years ago, this tractor was parked close to the bank as the river was washing the bank of the island away.
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