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 - Women and Tractors - More Views From the Farmer's Wife - by Teri Burkholder. The top ten reasons why the judges wouldn't let you participate in the stock antique tractor pull: Hey, this is stock! It came with that V8 in it! That "R" on my tires stands for "really old" not radial! Blue gas? We thought it was a pretty color! What wire hooked to my throttle?
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