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Historically, skimmed milk was used for fattening pigs, and was recommended as "not only the very best supplement for growing pigs, but is of almost equal value for fattening purposes" as it "furnishes a complete protein" and makes the feed "more palatable".
- Whole milk (around 3.0–4% fat) – Plastic bottles marketed in blue packaging.
- Semi-skimmed milk (around 1.8% fat) – Plastic bottles are marketed in green packaging.
- Skimmed milk (around 0.1% fat) – Plastic bottles are marketed in red packaging.
- Channel Island milk (around 5–5.5% fat) Often referred to as gold top, although this varies.
- 1% fat milk – Normally sold in purple or orange packaging.
In the UK milk is sometimes still delivered by milkmen, it can delivered on the doorsteps by a milkman in the early hours of the morning in glass pint bottles with the color printed foil lid indicating the milkfat content. Whole milk had plain silver foil, semi-skimmed milk had silver foil with red stripes and skimmed milk silver foil with a blue checker pattern.
- Whole milk is 3.5% fat
- 2% Reduced-fat milk
- 1% Lowfat milk
- 0% Non-fat milk (also called skimmed milk or fat-free milk)
United States milk producers also use a color-coding system to identify milk types, usually with the bottle cap or colored accents on the packaging. Whole milk is almost universally denoted by red, while 2% is most often colored royal blue. 1% and skim colors vary by region or dairy, with common colors for these lines being purple, green, yellow, pink, or light blue.
- "CFR – Code of Federal Regulations Title 21". accessdata.fda.gov. USA: Federal Drugs Administration.
- Ward, Andrew (23 May 2017). No Milk Today - The vanishing world of the milkman (1st ed.). London: Robinson. ISBN 978-1472138903.
- Oliver, A. W.; Potter, E. L. (November 1930). "Fattening Pigs for Market" (PDF). Agricultural Experiment Station Bulletin (269): 14. Retrieved 21 November 2012.
- "How Is Skim Milk Made?". Kitchn. Retrieved 2021-02-16.