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Producing soya beans is responsible for some significant amounts of deforestation in tropical areas and relying on soya introduces a demand for transportation in countries where soya is not grown.

I know that soya is used as a feed for livestock. I don't know the statistics for dairy livestock, but an advantage of cows is that they can produce food from local land which is only able to support grass but not crops, and they produce manure.

Question is how much soya, if any, is typically used in developed countries to produce a glass of ordinary full-fat/semi-skimmed milk? How do more developed compare with less?

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    Seems to be little in the UK – EnergyNumbers Jan 30 '18 at 8:13
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    A pedantic answer could be that no soya is required to make milk. – Jean-Paul Calderone Jan 30 '18 at 21:20
  • Agreed, but theory does not always match practice. Shops do not label their products with the specifics of what feed was used for good reason as the complexity would be overwhelming. – Arty Feb 1 '18 at 9:00
  • Anyone have any ideas for countries other than the UK e.g. US or developing nations? – Arty Feb 1 '18 at 9:01
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To summarise @EnergyNumbers's response which applies for UK milk, I will quote a section from the report he linked:

"Between 60 and 112 litres of milk produced for each kilo of soya meal fed to cows, 7.5 litres of milk produced from each kilo of soya beans turned into soya milk"

The report points out that the UK has a better climate for grass (read rainy), and that there are some farmers who produce pasture-only or avoid use of soya in their feeds. Other reasons to avoid soya are the use of Roundup which is a listed carcinogen, the use of nickel and hexane as solvents in the production of soya oil for livestock feeds.

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