Soy. I wrote soy exports. Not "beef production exports".

Brazil (with Argentina) is main soy exporter for most of the worlds livestock.

In the documents below you can find clear numbers of how much hectares is used for pasture, corn, soybean etc. and how much stays forest.

The cause of that deforestation is clear, it is soybean + corn + beef = animal agriculture. Brazil has one of the highest rates of deforestation in the world.

http://documents.worldbank.org/curated/en/758171468768828889...

https://openknowledge.worldbank.org/bitstream/handle/10986/1...