On: How many animals get slaughtered every day?

[defrost]

This is transformed data most likely aggregated and unit converted from:

https://www.fao.org/faostat/en/

which facilitates bulk data downloads in XML | JSON and additional hosts a BETA data explorer interactive web front end:

https://dataexplorer.fao.org/

I have no opinion on the accuracy of the article linked, had I the time ATM I'd work through this myself (as I often do for all manner of things).