Amish raise and slaughter livestock to get meat. They also shop at stores for items that they want. They may buy their meat from stores as well as by raising their own.

Because it contains high energy and high protein making it an ideal feed to fatten up livestock prior to slaughter.

sh'chitah (שחיטה) = "slaughter" or "butchering," usually referring to kosher slaughter of livestock.

In common slang, it also can be used for describing an overly high price for a product. literally saying: "This is a slaughter!"

Roman butchers slaughtered livestock pretty much the same way as modern butchers. There were no religious rules about how animal should be killed.

Basically it made people more aware of the inhumane practices that were involved in the slaughter plants before Temple Grandin made the necessary improvements to make handling livestock and slaughter much more humane.