Viv,
Working in the animal trade has never been easy and required a strong stomach. My uncle, Jack Whitelam, was for many years a pig slaugterman for Marsh & Baxter, and my great uncle, Garibaldi Sedgwick, in his early working life was a currier, as I have detailed elsewhere on the Forum. Both told some fairly horrific stories although neither were cruel men.
Nevertheless, I'm sure that the animals suffered far less than the cattle at an abbatoir/processing plant in north eastern Pennsylvania, where cattle reputedly went from live animal to fully processed product in one minute and fifty seconds. The company concerned had a volume contract with the Japanese for quality beef and most of the rest ended up as pet food.
Maurice