I found this little gif interesting. Is this humane slaughter? It’s certainly extremely efficient.
Research to find the cartoon’s title tells me that this animation comes from an episode called “I Eats My Spinach”, which involves Popeye briefly engaging in a bullfight, with the ending pictured above. However, the same research also leads to a synopsis of an episode called “Bulldozing the Bull” where Popeye refuses to attend a bullfight on ethical grounds — “It’s cruelty to aminals” — and later befriends the bull.
Nothing profound here, just a little glimpse of something. Also, the one cut of kosher meat intrigues me.
Animalfeasance 
The kosher meat comes from the fact that the Max Fleischer studios were known as “the Jewish Studio” in those days. Probably the owner(s) and maybe many others were Jewish. Lots of Hebrew references in the Fleischer cartoons.