This is very interesting! I think one of the most important things here is how much suffering there was of the animals. (Still, I'm also very unsure that less people would mean less consumption would mean less animals suffering.) There's a rethink priorities article about animal farming in Zambia! The video of the chickens did not seem as extreme (extreme as in horrific) as other things I've read about in places like the U.S.

 https://rethinkpriorities.org/publications/what-is-animal-farming-in-rural-zambia-like