> 1 kg of meat requires 2.8 kg of human-edible feed for ruminants and 3.2 for monogastrics
https://www.sciencedirect.com/science/article/abs/pii/S22119...
As for fertilizer, the usage is lower without animal agriculture even compared to best case usage of manure
> Thus, shifting from animal to plant sources of protein can substantially reduce fertilizer requirements, even with maximal use of animal manure
https://www.sciencedirect.com/science/article/abs/pii/S09213...