Humans don't make good farm animals. We take years to fully develop and over a decade to reach puberty (almost two decades if you want safer pregnancies). We're

Humans don't make good farm animals. We take years to fully develop and over a decade to reach puberty (almost two decades if you want safer pregnancies). We're omnivorous so feeding us will be more expensive (probably enriched corn/soy based meals) and over many more years. We're also not that big even if we were bred for size -- keeping stocky bulky humans with a good meat to fat ratio, discarding slender ones and fattier ones (unfortunately the same features that made my yoruba ancestors the stallions of the slave trade, would probably make us the wagyu of the Zondor haute cuisine). The Zondors must really like the taste of human meat if they think it's worth it. It also wouldn't work because if you have enough humans in one place under harsh conditions, rest assured a rebellion is in order.