Slaughter implies killed in an abattoir then processed into meat products. All a very controlled process following strict animal welfare and hygiene guidelines in order that the suffering of the animal is minimal.
Culled implies the most humane method of killing the animals but outside of the strict abattoir rules, therefore the resulting carcass is destroyed and the animal was reared and killed for no benefit.
I see, I visited an abattoir 60 odd years ago, Dad was a butcher, all I saw for cattle, sheep and pigs was a stun gun.
Given the changes in various practices in the Covid emergency, it seems strange seems odd that similar changes can’t be made here.
Perhaps the produce could be sold at 1/11d per pound…..