Yes. Easy.
The complexities come if you direct market.
We sell direct to our local abattoir keeping one porker from every litter and produce two litters twice a year.
Abattoir check animals a week or two before they are ready and ask if they want higher/lower weight and we adjust feed as needed. They charge £10 to collect each animal, deducted from killed-out cost. We have never had a problem, are paid by transfer within two or three days of slaughter.
LB's are not paid for above the norm but are always taken. Our local abattoir is certified for organic slaughter and the animals are received and processed quickly, quietly and cleanly.