Answer:
This would be sexual reproduction and artificial selection.
The farmer would take the largest pigs to breed so they can both give their genes to their offspring which would then also most likely be large.
This can cause genetic mutations and diseases within the farmer's pigs.
Step-by-step explanation:
Sexual reproduction because you have 2 organisms in the process of pigs reproducing.
Since the farmer is picking and choosing which animals are breeding with each other, it would be artificial selection.