Farrowing farms produce and raise piglets. Four months after insemination, breeding sows will deliver 8-12 piglets. These piglets are weaned after two weeks and moved to nurseries. In about 10 weeks they are raised to approximately 25 kg. After weaning, sows are moved to sow pens or crates to prepare them for insemination again after three to five days. Farrowing companies usually have one or two boars to detect which sows can be inseminated. It is important to inseminate at a specific time because the oestrous period does not last very long. On farrowing farms, male piglets are castrated in the first week of their life, to prevent so-called boar taint of pork meat.