General sows start estrus within 4-5 days after weaning, at which point they can breed. Observe the estrus of the sow and determine the timing of breeding. Use the boar in the morning and evening. When the sows’ libido declines or stops completely, people are more likely to get close to the sow and press harder on the sow's back, the sow is still, both ears stand upright, and the tail lifts upwards; when the sow is in heat, the boar approaches it. The sows will be tempted by their tails, giving out special calls or irritatingly walking back and forth in the pig house, urinating frequently, willing to approach boars for mating, and sometimes pigs and pigs will cross over each other.
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