There are many measures to promote ovulation in sows. The following are commonly used:
1. Boar Stimulation: Boar stimulation includes visual, olfactory, auditory, and physical contact. These stimuli have a large role in promoting ovulation in sows. The stimulatory effects of boars and adult boars are greater than those of young boars and poor boars. The sows to be bred should be housed in a column adjacent to the adult boar, allowing the sow to receive the boar's form, odor and sound stimulation. Daily sow adult boars chase sows for 10–20 minutes in the sows to be bred. These can allow the sow to be in direct contact with the boar, and can also play a role.
2. Appropriate stimuli: Mixing and repelling exercise is a stress for sows, which is beneficial to early estrus. Due to proper stimulation, the sow body excitability can be increased. After weaning empty sows and sows that are not pregnant or showing estrus after mating, it is best to have 4-5 polycultures per pen, but pay attention to the difference between age and weight not too large, and do not put fertile sows Mixed with docile sows so as not to fight too intense, causing disability or even death. There is a kind of pig farm, it is best to have a certain amount of time every day to properly drive empty sow movement. After such appropriate stimulation, some sows in estrous state will re-express estrus.
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