Kerala, India
Female pigs (sows) attain sexual maturity (puberty) at approximately 5 months of age and will display behavioral signs indicating receptiveness to breeding. Animals with slower growth rates or those receiving inadequate nutrition may reach puberty at a later age. Unmated sows will cycle into heat at 3-week intervals consistently throughout the year.
Making the Sow ready for Breeding
While most pig breeds achieve puberty at 5 months, certain breeds such as the Chinese pig may experience their first heat cycle as early as 3 months when provided with adequate nutrition and water. However, breeding should not occur during the initial heat period. It is advisable to wait an additional month, allowing the gilt to develop further before breeding. This delay ensures she will be physically capable of carrying and nursing a healthy litter effectively. Select only sows possessing 14 functional teats for breeding purposes to ensure sufficient nursing capacity for the entire litter. Unmated females will continue cycling every 21 days, provided nutritional and water requirements are met.
Signs of heat
A female pig entering the estrous cycle exhibits restlessness and may demonstrate reduced appetite. The vulva tissue becomes enlarged and develops a pink coloration. Applying firm pressure with both hands along either side of the sow’s back will cause her to stand motionless, indicating breeding readiness and willingness to accept the boar. The duration of standing heat ranges from 8 to 36 hours.
Bringing the Sow into Heat
Well-nourished, healthy sows can be induced into heat to enable controlled breeding management. Placing a sow exhibiting heat behavior among non-cycling females will often stimulate some of them to begin cycling. A more effective technique involves housing sows adjacent to a boar’s pen where they maintain visual and olfactory contact with him. Heat induction is particularly successful when using a mature, odorous boar. Keep in mind that failure to cycle can result from insufficient or poor-quality nutrition, or underlying health issues affecting the sow.
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