With parity segregation farms are built where the gilts/first parity sows and their offspring are housed on a separate flow. Pregnant multiparity sows move to different farms once confirmed in pig.
The advantages of separating the young sow herd from the main herd include, enhanced biosecurity pregnant 2nd parity sows can be retained at the gilt unit until any health issue is resolved, reduced medication costs – as the more vulnerable pigs are separated from the main group and enhanced personal management – where the more specialized jobs – mating and farrowing gilt litters can be concentrated on one farm rather than be spread around multiple production units, even pig flow and enhanced production from the multiparity farms.
A model of the system can be illustrated below based on a weekly batch farrowing place farm of 100 per week producing 1200 weaners per week or 62400 annually.
The weaned 1st parity sows are mated (now 2nd parity) and held at the gilt farm until confirmed in pig. After a review of the numbers confirmed pregnant at each of the sow farms the pregnant sow requirements are stablised from the pregnant 2nd parity sows. Ideally each of the sow farms should aim for 110% of the batch farrowing place requirement.
The gilt unit can wean at 4 weeks of age whereas, assuming it is legal, the sow units can wean at 3 weeks.