Herds with a high PPSY tend to have a higher average parity, lower sow mortality, more than two matings/service, and a preweaning mortality of less than 14%.
HERD PROFILE FOCUS IMPROVEMENTS ON All herds Lower wean age, increase average parity and matings/service Low PPSY Breeding techniques: Farrowing rate and nonproductive days Medium PPSY Breeding techniques: Farrowing rate and nonproductive days Litter size High PPSY Breeding techniques: Farrowing rate and nonproductive days Litter size Preweaning mortality
Modern pig production units should wean at least 22 PPSY.
The four main factors that contribute to PPSY are litters per sow per yr, total pigs born, stillborn rate, and preweaning mortality.
With 12 pigs born and low preweaning mortality and low stillborn rate, the farm can wean over 25 PPSY.
0 stillbirths, the farm that has 14 pigs born will wean over 27 PPSY.
Realistic goals for attaining high PPSY records in a herd are: nonproductive days, <60; weaning age, <24 d; farrowing rate, >80%; litter size, >10.
How many more weaned pigs would be produced on a 1,000-sow unit by lowering the preweaning mortality of a farm doing 20 PPSY with a 15% (or average) preweaning mortality of 7.
Provide some example target values for number of pigs born total and born alive, stillbirth rates, and preweaning mortality for a herd that weans 24 PPSY.
TABLE 18-1 Example Farms That Reflect a Range of Productivity From Poor to Good and the Effects on PPSY (pigs weaned per sow per yr).