The high percentage of gestation and high percentage of farrowing are not the same. Percentage of gestation above 96% can be attributed to high pregnancy, which is already known in the 28th day of pregnancy. The percentage of farrowing is most often 3-4 percent lower.
Percentage of farrowing above 93% counts as good, making it a yearly basis is a very good result. The high percentage of farrowing attracts the high pig number, which can only be achieved by good management.
One of the most important factors of high birth rates is the sow condition, which can be accurately determined by backfat measurement. Regular backfat measurement helps to check the condition of our sows, and if there is something to be fixed. It is therefore advisable to conduct multiple measurements from insemination to fertilization. The most common measurement times are: at weaning, at the time of 4 weeks old pregnancy, 8 weeks old pregnancy, and when we move them to the farrowing station.
The appropriate backfat thickness is the average of the two measurements (P2). It does not matter if a gilt loses the same amount of backbfat as the sow, during a lactation. One mm back fat is 7-8 kg body weight. Thinking in percent, there is a 300 kg sow with a 19 mm backfat thickness and we have a 250 kg gilt with a 19 mm backfat thickness. Both of the lose 4 mm backfat during the lactation, but in terms of percentage, the 300 kg sow lost about 10% of body weight while the 250 kg gilt lost 12%. This 2% excess weight loss is quite enough to exhaust the body's inventory - capsizing the balances. The rapid condition loss affects the next cycle from insemination to farrowing and has a negative influence on the period of oestus- conseption. For gilts, it is important that the thickness of the backfat is adequate (14 mm) since our goal is as many piglets as possible (over 16 pigs).