♦ The sows should stay in the same housing until the first ultrasonic test.
♦ To minimize stress in a critical time — Implantation of the egg cell into the uterus.
♦ Even little stress can lead to coming back into heat
♦ Gilts should be separated from old sows.
♦ Control for signs of heat after 21 and 42 days (with an adult boar).
♦ With good management you can find sows, which return to heat until the 21st day of pregnancy. 90% of all sows back in heat in the respective group must be found by day 21.
♦ Pregnancy test (Ultrasonic test) after 28 days. Sows without a clear result should be tested one week later again.
♦ Only clearly pregnant sows are moved to group pens after the 4th week of gestation. Questionable sows remain in individual pens and are tested again with an ultrasound device after another week.
♦Non pregnant sows have to be removed immediately from their group. Based on the date of the next likely date of farrowing, the sow will be transferred to the corresponding week group.
♦ In the group pens, too, attention is paid to those sows which could return to heat, on a daily basis. Sow groups which are pregnant for 42 days are intensively observed on day 40, 41, 42 and 43 post A.I twice a day for possible signs of heat.
同样，在待产舍的群养栏中也必须每天关注是否出现返情母猪。对配种后 42天的母猪要额外关注是否有发情迹象，对此要 在第40、41、42和43天每天观察两次。
Anyone in the pen, regardless of their function, must immediately note and mark any sow, which returns to heat and immediately notify the responsible person.
♦ After 4 weeks （28 days） the sows can be moved to the waiting pen in group housing. The sows remain in their groups until about 3 to 4 days before farrowing.
The following measures must always be carried out consistently:
♦ The date of insemination is recorded on the sow card.
♦ The date for the control for signs of heat at 21 days and 42 days is calculated at the time of insemination and also recorded on the sow card.
♦ The farrowing date is calculated and noted on the sow card.
♦ The sows are always together on the farm per insemination week, because this enables effective control.
♦ Even after insemination, as long as the sows are standing in individual pig pens, the control for signs of heat is carried out twice a day, always at fixed times (30 min. after feeding) with a boar. One boar is required for 150 sows.