The impact of semen used for post-cervical AI is 2-3 times bigger than that used to produce cervical insemination doses; therefore, preparation of the doses should follow an even stricter control program.
Boar exposure time, duration and frequency, proper boar: gilt or sow ratio, exposure methods, hormones, …
This tool allows prediction of potential ejaculate yield and to aid in diagnosing subfertility/infertility associated with diseased tissues.
Sows with more than 16 piglets Total Born (TB) per litter have twice as many stillbirths (SB) as those with 13 to 16 TB litters, and three times more SB than sows farrowing litters smaller than 13 TB.
The animals that were retained several times throughout the flow originated from sows with lower average parity. They had a much lower carcass weight (around 10kg) and a higher average score for lameness, pleurisy and enzootic pneumonia lesions.
We recommend that producers pay more attention to gilts and sows that are at risk of increasing NPD. Situations of increased risk are described.
This second part deals with the problems caused by not recording properly the cause of abortions, sows and piglets deaths, nurse sows and hormonal treatments.
This first part deals with backward and impossible data, i.e. the sows that are no longer in the farm but still appear both in the management softwatre and the 100% delivery rates in gilts.