Herd data | Herd 1 | Herd 2 | Herd 3 | Herd 4 |
---|---|---|---|---|
Study period | January 2011 | March 2011 | May 2011 | July 2011 |
Herd size (number of sows) | 900 | 1250 | 700 | 950 |
SPF1-status | Not declared | Not declared | SPF+AP12 | SPF |
Piglets weaned/sow/year2 | 30.7 | 27.1 | 25.4 | 32.3 |
1st parity litters (%)2 | 20 | 22 | 21 | 23 |
Recruitment of gilts | Purchase | Own production | Purchase | Own production |
Sow feed3 | Wet/ Home made | Wet/ Home made | Wet/ Home made | Wet/ Factory made |