Table 9 Parity distribution analysis
From: Low reproductive performance and high sow mortality in a pig breeding herd: a case study
% Litters | |||||
|---|---|---|---|---|---|
Parity | % litters Target | Oct 01- Feb 02 | July 02- Nov 02 | Dec 02- May 03 | Jun 03- Dec 03 |
1 | 20 | 18.9 | 12.0 | 12.5 | 12.1 |
2 | 18 | 23.3 | 10.4 | 10.5 | 9.7 |
3 | 17 | 21.8 | 18.1 | 10.1 | 9.2 |
4 | 16 | 12.2 | 21.5 | 15.1 | 11.6 |
5 | 14 | 7.8 | 16.3 | 19.3 | 16.6 |
6 | 10 | 7.6 | 8.7 | 13.8 | 16.7 |
7 | 4 | 3.0 | 7.8 | 7.2 | 10.6 |
8 | 1 | 3.1 | 3.7 | 5.8 | 6.5 |
>8 | 0 | 2.4 | 1.6 | 5.6 | 7.0 |
Whole herd | 100 | 100 | 100 | 100 | 100 |
GILT POOL (gilts available for service per 100 sows) | 12-151 | 4.8 | 4.8 | 4.8 | 7 |