Table 1.
Comparison of technical-economic results from sampled herds with reference population.
| Criteria | N* | Sample mean value | s.d. | Population mean value† | P value‡ |
|---|---|---|---|---|---|
| Number of sows present | 90 | 321 | 227 | 230 | <0·001 |
| Post-weaning daily weight gain (g) | 49 | 493 | 58·59 | 473 | 0·01 |
| Fattening daily weight gain (g) | 53 | 763 | 148·5 | 784 | 0·85 |
| Post-weaning technical feed conversion ratio (kg/kg) | 48 | 1·7 | 0·3 | 1·69 | 0·27 |
| Fattening technical feed conversion ratio (kg/kg) | 56 | 2·9 | 0·3 | 2·83 | 0·20 |
| Post-weaning mortality (%) | 55 | 2 | 1·4 | 2·1 | 0·51 |
| Fattening mortality (%) | 60 | 4 | 4·2 | 3·6 | 0·21 |
| Nursery final age (days) | 57 | 67 | 16·8 | 75 | 1·00 |
| Fattening final age (days) | 60 | 174 | 25·0 | 184 | 1·00 |
| Weight at nursery entrance (kg) | 57 | 7 | 2·9 | 7·1 | 0·26 |
| Weight at fattening entrance (kg) | 57 | 35 | 27·0 | 31·4 | 0·18 |
| Fattening final weight (kg) | 58 | 118 | 11·6 | 115·7 | 0·05 |
| Number of slaughter pigs produced/year | 63 | 6863 | 13 918 | 4665 | 0·10 |
| Number of piglets born alive/litter | 64 | 13·3 | 0·7 | 13·1 | 0·02 |
| Number of piglets weaned/litter | 63 | 11·4 | 25·3 | 11·4 | 0·55 |
| Replacement rate (%) | 60 | 41·5 | 9·3 | 40 | 0·11 |
*
Number of sampled farms considered for each variable.
†
Results for 2009 Brittany population [33].
‡
Test of comparison between an observed and a theoretical mean (95% Z test).