Table 1 Descriptive statistics for the performance characteristics of the commercial farms included in the study (N = 623)
From: The impact of herd age structure on the performance of commercial sow-breeding farms
Mean | Standard deviation | Percentiles | |||
|---|---|---|---|---|---|
25 | 50 | 75 | |||
Mean number of sows on the farm | 1426.13 | 1217.06 | 561.64 | 983.11 | 2057.64 |
Replacement rate (%) | 47.31 | 13.10 | 40.19 | 45.78 | 52.76 |
Number of piglets weaned per sow per year | 29.73 | 3.44 | 27.47 | 29.47 | 32.04 |
Culled sow age (months) | 32.75 | 4.61 | 30.10 | 32.62 | 35.11 |
Farrowings per culled sow | 4.55 | 0.90 | 4.05 | 4.57 | 5.06 |
Total number of piglets weaned per culled sows | 54.73 | 11.99 | 47.66 | 54.80 | 61.50 |
Farrowings per sow and year | 2.43 | 0.08 | 2.40 | 2.44 | 2.48 |
Farrowing rate (%) | 84.62 | 5.74 | 81.54 | 85.34 | 88.29 |
Percentage of sows return to oestrus | 13.95 | 5.58 | 10.27 | 13.02 | 17.13 |
Weaning-to-first-service interval (WSI, days) | 6.17 | 1.75 | 5.20 | 5.72 | 6.58 |
Weaning-to-oestrus interval (WOI, days) | 4.90 | 0.73 | 4.49 | 4.80 | 5.15 |
Weaning to conception interval (WCI, days) | 9.37 | 3.40 | 7.25 | 8.65 | 10.48 |
Number of piglets total born (TB, per litter) | 15.63 | 2.01 | 14.16 | 15.08 | 17.33 |
Number of piglets born alive (BA, per litter) | 14.30 | 1.71 | 13.06 | 13.89 | 15.79 |
Number of piglets still born per litter | 1.33 | 0.48 | 1.02 | 1.27 | 1.59 |
Number of piglets weaned per litter | 12.22 | 1.36 | 11.21 | 12.06 | 13.15 |
Mortality rate of BA piglets at weaning (%) | 14.41 | 4.53 | 11.57 | 14.08 | 17.33 |
Mortality rate of TB piglets at weaning (%) | 18.41 | 6.97 | 12.58 | 19.10 | 23.55 |