Table 1 Reproductive performance of sows in 155 herds
Measurements | n | Mean | SEM | Median (IQR) |
|---|---|---|---|---|
Lifetime records | ||||
Age at first-mating | 126,598 | 254.4 | 0.11 | 249 (235–273) |
Number of parity at removal | 144,052 | 5.5 | 0.01 | 6 (4–7) |
Reproductive herd life days | 144,052 | 834.1 | 0.86 | 882 (573–1098) |
Lifetime piglets born alive | 144,052 | 68.0 | 0.09 | 71 (42–93) |
Lifetime non-productive days | 144,052 | 74.1 | 0.14 | 57 (34–101) |
Annualized lifetime piglets born alive | 144,052 | 28.7 | 0.02 | 29 (25–33) |
Annualized lifetime piglets weaned | 144,052 | 25.4 | 0.01 | 26 (23–28) |
Parity records | ||||
Served parity | 691,276 | 3.4 | 0.01 | 3 (2–5) |
Weaning-to-first-mating interval, days | 691,276 | 5.9 | 0.01 | 5 (4–5) |
Farrowing rate, % | 691,276 | 87.5 | 0.04 | – |
Number of subsequent piglets born alive | 647,814 | 12.5 | 0.01 | 13 (11–15) |
Parity 1 records | ||||
Lactation length, daysa | 141,471 | 23.8 | 0.01 | 23 (21–26) |
Number of piglets weaneda | 141,471 | 11.0 | 0.01 | 11 (10–12) |
Weaning-to-first-mating interval, days | 144,052 | 7.3 | 0.01 | 5 (4–6) |