Table 4.
Production and fertility parameters recorded in the SPF-herd during 1990–2000a
| Year | Production parameters |
Fertility parameters |
|||||||
| Farrowings (n) | Live piglets (per litter±S.D.) | Stillborn (per litter±S.D.) | Deaths pre-weaning (per litter±S.D.) | Small litters (%) | Matings (n) | Repeat breeders, 18–24 days (%) | Repeat breeders abnorm interval (%) | Non-pregnant or abortions (%) | |
| 1990 | 45 | 10.9 ± 2.7 | 0.7 ± 1.2 | 1.3 ± 1.3 | 2.2 | 46 | 10.9 | 2.2 | 8.7 |
| 1991 | 48 | 10.5 ± 2.9 | 0.9 ± 1.2 | 1.5 ± 1.4 | 6.3 | 77 | 7.8 | 1.2 | 5.2 |
| 1992 | 57 | 11.2 ± 2.4 | 0.7 ± 1.0 | 1.4 ± 1.6 | 0.2 | 60 | 5.0 | 0 | 1.7 |
| 1993:1b | 13 | 12.5 ± 2.3 | 0.5 ± 0.5 | 1.6 ± 1.4 | 0.0 | 20 | 5.0 | 5.0 | 25.0 |
| 1993:2b | 10 | 11.1 ± 4.4 | 1.4 ± 1.1 | 2.6 ± 3.8 | 20.0 | 16 | 0 | 0 | 18.8 |
| 1993:3b | 16 | 10.1 ± 4.0 | 0.7 ± 1.1 | 1.1 ± 1.2 | 6.3 | 12 | 0 | 0 | 25.0 |
| 1993:4b | 10 | 10.8 ± 3.6 | 0.8 ± 1.1 | 1.0 ± 1.5 | 10.0 | 13 | 23.1 | 0 | 0 |
| 1994 | 55 | 12.1 ± 3.1 | 0.7 ± 1.1 | 1.3 ± 1.4 | 3.6 | 68 | 8.8 | 0 | 0 |
| 1995 | 60 | 11.7 ± 3.4 | 0.8 ± 1.2 | 1.4 ± 1.5 | 5.0 | 60 | 5.0 | 0 | 0 |
| 1996 | 72 | 11.2 ± 3.0 | 1.1 ± 1.3 | 1.3 ± 1.2 | 4.2 | 91 | 5.5 | 0 | 0 |
| 1997 | 98 | 11.5 ± 2.6 | 0.9 ± 1.1 | 1.4 ± 1.7 | 1.0 | 124 | 4.8 | 0 | 1.6 |
| 1998 | 118 | 11.1 ± 3.0 | 1.0 ± 1.3 | 0.9 ± 1.1 | 5.9 | 149 | 8.1 | 0.7 | 2.6 |
| 1999 | 153 | 11.4 ± 3.2 | 0.9 ± 1.4 | 1.2 ± 1.1 | 6.5 | 168 | 4.2 | 1.2 | 0.7 |
| 2000 | 135 | 11.5 ± 3.4 | 1.3 ± 1.8 | 1.2 ± 1.4 | 6.7 | 151 | 4.6 | 0 | 1.3 |
a
For details on the definition of production and fertility parameters, see Section 2. Due to the sale of pregnant animals the number of matings may occasionally exceed the number of farrowings.
b
The results for 1993 are given quarterly.