Table 1 Means (standard deviation) in four selected years (2007–2016), and estimates (Es) a of year effects (standard error: SE) on pre-weaning mortality and related performance measurements
Year | Year effect (Y) | |||||
|---|---|---|---|---|---|---|
Y | Y x Y | |||||
Measurement | 2007 | 2010 | 2013 | 2016 | Es (SE) | Es (SE) |
Piglets born alive | 11.2 (0.83) | 11.7 (0.87) | 12.2 (0.85) | 13.1 (1.06) | 0.0758 (0.0236) | 0.0107 (0.0019) |
Stillborn piglets | 1.03 (0.56) | 1.04 (0.50) | 1.02 (0.49) | 1.04 (0.51) | −0.0174* (0.0100) | 0.0021 (0.0008) |
Piglets weaned | 9.8 (0.68) | 10.2 (0.68) | 10.6 (0.68) | 11.3 (0.91) | 0.0433 (0.0204) | 0.1954 (0.0068) |
Pre-weaning mortality, % | 11.9 (4.08) | 12.8 (3.49) | 13.0 (3.66) | 13.1 (3.19) | 0.3304 (0.1103) | −0.0194 (0.0091) |
Age at piglet death, daysb | 2.5 (3.97) | 3.2 (4.14) | 4.8 (4.24) | 5.6 (5.12) | 0.1506 (0.0493) | 0.0012* (0.0038) |
Piglets weaned per sow per year | 22.2 (2.88) | 23.9 (2.22) | 24.5 (2.36) | 26.4 (2.96) | 0.1882 (0.1029) | 0.1954 (0.0068) |
Sow herd size | 742 (723) | 816 (761) | 873 (764) | 957 (830) | 0.2349 (0.1111) | 0.0155 (0.0079) |