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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

From: A 10-year trend in piglet pre-weaning mortality in breeding herds associated with sow herd size and number of piglets born alive

  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)
  1. aEs of year effects (SE) were obtained from statistical models. The models included the year effect only as fixed effects
  2. bThe statistical models were applied to square root-transformed values
  3. All estimates shown in the Table were found significant (P <  0.05) unless indicated as * (P > 0.05)