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Table 2 Comparisons of performance measurements (Means and SEM) between two herd size and between two productivity groups1

From: Increased age at first-mating interacting with herd size or herd productivity decreases longevity and lifetime reproductive efficiency of sows in breeding herds

 Herd size groupsHerd productivity groups
MeasurementsSmall-to-mid herdsLarge herdsOrdinary herdsHigh productivity herds
 n102,52844,66699,68047,514
 Age at first-mating264 ± 4241 ± 8241 ± 6264 ± 7
Longevity
 Number of parity at removal5.17 ± 0.104.88 ± 0.125.01 ± 0.095.03 ± 0.13
 Sow life days1056 ± 14 a998 ± 19 b1038 ± 141017 ± 19
 Sow herd-life days801 ± 14 a743 ± 18 b783 ± 14762 ± 19
 n83,60052,26579,59456,271
Prolificacy
 Herd-life piglets born alive69.2 ± 1.266.0 ± 1.565.0 ± 1.2 b70.2 ± 1.6 a
 Herd-life piglets weaned60.0 ± 1.058.0 ± 1.256.5 ± 0.9 b61.5 ± 1.3 a
Reproductive efficiency
 Sow life annualized piglet weaned18.8 ± 0.218.7 ± 0.217.7 ± 0.1 b19.8 ± 0.2a
  1. 1Means and SEs were estimated by the models
  2. a,bDifferent superscripts within a row represent significant differences in means (P < 0.05)