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Table 3 Comparisons of performance measurements (Means and SEM) between two herd size and 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

 Productivity groups 
Herd size groupsOrdinary herdsHigh productivity herds
 Small-to-mid farms37,74314,522
 Large farms41,85141,749
Herd-life annualized piglets weaned, pigs
 Small-to-mid farms23.5 ± 0.2 b,y27.1 ± 0.3 a
 Large farms24.5 ± 0.3 b,x26.9 ± 0.3 a
Herd-life nonproductive days
 Small-to-mid farms95.0 ± 2.3 a,x66.9 ± 4.7 b
 Large farms77.1 ± 4.6 y67.2 ± 5.1
  1. 1Means and SEs were estimated by the models
  2. a,b Different superscripts within a row represent significant differences in means (P < 0.05)
  3. x,y Different superscripts within a column represent significant differences in means (P < 0.05)