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Table 4 Average age-related and litter production of 35,847 gilts

From: Utilization and reproductive performance of gilts in large-scale pig farming system with different production levels in China: a descriptive study

  High-performing pig farms (n =26) Low-performing pig farms-Total pigs (n =26) Low-performing pig farms-Breeding pigs (n = 22) Low-performing pig farms-Commercial pigs (n = 18)
Mean ± SEM Mean ± SEM Mean ± SEM Mean ± SEM
Number of gilts 11,833 24,014 10,952 13,062
Introduction age 201 ± 0.46a 210 ± 0.25b 208 ± 0.38c 211 ± 0.34d
Age at first estrus 242 ± 0.42a 252 ± 0.28b 249 ± 0.34c 254 ± 0.42d
Age at first mating 255 ± 0.38a 253 ± 0.28b 250 ± 0.35c 255 ± 0.42a
Total number of piglets born per litter 11.8 ± 0.02a 9.7 ± 0.02b 9.9 ± 0.03c 9.6 ± 0.02d
Number of piglets born alive per litter 11.0 ± 0.02a 8.7 ± 0.02b 8.9 ± 0.03c 8.6 ± 0.03d
Number of weaned piglets per litter 9.3 ± 0.04a 7.1 ± 0.03b 7.0 ± 0.03c 7.3 ± 0.03d
  1. a,b,c,d Bars with different letters differ significantly (P < 0.05)