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Table 3 Average first mating information of 97,998 mating out of 112,157 gilts in 1540 gilts’ batches

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) Intermediate-performing pig farms (n = 53) Low-performing pig farms (n = 26)
Mean ± SEM Mean ± SEM Mean ± SEM
Number of gilts' batches 235 948 357
Total number of mating 19,819 43,867 34,312
Mating rate at first estrus1 54.9% ± 2.6%a 74.6% ± 1.2%b 63.9% ± 2.1%c
Mating rate at second or more estrus2 18.4% ± 1.9%a 2.6% ± 0.4%b 1.9% ± 0.5%b
Mating rate under 135 kg3 12.8% ± 1.7%a 20.0% ± 1.2%b 7.3% ± 1.2%ac
Mating rate between 135 and 145 kg4 47.9% ± 2.5% 50.6% ± 1.5% 50.5% ± 2.2%
Mating rate above 145 kg5 12.6% ± 1.6%a 6.6% ± 0.7%b 7.9% ± 1.3%b
Mating rate under 210 d6 7.2% ± 1.2%a 8.9% ± 0.8%a 13.6% ± 1.6%b
Mating rate between 210 and 240 d7 24.6% ± 1.9% 23.5% ± 1.2% 23.3% ± 2.0%
Mating rate above 240 d8 41.5% ± 2.3%a 44.8% ± 1.4%a 28.9% ± 1.9%b
Total average mating rate9 73.3% ± 2.2%a 77.2% ± 1.2%a 65.8% ± 2.1%b
Average times of estrus at first mating 10 2.4 ± 0.96a 0.9 ± 0.03b 1.2 ± 0.26b
Average age at first mating11 216 ± 5.99a 224 ± 3.21b 213 ± 5.33ab
  1. 1Mating rate at first estrus = Number of mating at first estrus/Total number of mating
  2. 2Mating rate at second or more estrus = Number of mating at second or more estrus/Total number of mating
  3. 3Mating rate under 135 kg = Number of mating at weight under 135 kg/Total number of mating
  4. 4Mating rate between 135 and 145 kg = Number of mating at weight between 135 and 145 kg/Total number of mating
  5. 5Mating rate above 145 kg = Number of mating at weight above 145 kg/Total number of mating
  6. 6Mating rate under 210 d = Number of mating at age under 210 days/Total number of mating
  7. 7Mating rate between 210 and 240 d = Number of mating at age between 210 and 240 d/Total number of mating
  8. 8Mating rate above 240 d = Number of mating at age above 240 d/Total number of mating
  9. 9Total average mating rate = Total number of mating/Total number of introduction
  10. 10Average times of estrus at first mating: Average times of estrus at first mating in each gilts’ batch
  11. 11Average age at first mating: Average age of gilts at first mating in each gilts’ batch
  12. a,b,cBars with different letters differ significantly (P < 0.05)