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Table 1 Descriptions of productive performance between total pig farms and top 5% pig farms

From: Study on the influence of different production factors on PSY and its correlation

 

Mean

Median

Minimum

Maximum

SD

Total pig farms (n = 603)/Top 5% pig farms (n = 29)

Total number of piglets per littera

11.3/12.1

11.4/12.2

9.0/10.0

14.9/14.9

1.0/0.9

Number of piglets born alive per litterb

10.4/11.5

10.4/11.5

7.5/9.4

14.1/14.1

1.0/0.9

Number of weaned piglets per litterc

9.4/10.5

9.4/10.4

6.8/9.0

12.4/12.4

1.0/0.6

Farrowing rate (%)d

78.2/87.4

81.2/88.5

36.6/58.5

99.2/99.2

12.3/6.8

Stillbirth rate (%)e

6.4/3.9

5.7/3.6

3.1/0.6

18.4/8.8

2.9/1.7

Mummified piglets rate (%)f

2.0/1.4

1.7/1.3

0.6/0.0

9.9/5.2

1.2/0.9

Return-service rate (%)g

14.4/6.0

12.9/5.0

2.7/1.2

46.9/13.0

8.3/3.5

Mating rate within 7 days after weaning (%)h

55.7/69.2

58.2/69.9

0.0/19.2

85.8/83.8

16.5/12.6

Weaning to breeding intervali

17.2/9.6

12.8/9.0

4.7/6.5

23.5/22.0

13.8/3.1

Non-productive daysj

84.1/50.0

76.8/45.7

27.4/27.7

270.0/113.6

38.2/17.8

Production daysk

686.5/1481.0

502.0/763.0

120.0/280.0

5176.0/5176.0

768.6/1368.1

Birth weight of piglets (kg)l

1.2/1.2

1.2/1.2

1.0/1.0

1.6/1.5

0.1/0.1

21-day adjusted weight of piglets (kg)m

5.7/6.0

5.7/6.2

4.4/4.9

7.3/7.3

0.5/0.5

Longitude

113.8/111.4

113.5/109.0

104.8/103.2

128.8/123.4

5.6/7.1

Latitude

33.9/33.8

35.1/34.1

23.3/23.4

47.7/42.7

6.0/5.3

  1. aTotal number of piglets per litter: Total number of piglets per litter/Number of litters
  2. bNumber of piglets born alive per litter: Number of piglets born alive/Number of litters
  3. cNumber of weaned piglets per litter: Number of weaned piglets/Number of litters
  4. dFarrowing rate: Number of farrowed litters/(Number of farrowed litters+Gestation loss of 115 days pushed forward in the research stage)
  5. eStillbirth rate: Number of stillbirth/Total number of piglets
  6. fMummified piglets rate: Number of mummified piglets/Total number of piglets
  7. gReturn-service rate: Number of return service sows/Number of mating sows
  8. hMating rate within 7 days after weaning: Number of mating sows within 7 days after weaning/(Number of weaned sows7 days ago—number of culling sows 3 days ago—number of dead sows within 7 days after weaning)
  9. iWeaning to breeding interval: The first mating date of the sow in this breeding cycle—The weaning date of the sow in the same parity
  10. jNon-productive days: (Sum of non-productive days of all sows in the research stage/Days in the research stage) × 365.25/Average number of sows in the research stage
  11. kProduction days: Date of the last day of the research stage—Date of production started
  12. lBirth weight of piglets: Sum of birth litter weights in all birth records during the research stage/Number of born alive piglets
  13. m21-day adjusted weight of piglets: Actual average weaning weight×(2.218−0.0811×Average weaning age+0.0011×Average weaning age^2)