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Table 2 Number and percentage of pigs dead, hospitalised, and selected as replacement gilt by production flowa for four cohorts of pigs retrospectively identified according to the time they spent in each of the production stages in a study investigating management approaches for body weight variation in a farrow-to-finish pig commercial farm and their possible implications for animal health

From: Identifying challenges to manage body weight variation in pig farms implementing all-in-all-out management practices and their possible implications for animal health: a case study

Cohortb

Sub-cohortc

Initial No. of pigs

Description

Mortality

Hospital

Replacement gilts

Production flow

1

2

3

n

%

n

%

n

%

n

%

n

%

n

%

1

49

Pigs born one week later and weaned at 21 d of age

1

2.0

0

0.0

0

0

NAd

NA

NA

NA

NA

NA

2

888

Pigs weaned at 28 d of age

25

2.8

28

3.2

0

0.0

0

0.0

0

0.0

28

3.2

 

2a

326

Pigs weaned at 28 d of age. Splite by size 3 weeks post-weaning from cohort 2

21

6.4

0

0.0

26

7.7

265

81.3

0

0.0

15

4.6

 

2b

389

Pigs weaned at 28 d of age. Splite by size 3 weeks post-weaning from sub-cohort 2a and 5 weeks post-weaning from sub-cohort 2c

16

4.1

0

0.0

0

0.0

357

91.8

0

0.0

16

4.1

 

2c

120

Pigs weaned at 28 d of age. Smaller size pigs splite by size 5 weeks post-weaning from sub-cohort 2b

8

6.7

0

0.0

0

0.0

0

0.0

87

72.5

25

20.8

3

30

Pigs weaned at 35 d of age

2

6.7

0

0.0

0

0.0

0

0.0

25

83.3

3

10.0

4

8

Pigs weaned at 49 d of age

1

12.5

0

0.0

0

0.0

0

0.0

0

0.0

7

87.5

  1. aAnimals were slaughtered at 24 weeks of age and were retrospectively classified into three production flows (i.e. Flow 1 = normal, Flow 2 = delayed 1 week and Flow 3 = delayed > 1 week) according to the time they required to be moved to the next production stage
  2. bCohorts formed at weaning
  3. cSub-cohorts formed during the first nursery stage
  4. dNA No records available
  5. eSplit done based on farmer’s decisions and subjective appraisal