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Table 4 Survival table, regarding to culling because of HLL, for Icelandic riding horses, distributed by age and RS.

From: Culling Rate of Icelandic Horses due to Bone Spavin

 

Without RS

With RS

Age k

n k

Censored c k

Withdrawn w k

Culling d k

Rate of culling ĥ

Survival function Ŝ

n k

Censored c k

Withdrawn w k

Culling d k

Rate of culling ĥ

Survival function Ŝ

6

357

0

0

0

0.000

1.000

151

0

0

0

0.000

1.000

7

357

3

3

2

0.006

0.994

151

1

1

1

0.007

0.993

8

352

19

19

0

0.000

0.994

149

2

2

1

0.007

0.987

9

333

37

37

0

0.000

0.994

146

6

6

5

0.035

0.952

10

296

25

25

1

0.004

0.991

135

7

7

0

0.000

0.952

11

270

66

11

1

0.004

0.987

128

17

7

4

0.032

0.922

12

203

64

14

2

0.010

0.977

107

19

0

6

0.056

0.870

13

137

55

8

0

0.000

0.977

82

21

3

10

0.124

0.762

14

82

28

3

1

0.012

0.965

51

15

4

2

0.041

0.731

15

53

23

0

2

0.038

0.929

34

16

0

0

0.000

0.731

16

28

18

1

1

0.036

0.895

18

12

0

2

0.111

0.650

17

9

8

0

1

0.111

0.795

4

4

0

0

0.000

0.650

Total

 

346

121

11

   

120

30

31

  
  1. RS: radiographic signs of bone spavin
  2. CHLL: culling because of hind limb lameness
  3. Withdrawn: horses that were sold or selected for breeding
  4. Censored: withdrawn + horses still in use after 5 years