Culling Rate of Icelandic Horses due to Bone Spavin

Table 5 Survival table, regarding to culling because of HLL, for Icelandic riding horses, distributed by age and lameness after flexion test.

	Without lameness after flexion test						With lameness after flexion test
Age k	n _k	Censored c_k	Withdrawn w_k	Culling d_k	Rate of culling ĥ	Survival function Ŝ	n _k	Censored c_k	Withdrawn w_k	Culling d_k	Rate of culling ĥ	Survival function Ŝ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	340	0	0	0	0.000	1.000	168	0	0	0	0.000	1.000
7	340	2	2	2	0.006	0.994	168	2	2	1	0.006	0.994
8	336	13	13	0	0.000	0.994	165	8	8	1	0.006	0.988
9	323	31	31	2	0.007	0.988	156	12	12	3	0.020	0.968
10	290	22	22	0	0.000	0.988	141	10	10	1	0.007	0.961
11	268	64	14	3	0.011	0.976	130	19	4	2	0.016	0.946
12	201	56	12	1	0.005	0.971	109	27	2	7	0.065	0.885
13	144	56	8	1	0.007	0.964	75	20	3	9	0.122	0.776
14	87	28	4	0	0.000	0.964	46	15	3	3	0.067	0.724
15	59	26	0	2	0.034	0.932	28	13	0	0	0.000	0.724
16	31	21	1	1	0.033	0.901	15	9	0	2	0.133	0.627
17	9	8	0	1	0.111	0.801	4	4	0	0	0.000	0.627
Total		327	107	13				139	44	29

Lameness after flexion test: hind limb lameness after flexion test of the tarsus
CHLL: culling because of hind limb lameness
Withdrawn: horses that were sold or selected for breeding
Censored: withdrawn + horses still in use after 5 years

ISSN: 1751-0147