Genome-wide association study of insect bite hypersensitivity in two horse populations in the Netherlands

Table 2 Questionnaire results (numbers) from Shetland pony mare and Icelandic horse cases of insect bite hypersensitivity

	Shetland pony mares	Icelandic horses
Trait
Age at onset
Younger than 2 years	10	1
2 to 5 years	64	30
6 to 10 years	16	13
11 years or older	2	6
Unknown	11	9
Duration IBH
1 year	18	-
2 years	23	-
3 years or more	57	59
Unknown	5	-
Onset of symptoms
Spring	70	48
Summer	26	6
Autumn	1	-
Unknown	6	5
Disappearance of symptoms
Summer	7	-
Autumn	84	53
Winter	1	1
Chronic	3	-
Unknown	8	5
Severity of symptoms over years
Increases	9	1
Decreases	7	7
Remains equal	48	10
Varies	22	35
Unknown	17	6
Severity of itch
Mild	26	26
Moderate	33	22
Severe	38	9
Unknown	6	2
Preventive or curative measures
Yes	85	58
No	18	1
Applied measures ^a
Eczema blankets	28	51
Local treatment with oil or cream	72	45
Insecticide	22	25
Related to nutrition	3	17
Stabling	4	5

^aIn several cases more than one preventive measure was applied; sum of applied measures per breed therefore exceeded the total number of cases per breed.

ISSN: 1297-9686