Plasma insulin concentration increases linearly with body condition in Icelandic horses.
BACKGROUND
This study investigated the variation in plasma insulin concentration (PIC) in a group of Icelandic horses in training, considered to be healthy and examined possible relationships between PIC and gender, age, body size, body condition score and management factors such as feed allowance and subjective level of fitness.


RESULTS
Plasma insulin concentration ranged from 0.2 to 13.9 mU/l, body condition score from 2.3 to 4.0 and concentrate allowance from 0 to 4 kg. There was a significant effect of concentrate allowance (P = 0.0007) and body condition score (P = 0.004) on PIC. For every 1 kg increase in the concentrate allowance, log-PIC increased by 0.26 mU/l. For every 1 unit increase in body condition score, log-PIC increased by 0.45 mU/l. There was no effect of hay allowance, level of fitness, transport time, body size and age on insulin concentration.


CONCLUSIONS
Owners of Icelandic horses should be aware that increased body condition elevates PIC, and thereby potentially the risk of laminitis. However, in the group of horses studied, the concentrations were within the range considered normal.
Department of Anatomy, Physiology and Biochemistry, Swedish University of Agricultural Sciences, Box 7011, 750 07, Uppsala, Sweden. anna.jansson@slu.se.
Anna
http://orcid.org/0000-0001-5612-9020
A
Jansson
Department of Equine Science, Holar University College, 551, Sauðárkrókur, Iceland.
Gudrun J
GJ
Stéfansdóttir
Department of Equine Science, Holar University College, 551, Sauðárkrókur, Iceland.
Sveinn
S
Ragnarsson
D000821:Animal Feed / Q000032:analysis / Q000592:standards; D000818:Animals; D001824:Body Constitution / Q000502:physiology*; D004032:Diet / Q000662:veterinary*; D005260:Female; D006736:Horses / Q000097:blood / Q000502:physiology*; D007328:Insulin / Q000097:blood*; D008297:Male
D007328:Insulin
Age; Concentrate; Equine; Feed; Fitness; Gender; Hay; Metabolic; Transport