Vitamin B1 (Thiamine) is under normal healthy conditions produced in sufficient quantities by the large intestine of the horse. When stressed or when workloads are high B vitamin production can be reduced and supplementation is recommended. The ratio of grains to forage also influences B vitamin production with high grain and low forage diets negatively impacting on production. Always feed adequate forage.
Almindelige kraftfoderblandinger og vitamintilskud til heste er tilsat vitamin B1. Ølgær er også en udmærket B-vitamin kilde.