08/12/2025
15 min soak time π
Soaking hay is often recommended during the management of laminitis, EMS/insulin dysregulation, PPID/cushings and overweight horses. The aim is to reduce the sugar levels of the hay to get them to safer levels prior to being fed. Some experts also suggest it will reduce the digestible energy (calories) and aid weight loss.
Research over the years has suggested that this practice does have some effect on sugar levels (around 20-40% reduction of sugars depending on hay type etc), and to a lesser extent energy (5-15% decrease, which aligns with the sugar losses), but this paper warns that soaking for too long - something I often hear recommended - may have other detrimental effects.
This study looked at soaking for 0, 15 min, 30 min, 60 min and 12 hours, and found that 15 minutes soaking was sufficient to reduce water soluble carbohydrates (aka sugar), and longer soaking times did not significantly reduce sugars further.
What did reduce with longer soak times, were a lot of the other nutrients!
Crude protein reduce after 15 minutes but didn't continue to be lost - so protein supplementation may need to be considered even with short soaks.
Many of the minerals were progressively lost over time, to around half of their original concentrations after a 12 hour soak - something to keep in mind - horses on soaked hay may need extra mineral supplementation.
I have always recommended a 30-60 minute soaking time, however based on this research I will be shortening it - we don't want to be leaching out other nutrients unnecessarily, and having to feed supplements to make up for it π§