01/25/2026
💧 𝐃𝐨 𝐌𝐚𝐬𝐡𝐞𝐬 𝐀𝐜𝐭𝐮𝐚𝐥𝐥𝐲 𝐈𝐧𝐜𝐫𝐞𝐚𝐬𝐞 𝐖𝐚𝐭𝐞𝐫 𝐈𝐧𝐭𝐚𝐤𝐞 𝐢𝐧 𝐇𝐨𝐫𝐬𝐞𝐬?
Soaking feed or utilizing mashes is a common practice intended to increase water intake in horses - but does it actually help?
I decided to take a dive into the research, as many horse owners soak feed in the winter, particularly during cold weather snaps, to encourage water intake. And while digging, I came across two studies you may find interesting!
🧪𝐒𝐭𝐮𝐝𝐲 𝟏 (𝐅𝐞𝐫𝐫𝐞𝐢𝐫𝐚 𝐞𝐭 𝐚𝐥., 𝟐𝟎𝟐𝟓)
The first study took place in Florida, where the average ambient temperature during the study was 55°F (13°C). This research evaluated horses consuming soaked pelleted feed, alfalfa cubes, or beet pulp in a 2:1 ratio of water to concentrate.
This study found that horses rapidly self-regulated voluntary water intake based on the amount of water provided in the meal. This means, when water was added to their feed, they voluntarily drank less so total water consumption remained the same.
This was shown as horses on dry feed had a voluntary water intake of 32.2 L while horses on soaked feed reduced voluntary water intake to 25.4 L to accommodate the ~6 L of water provided in the mash, for a total water intake of 31.5 L.
But that brings us to the second study 👇
❄️ 𝐒𝐭𝐮𝐝𝐲 𝟐 (𝐑𝐮𝐜𝐤𝐞𝐫 𝐚𝐧𝐝 𝐇𝐢𝐧𝐞𝐲, 𝟐𝟎𝟏𝟑)
This study evaluated seasonal differences in water intake during the fall (55°F; 12.8 °C) and winter (-4 to 33°F; -20 to 0.67°C) in Wisconsin. Horses were fed a pelleted concentrate at 0.5% body weight, with soaked feed provided at 2 L water/kg feed.
This study found that horses drank:
🍁 29.3 L/day in the fall
❄️ 24.7 L/day in the winter
This decrease supports previous findings that water intake drops by approximately 6–12% during the cold winter months.
However, this study also evaluated soaked vs dry feed.
While no difference in voluntary water intake was observed during the fall trial, horses in the winter consumed more water when eating a mash (26.9 L) compared to when consuming dry feed (22.4 L), a difference of about 1.2 gallons per day. The study found that horses consuming the mash drank equal to or more water than horses consuming the dry grain, in addition to the water they consumed in their feed.
✨𝐓𝐚𝐤𝐞-𝐡𝐨𝐦𝐞 𝐦𝐞𝐬𝐬𝐚𝐠𝐞
Cold weather can reduce voluntary water intake in horses, but feeding a mash during winter can help combat that decline. In more mild weather, however, soaking feeds likely does not increase total water intake, as horses will self-regulate.
Will these studies make you more likely to soak you feeds - why or why not?
Stay warm out there!
Dr. DeBoer
Ferreira N, Binder D, Garbati IH, Lance JM, Warren LK. Effect of soaking feed on water intake and hydration in horses. Journal of Equine Veterinary Science. 2025 May 1;148:105449.
Rucker NK, Hiney KM. Voluntary water intake in horses when fed a dry versus mash grain in two different seasons. Journal of Equine Veterinary Science. 2013 May;33(5):355-6.
