Salt licks for horses: necessary or superfluous?

Why horses need salt

Sodium and chloride — the building blocks of table salt — are essential for your horse's fluid balance, nerve conduction, and muscle function. An average 500 kg horse needs around 10 to 20 grams of salt per day at rest. In warm weather or during intensive training, that can rise to 50 grams or more, as horses can produce up to 10 litres of sweat per hour. Roughage and concentrate feed only supply a fraction of that requirement. A freely available salt source — a salt lick or loose salt — helps the horse regulate its own intake. That is immediately the greatest advantage of a salt lick: the horse determines the dose.

Types of salt licks: what are the differences?

Not every salt lick is the same. Broadly speaking, there are three variants on the market:

• Pure salt (white): sodium and chloride only, no added minerals. Inexpensive and suitable when your ration is already mineralogically balanced.
• Mineral salt lick (red/brown): contains salt as well as trace elements such as copper, zinc, manganese, and selenium. Handy as a supplement to basic hay without a forage analysis.
• Himalayan salt: pure rock salt with a pink colour. Contains minimal amounts of trace elements; the marketing claims are larger than the scientific evidence supports.
• Specific salt licks (e.g. biotin or magnesium): targeted at a deficiency. Only use these if a forage analysis or veterinarian indicates the need.
• Liquid or loose salt: a cheap and easily dosed alternative — adding around 30 grams of loose table salt per day works at least as well.

When is a salt lick really necessary?

A salt lick adds the most value when your horse receives little or no supplemented concentrate feed and lives purely on hay and grass. Hay contains on average 0.2 to 0.5 grams of sodium per kilogram of dry matter — far from sufficient. Horses that train hard, spend summers outdoors, or sweat heavily have an increased need. Pay attention to the signs too: a horse that licks wood or stable fittings is indicating a salt deficiency. In that case, always put out a simple white salt lick first before reaching for a complex mineral version.

Risks of over-supplementing minerals

More is not always better. If your horse is already receiving a concentrate feed or mineral premix that contains sufficient copper, zinc, and selenium, an additional mineral salt lick can lead to an imbalance. Selenium is the most critical here: the margin between the required amount (approximately 1 mg per day for a 500 kg horse) and the toxic dose is small. Chronic over-supplementation with selenium from both concentrate feed and salt licks can cause liver damage and hoof problems. Log everything your horse receives as supplements in the horse profile in EquiSight, so you always have a clear overview.

Practical tips for use and storage

• Hang the salt lick at approximately shoulder height so the horse can reach it comfortably without straining its neck.
• Protect an outdoor salt lick from rain; wet salt dissolves quickly, leading to waste and mud.
• Replace a salt lick that has become jagged or dirty; bacteria can accumulate on a damaged lick.
• Use a separate lick per horse in cases of contagious conditions such as strangles or herpesvirus.
• Weigh the lick monthly if you want to track intake — a horse consuming more than 100 grams per day warrants a ration check.

Combining a salt lick with a forage analysis

The most well-founded approach is to combine a hay analysis with the data from your concentrate feed. This shows you exactly which minerals are deficient or present in excess. Many laboratories in the Netherlands analyse hay for around €40 to €70 per sample. With those results, you can use EquiCoach in EquiSight to ask targeted questions about which type of salt lick or supplement best suits the ration of your specific horse. That is considerably more concrete than blindly putting out a mineral salt lick and hoping for the best.