Sand colic is a common concern for horses kept on sandy soils, as ingestion of sand can lead to irritation or impaction of the large colon. One of the most frequently recommended preventative measures is the use of psyllium husk, but just how effective is it?
How Psyllium Works
When eaten, psyllium forms a gel-like substance in the large intestines. This sticky gel can help trap sand particles, carrying them out of the digestive tract in the horse’s droppings. The theory is simple, but in practice, the results vary significantly between horses.
The effectiveness of psyllium depends on:
- the amount of sand a horse ingests,
- the amount and frequency of psyllium fed,
- how many consecutive days it is given,
- and the individual horse’s health and digestion.
Alongside supplementation, management practices play an important role. Horses should be provided with plenty of forage, good hydration, and ideally kept off overgrazed, sandy pasture. Feeding from the ground in sandy areas should be avoided where possible.
Recommended Amounts
For an average 500kg horse, 500g of psyllium per day for 7–10 days each month is considered appropriate. However, research has shown that the response to this regimen is inconsistent. Some horses show a significant increase in sand removal, while others show little benefit.
The highest levels of sand clearance have been recorded using nasogastric intubation with a mixture of 500g magnesium sulphate and 500g psyllium for 3–7 consecutive days – but this is a veterinary procedure, not a practical routine option for owners.
Evaluating Commercial Products
Some commercial products may not provide sufficient psyllium at the recommended feeding rates. For example, Colonaid, produced by Hestevard and sold through vets, contains psyllium along with soya beans, extruded linseed oil, and kaolin. However, the exact amount of psyllium is not disclosed. Based on label information, the estimated psyllium content per daily dose could be around 100g – only one-fifth of the level shown to have some effect in published studies.
This means the product would need to be fed at around five times the recommended rate to deliver an effective psyllium dose, which is not advisable due to the inclusion of other ingredients such as kaolin.
Common Questions
Q: Should psyllium be fed every day?
A: No. Psyllium should be given as a short course – 7 to 10 days each month – at 1g per kg of bodyweight (500g for a 500kg horse).
Q: Can I use psyllium from non-equine sources?
A: Yes. Psyllium can be bought more cheaply from other suppliers and fed at the correct dose.
Q: Is psyllium always effective?
A: No. While many horses benefit, others do not respond as well. Supplementation should always be combined with good management to reduce sand ingestion in the first place.
Final Thoughts
Psyllium can play a useful role in helping reduce the risk of sand accumulation in the horse’s digestive tract, but it is not a guarantee against sand colic. Consistency in management, appropriate dosing, and awareness of individual horse responses are key.
For further information and research links, see LINK.
