Tannins — a natural alternative to antibiotics
Tannins, the plant compounds from chestnut or quebracho, have long been known for their astringent taste and action on microbes. In poultry nutrition they are used as natural support in diarrhoea and gut problems. We explain how hydrolysable and condensed tannins differ, how they work and why you must be careful with the dose.
verifiedFrom the team that has organised work on poultry farms for years.
Tannins are natural plant compounds known as tannins — they give the sharp, astringent taste to unripe fruit or bark, for example. They are obtained among others from chestnut and quebracho wood. In poultry nutrition we are mainly interested in their antibacterial and astringent properties, which is why they are used as natural support in diarrhoea and gut problems — as part of the search for alternatives to antibiotics.
Why use tannins in poultry?
The main reason is gut health. Tannins act astringently on the mucosa and show antibacterial activity, which can help with diarrhoea and gut inflammation (enteritis). This places them within the search for natural alternatives to antibiotic growth promoters. You must, however, remember the other side of the coin: in excess, tannins act as anti-nutrients — they bind protein and reduce feed intake. That is why a sensible dose is key. Reviews of research on chestnut and quebracho tannins point to their potential while stressing the importance of proper dosing.
What’s worth knowing about tannins
Tannins are not a single compound — they differ in structure and source, and their benefits and risks depend above all on the dose.
Hydrolysable tannins — chestnut
This type of tannin, obtained among others from chestnut, breaks down more easily in the digestive tract. It shows antibacterial and astringent action, supporting the gut mucosa. It is a frequently chosen source of tannins in products for poultry, used with gut health and support in diarrhoea in mind.
Condensed tannins — quebracho
Condensed tannins, for example from quebracho wood, have a different structure and are more resistant to breakdown. They too act antibacterially and astringently, but bind protein more strongly, so the right dose matters all the more here. In practice both types are sometimes combined to achieve a balanced action.
Antibacterial action
Tannins can limit the growth of some disease-causing bacteria in the gut, which is one of the main reasons for the interest in them as an alternative to antibiotics. They do not, however, replace treatment — it is support for gut health, not a medicine. Research points to their potential, but the effect depends on the type of tannin and the dose.
Anti-diarrhoeal and astringent action
The astringent properties of tannins act on the gut mucosa, which is sometimes used in diarrhoea. They may support firmer droppings and, indirectly, drier litter, and thus foot condition. They work best as part of a wider care for the gut, rather than a standalone solution.
Support in enteritis
In gut inflammation (enteritis), tannins are sometimes used as natural support, easing some of the digestive-tract symptoms. This is, however, a complement to good management and — in case of illness — veterinary care, not a substitute for them. With serious health problems, always consult a vet.
Caution with the dose — the anti-nutrient effect
This is the most important thing with tannins: in excess they act as anti-nutrients. They bind feed protein and can lower its intake and digestibility, worsening results instead of improving them. That is why they are used in strictly defined, small doses — more does not mean better, quite the opposite.
Tannins step by step
- 1
Define the goal: gut health or diarrhoea
First decide why you’re reaching for tannins: preventive support for gut health or a response to diarrhoea and gut problems. The goal will suggest the type of product and the dose. Remember that tannins are support, not a medicine — with serious symptoms the first step is to consult a vet.
- 2
Pick the source: chestnut, quebracho or a blend
Products differ in the type of tannin — hydrolysable from chestnut, condensed from quebracho, or a combination. Choose products with a clearly stated source and tannin content and — as feed additives — authorised in the EU. A clear composition makes deliberate dosing easier.
- 3
Stick to the low, recommended dose
With tannins the dose matters most, because in excess they bind protein and lower feed intake. Use only the dose recommended by the manufacturer and don’t raise it “just in case”. The rule that more does not mean better truly applies here — exceeding the dose is counterproductive.
- 4
Introduce gradually and watch feed intake
After adding tannins, watch whether the birds eat and drink normally. The astringent taste and protein binding can affect feed intake, so react if appetite clearly drops. A gradual introduction lets you judge the flock’s response without risking a sudden worsening of results.
- 5
Combine with hygiene and good feed
Tannins work best as part of wider care for the gut: dry litter, clean water, good feed and calm rearing. They won’t fix mistakes in hygiene or replace treatment. Treat them as one of the tools supporting gut health, not a standalone solution to every problem.
- 6
Note the dose, symptoms and effects
Record which product, at what dose and when you used it, and what the droppings, litter and appetite looked like. This lets you compare flocks and judge whether tannins really help in your house. The notes will also ease a conversation with the vet, should the problem recur.
Frequently asked questions about tannins
Will tannins replace antibiotics?add
They should not be treated that way. Chestnut and quebracho tannins show antibacterial and astringent action, which is why they are studied as natural support for gut health and part of reducing antibiotics. They are not a medicine, however, and don’t replace veterinary treatment. With serious symptoms, always consult a vet.
How do hydrolysable tannins differ from condensed ones?add
These are two main types of tannin with a different structure. Hydrolysable ones, for example from chestnut, break down more easily in the digestive tract. Condensed ones, for example from quebracho, are more resistant to breakdown and bind protein more strongly. Both act antibacterially and astringently, and in practice are sometimes combined. In both cases the right dose is key.
Why must you be careful with the tannin dose?add
Because in excess tannins act as anti-nutrients: they bind feed protein and can lower its intake and digestibility, worsening results. That is why they are used in small, strictly defined doses. The rule that more does not mean better applies here — exceeding the recommended dose is counterproductive, so stick to the manufacturer’s guidance.
Do tannins help with diarrhoea?add
They can support. Thanks to their astringent and antibacterial properties, tannins are sometimes used as natural support in diarrhoea and gut inflammation. They work best as part of wider care for the gut — alongside dry litter, clean water and good feed. It is support, not a medicine, so with serious symptoms consult a vet.
Record additives and feeding in DlaFerm.pl
In DlaFerm.pl, next to the flock card, you note which tannins and other additives you give and at what dose, and the feed calculators help plan the recipe. Create a free account or write to us.
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