Feeding ruminants with olive by-products enhances animal performance and product quality
An olive mill does not just make oil; it makes mountains of leftover leaves, pulp and pomace. Feeding those by-products to sheep and goats turns a disposal headache into useful feed — and even nudges their milk and meat toward healthier fats.
For every litre of oil, an olive mill produces a great deal of something else: prunings and leaves from the grove, and the wet, spent pulp and skins — pomace — left after pressing. In the traditional Mediterranean farm none of it went to waste; it fed the animals. Modern research has confirmed the old instinct with numbers: olive by-products can be a genuinely useful feed for ruminants, especially the sheep and goats that have always shared the olive landscape. What looks like waste is, handled right, a resource.
Why ruminants can eat what we cannot
The magic is in the animal. Sheep and goats are ruminants: their multi-chambered stomachs, full of microbes, can break down tough, fibrous plant matter that would be useless to us. Olive leaves and pomace are exactly that — high in fibre, awkward, but full of latent energy and some protein. Fed sensibly, and supplemented where needed, olive leaves can supply a good share of a sheep or goat’s basic maintenance needs, especially in the dry season when other forage is scarce.
The healthier-fat bonus
Here is the intriguing part. Olive by-products still carry some of the oil’s monounsaturated fat — the ‘good’ oleic acid. Studies have found that feeding olive residues can nudge the fat profile of the animals’ milk and meat in a favourable direction: more monounsaturated fat, less saturated. It is not a dramatic transformation, and it should not be oversold, but it is a neat example of the olive’s goodness travelling one step further down the food chain, from grove to flock to plate.
The whole-olive economy
Step back and this is really a story about circularity, long before that became a buzzword. A well-run olive farm wastes almost nothing: the oil to the table, the prunings and pomace to the animals, the animals’ manure back to the grove. Pomace disposal is a real environmental burden when it is simply dumped, so turning it into feed solves two problems at once — a cost and a pollutant become nourishment. It is the kind of frugal, closed loop the olive economy quietly ran for centuries, and that modern farms are rediscovering.
| Olive by-product | What it is | Feed value |
|---|---|---|
| Leaves & prunings | Trimmed from the grove | Fibrous; decent maintenance forage, esp. in dry season |
| Olive pomace / cake | Spent pulp and skins after pressing | Energy and some protein; carries residual healthy oil |
| Combined, supplemented | Mixed into a ration | Cuts feed cost and waste; shifts fats favourably |
What to take from it
- Milling olives leaves leaves, prunings and pomace — a real disposal burden.
- Sheep and goats can digest this fibrous material and turn it into milk and meat.
- Residual olive oil can nudge their fats toward more monounsaturated, less saturated.
- It is a classic closed loop: waste and pollutant become feed, in the old whole-olive economy.
Feeding olive by-products to livestock: common questions
What by-products does an olive mill produce?
Leaves and prunings from the grove, and pomace — the wet spent pulp and skins left after the oil is pressed out. Together they are a large volume of leftover material.
Can sheep and goats really eat olive waste?
Yes. As ruminants, their microbe-filled stomachs break down tough, fibrous plant matter. Olive leaves and pomace, fed sensibly and supplemented, are a useful feed, especially in the dry season.
Does it change the milk and meat?
Modestly. Because the residues carry some of the oil’s monounsaturated fat, studies find feeding them can shift the animals’ milk and meat toward more monounsaturated and less saturated fat.
Why not just throw the pomace away?
Dumped pomace is an environmental burden. Turning it into feed removes a pollutant and a cost while nourishing livestock — solving a waste problem and a feed problem at once.
Is this a new idea?
No — traditional Mediterranean farms fed olive leftovers to their animals for centuries. Modern research has simply confirmed and quantified an old, frugal practice.
The thing city folk never see about an olive harvest is the sheer volume of stuff that is not oil — leaves, prunings, and wet pressed pulp by the ton. On a proper old farm none of it was rubbish: the sheep and goats ate it, and gave back manure for the grove. It even tips their milk and meat toward the better fats, which is a nice bonus, not a miracle. Dump that pomace and it is a pollutant; feed it and it is dinner. The olive economy was circular before anyone had the word.
Drawn from published research on olive by-products in ruminant diets and traditional Mediterranean farming practice.