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Food Tech

Can a CBD byproduct be turned into feed for cows, chickens and sheep? What the research shows

Hemp grown for CBD leaves behind large volumes of plant material. Researchers have studied whether it can safely feed livestock, and the answer depends on residues, regulation and storage.

By Editorial desk · · 3 min read

Feedstock
Spent hemp biomass after cannabinoid extraction
Key question
Do cannabinoid residues carry into milk, meat or eggs?
Status
Use in feed is still restricted or unapproved in many jurisdictions

When hemp is grown for cannabidiol (CBD), only a small share of the plant ends up in the oil. The rest, the extracted leaves, flowers and stems often called spent hemp biomass, is left over in large volumes. Disposing of it costs money. Feeding it to livestock is an obvious idea: it is fibrous, contains protein and is already harvested and dried.

Agricultural researchers, including teams at US land-grant universities such as Oregon State University, have looked at this question in feeding trials with cattle, sheep and poultry. This article summarises what that kind of work examines and why the answer is still "possibly, with conditions" rather than a simple yes.

Why the byproduct is attractive

  • Volume. Extraction leaves most of the harvested mass behind.
  • Nutrition. Hemp biomass contains crude protein and fibre in ranges that can suit ruminant diets, though it varies widely by variety and processing.
  • Circularity. Using a waste stream as feed reduces disposal costs and could lower feed bills on farms near processing sites.

Hemp seed and seed cake are a different, better-understood product. They have been studied and in some places approved as feed ingredients. The CBD byproduct question is about the rest of the plant.

What feeding trials look at

Research in this area typically asks four things:

  1. Palatability and intake. Do animals eat it, and how much can be included without reducing intake?
  2. Performance. Does growth, milk yield or egg production change?
  3. Animal health and behaviour. Do cannabinoids affect the animals? Some trials have reported changes in behaviour or physiological markers, which is relevant to welfare.
  4. Residues. Do cannabinoids such as CBD and THC, or their metabolites, show up in milk, fat, meat or eggs, and how long after feeding stops?

The residue question is the one that matters most for the food chain. Regulators need to know whether meat and dairy from animals fed hemp biomass are consistent and safe, and whether products could carry measurable THC.

Regulation is the bottleneck

In many jurisdictions, hemp biomass is not an approved feed ingredient. Approval usually requires a formal submission with safety, residue and efficacy data. That process is slow and expensive, and the variability of hemp material makes it harder: biomass from different varieties, growers and extraction methods can differ in cannabinoid content and nutrient profile.

Producers considering this route should treat it as a research and regulatory project, not a feed purchase. Using unapproved ingredients can put livestock products outside the rules for sale.

The storage and handling angle

Spent biomass has a practical problem that links it to the wider food supply chain: it spoils. Wet or poorly dried material can grow mould and produce mycotoxins, which are a serious risk in any feed. Extraction residues may also contain solvent traces depending on the method used.

Making a reliable feed product would require:

  • Fast, controlled drying after extraction;
  • Ensiling or pelleting to stabilise the material;
  • Dry, ventilated storage with moisture monitoring;
  • Batch testing for cannabinoids, mycotoxins and solvents.

This is the same discipline applied to other byproduct feeds such as brewers' grains, distillers' grains and fruit pomace. Those products became mainstream because the handling and testing were standardised.

Lessons from other byproduct feeds

The food and beverage industry already sends large volumes of byproduct to livestock. Brewers' spent grain, bakery waste, whey and vegetable trimmings all have established routes. Many of these are perishable and travel in a short, sometimes chilled, supply chain between factory and farm. Hemp biomass would need similar logistics, plus extra testing because of cannabinoids.

What to watch

  • New feeding trials with larger herds and longer durations;
  • Residue studies that set withdrawal periods;
  • Feed regulators publishing decisions on hemp biomass;
  • Standard specifications for processed hemp feed products.

The idea of turning a CBD byproduct into feed for cows, chickens and sheep makes sense for agriculture. Whether it becomes common depends on residue data, regulatory approval and careful handling, not on the volume of material waiting to be used.

Key figures above are general reference points, not regulatory limits.