Can Hempseed Support Livestock Reproductive Health?

Hemp Feed Shows Promise and Tradeoffs in Ram Sperm Study

Hemp could become a more useful agricultural crop if producers can find reliable markets for the materials left after processing. Hempseed cake, the solid material remaining after oil extraction, is one candidate. It retains nutrients that may make it valuable in livestock diets, potentially connecting hemp processors with farmers seeking alternative feed ingredients.

A new study published in Small Ruminant Research examines a less familiar part of that opportunity: how hempseed and hemp cake affect reproductive biology in male sheep.¹ Researchers found improvements in sperm membrane integrity and mitochondrial function, alongside changes that complicate any claim of an overall reproductive benefit.

The findings support a practical form of optimism. Hemp may offer more than protein and calories, but its value will depend on formulation, processing, and the outcome being measured. Developing a useful feed ingredient requires understanding its tradeoffs as carefully as its advantages.

Why Hempseed Cake Is Attracting Livestock Feed Research

Hempseed contains protein and fats, including polyunsaturated fatty acids. Extracting its oil leaves a cake that retains protein, fiber, and residual oil. Finding suitable uses for that material could give processors another revenue stream while providing livestock operations with an additional source of nutrients.

A 2025 review of hemp byproducts in ruminant diets describes their nutritional potential while highlighting inconsistent animal responses and regulatory constraints. Importantly, different hemp materials have different compositions. Seed-processing residues cannot be treated as interchangeable with leaves and flowers remaining after cannabinoid extraction.

That distinction also appears in MyCannabis coverage of spent hemp biomass in chicken feed. The broader opportunity is to identify appropriate uses for specific materials, rather than assume that anything left over from hemp processing belongs in an animal ration.

How Researchers Tested Hemp Feed in Rams

The Polish research team studied 24 healthy Polish Lowland ram lambs, assigning six animals to each of four dietary groups. One group received a soybean meal control diet. The other groups received soybean meal combined with hemp cake, soybean meal combined with hempseed, or hemp cake combined with hempseed.

The diets supplied similar amounts of protein. However, they differed in fat content, an important consideration when interpreting the results. All animals received grass silage and 700 grams of concentrate daily during the 50-day feeding experiment.

After slaughter, researchers collected sperm from the cauda epididymis, a region where sperm are stored and mature before ejaculation. They evaluated movement, shape, membrane integrity, mitochondrial membrane potential, and oxidative balance. Blood samples provided testosterone measurements.

This was a laboratory assessment of reproductive markers, not a breeding trial. The researchers did not measure pregnancy rates, fertilization success, or lamb production.

What the Positive Sperm Findings Mean

Sperm cells depend on functioning membranes to maintain their internal environment and interact with their surroundings. Across all three hemp-fed groups, a greater proportion of sperm had intact plasma membranes than in the control group.

Mitochondrial membrane potential also improved. This measurement relates to the electrical gradient mitochondria use in energy production. It provides information about cellular function, although it does not directly demonstrate increased energy output or successful fertilization.

The soybean meal and hempseed group also showed greater sperm straightness, a measure of how directly sperm travel along their paths. Progressive motility tended to increase, but the difference was not statistically significant. Total motility and several velocity measurements did not significantly change.

These distinctions matter. The study identified improvements in particular cellular measurements, rather than a consistent improvement across every aspect of sperm quality. That makes the results useful for designing further experiments, but insufficient for claiming that hemp makes rams more fertile.

Why Better Antioxidant Balance Did Not Mean Better Results Everywhere

Hemp diets changed several measures of oxidative balance. Total oxidant status declined, while the group receiving hemp cake and hempseed showed significantly higher total antioxidant status and a lower oxidative stress index. These results suggest that the diets influenced how sperm cells handled oxidants and antioxidant defenses.

Yet the same highest-hemp group had significantly more malondialdehyde, a marker of lipid peroxidation. In simple terms, this indicates increased breakdown of fats through oxidation. Apparently favorable antioxidant measurements therefore coexisted with evidence of greater lipid damage.

The researchers discuss a possible explanation involving polyunsaturated fats. These fats may support membrane properties while also being susceptible to oxidation. Changing the amount and composition of dietary fat could create benefits in one measurement and disadvantages in another.

MyCannabis recently examined a related tradeoff involving hempseed oil and lamb meat quality. Although that research addressed a different outcome, both stories point toward the importance of balancing desirable fatty-acid changes with oxidative stability.

Sperm Morphology Deserves Equal Attention

All hemp-fed groups had significantly fewer sperm with normal morphology than the control group. The soybean meal and hemp cake group also had significantly more head defects. These findings deserve equal weight alongside improved membrane function.

Testosterone declined in the group with the highest hemp inclusion. The authors report that concentrations remained within a physiological range consistent with early sexual maturation and seasonal activity. That context limits the meaning of the decline, but does not establish long-term reproductive safety.

The Commercial Opportunity Is Consistent Feed Formulation

The most useful commercial insight is that hempseed cake should be evaluated as a defined ingredient with measurable properties. Its appeal cannot rest solely on being a byproduct or containing beneficial fats.

A processor seeking feed customers would need consistent batches, nutrient analysis, appropriate storage, and clear specifications. Residual oil content could affect both ration design and stability. A feed manufacturer would then need to determine how the material fits alongside existing protein, energy, fiber, and mineral sources.

This is an opportunity to create value through quality control. Predictable ingredients allow nutritionists to formulate more confidently. In principle, a dependable local source could also diversify supply, although this study did not measure feed costs, profitability, or environmental savings.

The research pipeline is widening. A 2026 study of hemp hulls and screenings investigated other seed-processing materials as ruminant feed ingredients. Such work illustrates why commercial development should match each material to a specific application rather than pursue one universal hemp feed formula.

What Hemp Feed Research Needs to Establish Next

The ram study provides a starting point, with several clear priorities:

• Test lower and intermediate inclusion levels over longer periods.
• Evaluate ejaculated semen and actual fertilization outcomes.
• Measure feed consistency, cannabinoid residues, and practical production costs.

Six animals per group leaves substantial uncertainty. The 50-day exposure also did not fully encompass sperm development and subsequent epididymal maturation for every evaluated cell. Longer trials in mature breeding animals would help establish whether these responses persist and translate into meaningful reproductive outcomes.

Commercial use must also follow applicable feed rules for the ingredient, animal species, and jurisdiction. An industrial hemp classification alone does not establish authorization for every livestock application.

Hempseed and hemp cake remain credible candidates for further feed development. The encouraging result is that they produced measurable biological effects worth investigating. Turning that promise into a dependable agricultural product will require formulations that preserve the advantages while addressing the tradeoffs.

References:

¹ Koziorowska-Gilun, M., Pogorzelska-Przybyłek, P., Gilun, P., Dziekońska, A., & Purwin, C. (2026). Effects of dietary supplementation with hemp cake and hempseed (Cannabis sativa L.) on the quality parameters and oxidative-antioxidative status of epididymal sperm in rams. Small Ruminant Research, 264, 107906. https://doi.org/10.1016/j.smallrumres.2026.107906