Study links Zanthoxylum leaf extract to higher laying rates
Bottom line
A new study in Veterinary Sciences reports that adding Zanthoxylum armatum ‘Jiuyeqing’ leaf extract, or ZBLE, to layer diets improved laying performance and antioxidant markers in 41-week-old Lohmann Pink hens over an eight-week trial. Researchers assigned 1,024 hens to diets containing 0, 2, 4, or 6 g/kg of the extract and found a linear increase in laying rate, with the 6 g/kg group outperforming controls. The paper also linked supplementation to stronger antioxidant enzyme activity and changes in hepatic metabolomic profiles, suggesting the plant extract may be influencing liver metabolism as well as production outcomes. Broader literature on phytogenic feed additives in poultry points in the same direction, with plant-derived compounds often studied for antioxidant, gut health, and performance effects, though responses can vary by dose, formulation, bird age, and production setting. (mdpi.com)
Why it matters: For veterinary professionals and poultry advisers, the study adds to the growing evidence base around phytogenic additives as a potential nutrition tool in laying hens, especially where producers are looking for non-antibiotic strategies to support persistency, oxidative balance, and possibly liver health. But it’s still an early-stage signal, not a plug-and-play recommendation. Reviews of phytogenic additives consistently note that efficacy depends heavily on standardization of the extract, inclusion rate, and commercial conditions, which means field validation, cost-benefit analysis, and safety review matter before broad adoption. (pmc.ncbi.nlm.nih.gov)
What to watch: The next step is whether follow-up studies test ZBLE under commercial farm conditions, define the active compounds more clearly, and show whether the production gains justify the cost at scale. (mdpi.com)
A newly published paper in Veterinary Sciences suggests that Zanthoxylum armatum ‘Jiuyeqing’ leaf extract could become another plant-based feed additive to watch in layer nutrition. In an eight-week feeding trial, researchers reported that supplementing diets with the extract improved laying rate in a dose-responsive pattern, with the highest inclusion level, 6 g/kg, performing better than the control. The study also found stronger antioxidant status and shifts in hepatic metabolomic profiles, tying production changes to possible effects on liver metabolism. (pmc.ncbi.nlm.nih.gov)
The paper lands in a crowded but still evolving area of poultry nutrition. Phytogenic feed additives have drawn sustained interest as producers and nutrition teams look for tools that may support productivity, oxidative balance, gut function, and resilience without relying on antibiotic growth promoters. Reviews and meta-analyses in laying hens generally describe favorable average effects on productivity and antioxidant measures, but they also stress that results are inconsistent across products and settings because plant source, extraction method, active compound profile, bird age, and diet formulation can all change the outcome. (pmc.ncbi.nlm.nih.gov)
That context matters here because Zanthoxylum armatum leaves are already known to contain phenolics, flavonoids, and other bioactive compounds with antioxidant potential. A separate MDPI study on Z. armatum leaves found that their chemical composition and antioxidant capacity vary with plant age, shoot type, and leaf position, which is useful background for anyone thinking about reproducibility or commercialization. In other words, the biological signal may be real, but standardizing the raw material could be just as important as choosing the right dose. (mdpi.com)
The new layer study’s design was sizable for an academic feeding trial: 1,024 hens, four dietary treatments, eight replicates per treatment, and 32 hens per replicate, according to the study abstract. The authors reported significant linear gains in laying rate during both weeks 1 to 4 and weeks 1 to 8, with the 6 g/kg group higher than controls. They also reported improvements in antioxidant indicators, including superoxide dismutase and catalase, alongside reduced malondialdehyde, and used hepatic metabolomics to explore possible mechanisms behind the performance response. That metabolomics angle is notable because it moves the discussion beyond simple production endpoints and toward how the additive may be affecting systemic physiology. (pmc.ncbi.nlm.nih.gov)
There doesn’t appear to be a separate institutional press release or broad industry reaction tied specifically to this paper in the indexed search results, but adjacent research suggests the topic is gaining momentum. In January 2026, another team, including one overlapping author, Qiaobo Lei, published a study in Animals showing that Zanthoxylum bungeanum leaves improved production performance, antioxidant status, and gut health in laying hens. That doesn’t validate the new Z. armatum paper on its own, but it does suggest a broader research program around Zanthoxylum-derived poultry feed ingredients. (mdpi.com)
Why it matters: For veterinarians working with commercial poultry systems, the practical question isn’t whether plant extracts can move a biomarker in a controlled trial. It’s whether a specific, standardized product can deliver repeatable gains in egg output or hen resilience without creating new variability in formulation, palatability, or cost. This study strengthens the case that leaf-derived phytogenics may have a place in layer diets, particularly where oxidative stress, liver function, or late-cycle persistency are concerns. At the same time, the wider literature is clear that phytogenic performance is not uniform, and benefits seen in research settings may narrow under commercial conditions. (pmc.ncbi.nlm.nih.gov)
There’s also a feed economics and sustainability angle. Zanthoxylum leaves can be treated as an agricultural by-product, and prior work on Z. armatum has framed the leaves as a potentially valuable source of antioxidant compounds rather than waste. If future studies confirm consistent production benefits, that could make the ingredient interesting not just nutritionally, but also from an ingredient-sourcing perspective. (mdpi.com)
What to watch: The next milestone will be replication, ideally with full-text publication details, clearer characterization of the extract’s active compounds, and commercial-scale trials that test performance, egg quality, safety, and return on investment across different flocks and production phases. (pmc.ncbi.nlm.nih.gov)
Common questions
What did the study find about Zanthoxylum armatum leaf extract in laying hens?
In an eight-week trial, adding the extract to layer diets improved laying rate and antioxidant markers in 41-week-old Lohmann Pink hens.What dose worked best in the study?
The 6 g/kg group performed better than the control group, and laying rate increased in a linear pattern across the doses tested.How many hens were included in the trial?
The researchers assigned 1,024 hens to four dietary treatments.Did the study say this should be used on farms now?
No. The article says it is an early-stage signal, and that field validation, cost-benefit analysis, and safety review are still needed before broad adoption.