Phytochemical Control of Gastrointestinal Nematodes in Livestock

Gastrointestinal nematodes pose a major threat to livestock health and productivity worldwide, with rising levels of resistance to conventional anthelmintics driving interest in plant‐derived compounds. Phytochemicals such as condensed tannins, flavonoids and terpenes have demonstrated an ability to impair nematode development, motility and survival through multiple mechanisms, including disruption of cuticle integrity, inhibition of larval exsheathment and interference with digestive processes. These bioactive molecules are sourced from a diverse range of materials—leguminous forages, tree bark, spices and fungi—and can be delivered as purified extracts or incorporated into feedstuffs. Advances in analytical techniques now allow precise characterisation of active constituents, while in vivo trials and metabolomic profiling help to optimise dosages and formulation strategies. Integrating phytochemical control into existing parasite management programmes offers a sustainable approach to reducing anthelmintic usage, improving animal welfare and mitigating residue concerns in animal products.

Research from Nature Portfolio

Extracts of cinnamon bark have been shown to contain high levels of procyanidin proanthocyanidins and trans-cinnamaldehyde, both of which exhibit potent in vitro activity against key livestock nematodes. Detailed chemical analysis revealed that while both classes of compounds contribute to nematocidal effects, much of the observed potency derives from the aldehyde fraction. Despite strong efficacy in larval and adult motility assays, dietary administration in vivo failed to reduce worm burdens, likely owing to rapid absorption and metabolism of trans-cinnamaldehyde before reaching the intestinal lumen. This work highlights the need for tailored delivery systems that maintain effective concentrations at the site of infection and points to formulation science as a critical next step in translating in vitro activity into practical on-farm solutions.

Phytochemical Control of Gastrointestinal Nematodes in Livestock publication trend

The graph below shows the total number of articles in phytochemical control of gastrointestinal nematodes in livestock across all publications each year (not limited to Nature Index journals).

Technical terms

Condensed tannins: Polymeric plant polyphenols composed of flavan-3-ol units that bind to proteins and impair nematode physiology.

Proanthocyanidins: A class of condensed tannins formed by oligomerisation of flavan-3-ols, often responsible for antiparasitic effects.

Exsheathment: The process by which infective nematode larvae shed their protective sheath to establish infection.

Metabolomics: The comprehensive analysis of small-molecule metabolites within a biological sample, used to identify bioactive compounds.

Degree of polymerisation: The average number of monomeric units in a polymer, influencing the biological activity of tannins.

References

1. 1H-NMR Metabolomic Study of the Mushroom Pleurotus djamor for the Identification of Nematocidal Compounds. Pharmaceuticals (2024).
2. Biological Function of Plant Tannin and Its Application in Animal Health. Frontiers in Veterinary Science (2022).
3. Impact of chemical structure of flavanol monomers and condensed tannins on in vitro anthelmintic activity against bovine nematodes. Parasitology (2016).
4. Anthelmintic activity of trans-cinnamaldehyde and A- and B-type proanthocyanidins derived from cinnamon (Cinnamomum verum). Scientific Reports (2015).