Definition
What are phytogenics?
Phytogenics are biologically active compounds derived from plants, including herbs, spices, essential oils, oleoresins, and standardized botanical extracts, that are incorporated into animal nutrition to support physiological functions and improve animal health and performance.
Why now
Pressure to produce responsibly
Poultry businesses are expected to maintain growth, feed efficiency, welfare and food safety while using antimicrobials more responsibly. Antimicrobial resistance is a One Health concern: unnecessary or poorly controlled use can select resistant organisms with consequences beyond a single flock. Regulation and buyer requirements differ by market, but export programmes, integrator policies and customer assurance schemes increasingly demand clear records and prudent antimicrobial stewardship.
Phytogenics have consequently gained attention as one part of a broader antibiotic-reduction strategy. That wording matters. Removing a routine antibiotic input does not remove the conditions that allowed disease to develop. Stocking density, chick quality, vaccination, biosecurity, ventilation, litter, water hygiene, feed formulation and veterinary surveillance remain the foundation. A well-specified phytogenic may support gut function, intake or resilience within that system; it cannot compensate for persistent management failure.
Four practical uses
A framework for deciding where they fit
Natural growth promoters
Used to support appetite, digestion, nutrient utilisation, gut microbial balance and resilience. Performance is an outcome of the whole production system, not an automatic property of a plant extract.
Nutritional supplements
Plant-derived or naturally occurring nutrients can complement a formulation where their composition, bioavailability, stability and economics are understood.
Organ stimulants
Selected botanical systems are used to support normal liver, gut or reproductive function, especially when oxidative, dietary or environmental pressure is high.
Specific supportive applications
Targeted blends may support birds during respiratory, enteric, heat, immune or reproductive challenges while diagnosis and core veterinary and management controls continue.
Classes of material
The form changes the chemistry
Dried herbs and spices contain fibre, nutrients and a broad phytochemical mixture at relatively low concentration. Extracts concentrate selected soluble constituents according to the solvent and process. Essential oils concentrate volatile molecules such as thymol, carvacrol, menthol or 1,8-cineole. Oleoresins retain volatile and resinous fractions and may more closely represent a spice’s flavour profile. Defined compounds provide the clearest chemical identity but do not reproduce every constituent of the source plant.
These differences affect handling and use. Volatile oils may evaporate or be lost during heat processing unless protected. Strong aromas can alter feed or water acceptance. Tannin-rich botanicals may be useful at a controlled level but can reduce nutrient availability at excessive inclusion. Extraction can increase both desired constituents and unwanted contaminants. The supplier’s specification, not the plant name on its own, determines whether batches are comparable.
What they are—and are not
Different tools answer different questions
Antibiotics are substances used against susceptible bacteria under a defined veterinary and regulatory framework. A phytogenic feed supplement is not an antibiotic simply because one of its constituents inhibits a microorganism in a laboratory assay. Concentrations achieved in feed, water or the gut may be different, and an infected bird may require diagnosis and indicated treatment.
Probiotics are live microorganisms administered in adequate amounts for an intended benefit. Prebiotics are substrates selectively used by host microorganisms. Enzymes catalyse particular reactions, such as breaking down non-starch polysaccharides or proteins. Phytogenics may be used alongside these technologies, but they do not perform the same job. Combining categories can be rational only when viability, stability, water or feed compatibility and dose are verified.
In practice, phytogenic programmes are evaluated through measurable outcomes: feed and water intake, body-weight gain, feed conversion, flock uniformity, mortality, litter moisture, egg number and quality, hatchability, lesion or oocyst measurements where appropriate, and relevant laboratory markers. A favourable smell or an attractive list of Latin names is not efficacy data.
Potential benefits
Effects may extend across the system
Digestive effects can include support for appetite, secretions, enzyme activity, gut barrier function or microbial balance. Antioxidant constituents may contribute to the bird’s defence against reactive oxygen species during heat, dietary or disease challenge. Other materials are investigated for immune-response modulation, inflammatory balance or liver support. If these effects improve nutrient use and resilience, farms may observe better daily gain, feed conversion or production consistency.
Product quality and environmental outcomes are indirect and must be measured. Better nutrient utilisation can mean less undigested material reaching the litter. Drier litter may help reduce ammonia generation and support footpad condition. Antioxidant nutrition may influence oxidative stability in meat or eggs. None of these outcomes should be assumed from an ingredient list; they depend on the total diet, house environment and actual flock response.
Limitations
What phytogenics cannot do
Despite their potential benefits in poultry nutrition, the efficacy of phytogenic feed additives can be influenced by variations in botanical composition, bioactive concentration, bioavailability, and extraction methods.
Phytogenics biological activity may vary depending on dosage, bird age, health status, feed composition, and environmental conditions. Certain phytochemicals may exhibit reduced stability during feed processing and storage, while excessive inclusion levels can adversely affect palatability, feed intake, and physiological functions. The complex interactions between phytogenic compounds and other feed additives may also influence their effectiveness.
Furthermore, limited standardized quality parameters, inconsistent field responses, and insufficient large-scale scientific validation for certain applications remain important challenges. Therefore, appropriate standardization, formulation optimization, safety evaluation, and scientifically designed field trials are essential for achieving consistent and reliable outcomes in poultry production.
A practical buying checklist
- Authenticated botanical identity and plant part
- Marker-compound or compositional specification
- Contaminant, microbial and adulteration controls
- Clear inclusion rate, route and compatibility
- Stability through storage and feed processing
- Evidence on the same or comparable preparation
- Batch documentation and traceability
- A measurable farm objective and review point
Glossary
- Active compound
- A chemically defined constituent associated with an observed biological action.
- Botanical extract
- Material obtained from a plant using water, alcohol or another controlled extraction process.
- Essential oil
- A concentrated mixture of volatile aromatic compounds, usually obtained by distillation or expression.
- Marker compound
- A measured constituent used to help identify or standardise a raw material; it is not always the only active constituent.
- Oleoresin
- A concentrated extract containing volatile oil and less-volatile resinous constituents.
- Standardisation
- Setting and verifying compositional criteria so batches remain within an approved range.
Move from category to evidence
Explore each ingredient profile, then review where it appears in the GenNaturaal product range.