Chicken Litter Screening Tool

All Litter Types

Crop and nut hulls / Suitable

Almond hulls

Prunus dulcis

Applied commercially in the chicken meat industry. The results of trials conducted overseas were positive. The results of a trial conducted in Australia were negative—likely due to poor management. Success depends on management. Possible concerns: limited information.

POTENTIAL HAZARDS: Biological contaminants

Crop and nut hulls / Unknown

Barley hulls

Hordeum vulgare

Likely to have similar properties to rice hulls. Not applied commercially in the chicken meat industry. Trials should be conducted before the commercial use of this product.

POTENTIAL HAZARDS: Biological contaminants

Earth-based materials / Unsuitable

Bentonite (litter amendment)

Not applied commercially as a litter, it is used as a litter amendment. Very high moisture holding capacity and low release rate may lead to caking problems. Was found to reduce ammonia emissions in trial research (Redding 2013). The results of trials conducted overseas and in Australia using bentonite as a litter were also negative. Can have significant clumping and dust issues.

POTENTIAL HAZARDS: Possible bird and human health concerns if used as a litter.

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Crop and nut hulls / Unknown

Cashew hulls

Anacardium occidentale

Not applied commercially in the chicken meat industry.

POTENTIAL HAZARDS: The unprocessed cashew contains toxins inside shell.

Other materials / Unknown

Charcoal / biochar

Charcoal and biochar are highly absorbent by-products. They have not been used or trialled for chicken litter before and would require extensive testing before being applied commercially. Could be used in mixes.

POTENTIAL HAZARDS: Untested in Australian commercial chicken meat production.

Earth-based materials / Unsuitable

Clay

The results of trials conducted overseas were negative. Significant clumping and management problems. Possible concerns: bird health.

POTENTIAL HAZARDS: Significant clumping problems and bird health concerns.

Crop and plant residues / Unknown

Cotton gin trash

Gossypium hirsutum

Not applied commercially in the chicken meat industry. Historically, there have been contamination problems, which have reduced in recent years. Provided contamination issues could be managed, this has potential as an alternative litter. The results of trials conducted overseas were negative. High footpad dermatitis and possible pesticide contaminates. Possible concerns: bird health.

POTENTIAL HAZARDS: Organic chemical contaminants Biological contaminants

Crop and nut hulls / Unsuitable

Cottonseed hulls

Gossypium hirsutum

Successfully used overseas.

POTENTIAL HAZARDS: Organic chemical contaminants Biological contaminants

Crop and nut hulls / Unsuitable

Crushed husks

Probably similar to hazelnut husks. 6–8% moisture content resulting in 20% more efficiency than sawdust. The results of trials conducted overseas were positive. Possible concerns: limited information.

POTENTIAL HAZARDS: Biological contaminants

Crop and plant residues / Suitable

Crushed straw pellets

Not applied commercially in the chicken meat industry. Used for small animal bedding. Crushed straw pellets have a larger specific surface area than straw pellets.

POTENTIAL HAZARDS: Biological contaminants

Earth-based materials / Unsuitable

Crusher dust

Chickens naturally ingest small rock, grit, sand and/or gravel into gizzards. This caused significant problems with the processing machinery in a single-batch, crusher dust Australian trial. While sand is commonly used in meat chicken production in the USA and Israel litter is used for multiple batches, which reduces this problem overseas. However, the chickens produced are smaller/younger than Australian meat chickens.

POTENTIAL HAZARDS: Physical contaminants

Earth-based materials / Unsuitable

Diatomite / diatomaceous earth

The results of trials conducted in Australia were positive. It is highly absorbent and has insecticide and anticaking properties. Bird health and productivity was not affected by this material. It did not cause problems with processing machinery, however, it poses potential health risks to workers and industry has moved away from this material.

POTENTIAL HAZARDS: Long-term inhalation of the dust associated with respiratory disease.

Earth-based materials / Unsuitable

Glass beads

The results of a commercial trial conducted in Australia with glass bead by-product from glass manufacturing was negative. Concern that glass looked similar to feed and chickens would ingest large quantities.

Crop and plant residues / Unknown

Grape marc pellets

Vitis vinifera

Not applied commercially in the chicken meat industry.

POTENTIAL HAZARDS: Organic chemical contaminants Biological contaminants

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Earth-based materials / Unsuitable

Gypsum (litter amendment)

Not applied commercially as a litter, it is used as a litter amendment. The results of trials using gypsum as a litter overseas were negative. Gypsum used as a litter amendment can decrease NH₃ nutrient loss. When used as a base and top-dressed with wood shavings it functions well but poses major potential health risks to workers (dust problems).

POTENTIAL HAZARDS: Possible human health concerns if used as a litter.

Crop and nut hulls / Unknown

Hazelnut hulls

Corylus spp.

Not applied commercially in the chicken meat industry. The results of trials conducted overseas were positive. Possible concerns: bird performance.

POTENTIAL HAZARDS: Biological contaminants

Crop and plant residues / Unknown

Hemp fibre

Cannabis sativa

Used as pet litter and horse bedding. Not commercially available in Australia, however this may change if hemp production increases.

POTENTIAL HAZARDS: Biological contaminants

Wood products / Unknown

Invasive native scrub (INS) chips or shavings – cypress

Product would be similar to wood chips trialled overseas. Cypress sawdust is already used in commercial chicken farms. INS is chipped or shaved hardwood, which means the most likely influencing factor will be chip/shaving size and the amount of contamination. Possible concerns: limited information.

POTENTIAL HAZARDS: Untested in Australian commercial chicken meat production.

Crop and nut hulls / Unknown

Macadamia hulls

Macadamia integrifolia

Not applied commercially in the chicken meat industry.

POTENTIAL HAZARDS: Biological contaminants

Crop and plant residues / Unknown

Marram grass

Ammophila arenaria

Not applied commercially in the chicken meat industry.

Litter type definitions

  • Crop and plant residues – these plant-based residues include stalk and leaf materials and may be produced specifically to be used as litter (e.g. grass-based straw or bamboo), or left over after harvesting (e.g. cereal or fibre crops).
  • Crop and nut hulls (also known as husks or shells) are the protective outer covering of a seed/kernel, legume, fruit or vegetable. They are usually composed of mostly indigestible silica and lignin.
  • Earth-based materials – includes materials such as sand, gypsum, bentonite and vermiculate.
  • Other materials – These are materials that do not fit the other categories, or may not have been previously used commercially as litter materials (e.g. sand). It also includes materials that are used as litter additives.
  • Mixed or layered materials are any mixture of litter types.
  • Paper materials – these are made from recycled paper, the pulp of wood or other fibrous substances. Can be shredded or pelletised to improve handling.
  • Re-used litter – these are litter that is used over multiple growth cycles.
  • Wood products include any compounds that come from trees or shrubs and are generally by-products of milling or production of other wood products. ‘Purpose produced’ wood products also exist.

Litter suitability definitions

  • Suitable – This material is very likely to be suitable for use as fresh bedding assuming that it is dry, friable and free of contaminants before chickens are reared on it. Some materials may require testing for contaminants or pre-treatment such as drying
  • Further research required – There is some support for the use of this bedding material, however it may lack suitable trial data to support its use.
  • Unknown – Suitability as a bedding material is currently unknown. A risk assessment, more information and testing is required.
  • Unsuitable – Information shows that this material is very unlikely to be suitable as a bedding material. Unsuitable litters may be too difficult and/or costly to use; and may be detrimental to bird health and welfare.