Pellet Granulation 6 mm vs 8 mm – Impact on Comfort and Hygiene in Animal Housing
Selecting pellet diameter directly affects absorption, dust levels, and the microclimate (ammonia, humidity), as well as the economy and ergonomics of bedding application. Below we present practical recommendations for poultry farms, stables, and agricultural facilities.
In brief (for decision‑makers):
- 6 mm – activates and loosens faster, better “locks in” moisture with more frequent top‑ups; preferred in high‑density poultry houses and where quick absorption activation is important.
- 8 mm – breaks down more slowly, retains structure and resilience longer; valued in stables and stalls (horse comfort) and where lower dust formation is important during intensive use.
- Both sizes can be combined (e.g., 6 mm for “start” and 8 mm for “maintenance”), depending on the production cycle and ventilation system.
How granulation affects key parameters
- Absorption and activation: Smaller pellets have more surface area, open up faster, and take in moisture more quickly at the start of bedding.
- Structure and comfort: Larger diameter retains granule form longer → a more “springy” bedding mat, preferred in horse stalls and for thicker bedding layers.
- Dust levels: Excessive mechanical grinding of small pellets can increase dust; proper dedusting and application minimise this.
- Microclimate (NH₃, humidity): Fast activation of 6 mm helps reduce moisture spots; the more stable structure of 8 mm supports even bedding ventilation.
- Economy and ergonomics: Pellet size affects the frequency of top‑ups, spreading speed, and total labour input.
6 mm vs 8 mm – practical comparison
| Criterion | Pellet 6 mm | Pellet 8 mm |
|---|---|---|
| Start of absorption | Quick “start”, bedding loosens quickly. | Slower start, granules last longer. |
| Bedding structure | Looser, mixes faster with the top layer. | Stable, springy, comfortable for longer‑term bedding. |
| Dust levels | Low with correct application; more sensitive to over‑mechanisation. | Usually very low, good resistance to abrasion. |
| Poultry farming | Excellent for high stocking density and sensitive early phases. | Works well in the maintenance phase and longer cycles. |
| Stables / horses | Good option for frequent top‑ups and bedding refresh. | Preferred for comfort and resilient bedding. |
| Handling & spreading | Convenient for manual application and smaller augers. | Convenient in mechanical systems, less likely to “escape” from augers. |
| Packaging options | 15 kg bags and 1000 kg Big Bags. | 15 kg bags and 1000 kg Big Bags. |
Choosing granulation for species and systems
- Broilers / laying hens: 6 mm for the start (fast activation, moisture control), 8 mm later for structural stability. Many farms use a mixed model.
- Horses: 8 mm provides springy, comfortable bedding with low dust; 6 mm – if you prefer smaller, more frequent top‑ups and faster activation.
- Cattle: Both sizes work depending on the bedding and ventilation system; 8 mm is often chosen where stronger structure is required.
- Ventilation & humidity: In higher humidity, 6 mm absorbs faster; with optimal airflow, 8 mm maintains an “air cushion” longer.
A/B testing protocol in one facility
- Select two comparable sectors (same stocking density, feed, ventilation).
- Apply 6 mm in sector A and 8 mm in sector B (or mixed vs uniform granulation).
- Monitor: bedding moisture (spot checks), smell (NH₃ – observation and sensors if available), dust during work, top‑up frequency, animal comfort (behaviour, sores, chafing).
- After the cycle, compare total usage, labour time, and staff feedback.
Most common mistakes and how to avoid them
- Over‑mechanisation – excessive pellet abrasion increases dust; adjust speeds and augers.
- No adjustment to conditions – humid seasons and weaker ventilation need faster activation (often 6 mm or a mixed approach).
- Single heavy application – smaller, more frequent top‑ups and spreading work better than rare, heavy fills.
- Ignoring animal signals – slipping, sinking, surface crusting, or ammonia smell indicate the need to adjust bedding system and/or granulation.
Bro‑Eko delivery options: straw pellets 6 mm and 8 mm, packaging: 15 kg bags and 1000 kg Big Bags. We match granulation and packaging to your production cycle and on‑site logistics.
Want help choosing the right granulation for your facility?
Call: +48 506‑507‑472 or email: bronkowskilukasz@bro-eko.com – we advise based on stocking density, ventilation, and cleaning schedule.
FAQ (short)
Can I mix 6 mm and 8 mm?
Yes. A common practice is starting with 6 mm (fast activation) and switching to 8 mm (stable structure).
Is larger diameter always less dusty?
Usually yes during mechanical work, but key factors are dedusting quality at production and correct application.
How to choose packaging?
1000 kg Big Bag – for large facilities and mechanical application; 15 kg bags – for smaller farms and flexible top‑ups.