Bacillus subtilis’ effect on ammonia emissions in broilers
New research reveals that using a Bacillus-based probiotic can help reduce ammonia emissions from broiler excreta. This not only helps to reduce the negative impact on the environment but also has health benefits for the birds and farm staff welfare.
BY JEAN-CHRISTOPHE BODIN, MSC, AGR., SR. PRODUCT MANAGER POULTRY, CHR. HANSEN
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ver the past decades, the poultry sector’s growth and trends toward intensification and concentration have given rise to environmental concerns. A direct consequence of these
structural changes is increased production of waste, which could result in environmental implications. An increase in waste by-products may correspondingly become an issue. Both local neighbourhoods and the internal environment of production facilities can be affected. For example, an increase in ammonia levels can be detrimental for birds (conjunctivitis) and workers in the farm (respiratory issues).
Reducing gas emissions with Bacillus subtilis The objective of this study was to evaluate the effect of a Ba- cillus based probiotic Bacillus subtilis DSM17299 – GalliPro (or GalliPro Max in some markets) on ammonia emissions (NH3
)
in broiler excreta. Three different nutritional density formula- tions were compared. Each of them was compared with or without the use of GalliPro. A total of 816, 1-day-old Ross 308 broiler chicks were selected in a six-weeks feeding trial. Birds were randomly distributed to one of the six dietary treatments (eight replicate pens/ treatment with 17 birds/replicate pen). A factorial experimental design was used with three levels of metabolisable energy (ME) and crude protein (CP): 100% ME and CP (T1+T2), 98.8% ME and CP (T3+T4), and 97.6% ME and CP (T5+T6) with constant amino acid levels. Treatments 2, 4, and 6 were supplemented with 500 g/tonne (1 lb/ton equivalent) of a Bacillus subtilis- based probiotic (Bacillus subtilis DSM17299 – GalliPro), a target inclusion of 8×105
cfu/gram of feed. Experimental diets used were corn, wheat and soybean meal based.
• At the end of the trial, excreta samples were collected from each pen and stored in plastic boxes in duplicates.
0
100%
100% + GalliPro
GalliPro
34
GalliPro
• Fermentation took place for a period of five days at room temperature (25°C/77°F) • Ammonia (NH3
) emissions were measured with a Gastec
(model GV-100) gas sampling pump (Gastec Corp., Kanagawa, Japan).
▶ SUSTAINABILITY AND WELFARE | OCTOBER 2020
NH3 (ppm)
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