Cellulase for Animal Feed — Breaking Down Non-Starch Polysaccharides for Improved Digestibility in Poultry, Swine, and Ruminants

Cellulase enzyme improves FCR in poultry by hydrolyzing the cellulose and mixed-linkage polysaccharides in plant cell walls of feed ingredients, releasing nutrients — particularly starch, protein, and lipids — that are physically enclosed within intact plant cells. This increases the proportion of dietary nutrients that are absorbed rather than excreted. Cellulase also contributes to reducing the anti-nutritional effect of cell wall NSP on intestinal digesta viscosity, particularly in wheat and barley-based diets where soluble NSP creates viscous conditions that slow nutrient absorption. The combined effect is higher apparent metabolizable energy (AME) and improved amino acid digestibility, translating to better growth rate at the same feed intake — the definition of improved FCR.

Standard cellulase enzyme from Trichoderma reesei or Aspergillus niger is partially sensitive to the heat and moisture of feed pelleting, which typically operates at 70–90°C conditioner temperature and produces pellet temperatures of 80–88°C. Activity loss during pelleting is typically 20–40% for standard grades at 85°C. Thermostable cellulase grades — produced with modified fermentation or protective coating — retain 60–80% of activity through standard pelleting. For feed applications requiring consistent post-pelleting enzyme activity, buyers should specify thermostable grade and request post-pelleting activity assay data from the supplier. Liquid enzyme post-pelleting addition (spraying) is an alternative that avoids heat exposure entirely.

Feed-grade cellulase for animal nutrition must meet additional requirements beyond industrial cellulase: food/feed safety certification (absence of mycotoxins, heavy metals, pathogenic organisms), compliance with feed enzyme regulations (EU Regulation 1831/2003 in Europe, AAFCO in the USA, or national feed enzyme regulations in other markets), and demonstrated efficacy and safety for the target species. The enzyme's activity specification may also differ — feed enzyme activity is often expressed in substrate-specific units (FPU, CMCase, or NFU for NSP applications) rather than the general U/g used in industrial applications. We supply both industrial and feed-grade cellulase; specify your use and target market for the appropriate grade and documentation.

Yes. Cellulase is routinely combined with xylanase, beta-glucanase, pectinase, protease, and phytase in multi-enzyme NSP complexes for poultry and swine diets. The combination is synergistic because different cell wall polymers require different enzyme specificities: cellulase degrades cellulose, xylanase degrades arabinoxylans, beta-glucanase degrades mixed-linkage beta-glucans, and pectinase degrades pectin. Together, these enzymes provide more complete cell wall hydrolysis than any single enzyme alone. Enzyme compatibility in the formulation should be verified — pH and temperature optima should overlap sufficiently for all components to be active simultaneously in the target section of the GI tract.