Description
What it is. Duddingtonia flagrans NCIMB 30336 is a nematophagous fungus. The feed additive is a solid preparation containing at least 5 × 10^5 viable chlamydospores per gram of additive, obtained from a selected fungal strain.
What it is for. It belongs to functional group 4d (other zootechnical additives) and is authorised exclusively for grazing animals: dairy cows and dairy cows of minor bovine species, dairy ewes and goats, as well as cattle, sheep, goats, camelids, cervids, equines, pigs and rabbits kept on pasture other than for milk production. The chlamydospores act in the faeces of treated animals, where the fungus traps and reduces infective nematode larvae, which may help lower pasture parasitic pressure. A related safety study (BioWorma®) illustrates this use in dairy cows but does not set a recommended use level.
Points to watch. Use is restricted to grazing animals only; minimum use levels and maximum contents for authorised species/categories are fixed in the regulatory annex and vary by category, so the applicable figure must be checked per species before formulation. Storage conditions and heat-treatment stability must be stated in the instructions for use, and personal protective equipment (respiratory and skin protection) is required when risks cannot be managed through operating procedures.
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