Brown Seaweed

Ascophyllum nodosum

Brown seaweed

Other Names:

Norwegian Sea Kelp, Laminaria Digitata, Sea Vegetable, Sea-Weed, Sea Frond, Atlantic Seaweed


  • Antiparasitic
  • Antibacterial
  • Anti-inflammatory
  • Immunity
Sea kelp (Ascophyllum nodosum) is a type of brown seaweed known to contain high amounts of phlorotannins and ascophyllan. Phlorotannins may be able to inhibit starch and lipid absorption and ascophyllan is thought to have immunostimulatory properties. Specific applications studied in poultry include:
  • Ethnoveterinary uses: In British Columbia, sea kelp is given as a supplement in chick starter rations to prevent disease.
  • Antibacterial: Sea kelp powder may be helpful in reducing the presence of Escherichia coli.

Poultry Specific Studies

TypePlant PartDosageSpecific useResultsRef
Chickensextract1-2 mL in drinking waterantioxidant, heat stresssignificantly increased (P < 0.05) the AFI, ABWG, and AWI of broiler chickens irrespective of heat stress.F Akinyemi et al., 2022
Chickens0.05% of feedheat stressreduced the effect of prolonged heat stress while not negatively affecting growth and feed conversion.E Sobotik et al., 2018