Tarwood (Loxostylis alata) is an evergreen, ornamental tree of the Anacardiaceae family that is native to South Africa. The main active ingredients include ginkgol and ginkgolic acid. The bark and leaves from L. alata have been widely used in South African traditional medicine to control labor pain and as an immune system booster.
50 to 200 mg/kg of L. alata extract was shown to be effective at reducing fungal pathogens Cryptococcus neoformans and Aspergillus fumigatus in chicks, with minimum inhibitory concentration (MIC) as low as 0.07 mg/ml. The addition of L. alata extract to chickens' diets can aid in the prevention or treatment of aspergillosis in poultry.
Caution: Administering greater than 300 mg/kg is toxic to chicks.