The exercise was an experiment carried out by the Peth Lanna community enterprise, and Chiang Mai University’s Faculty of Agriculture.

The Peth Lanna community enterprise president Sirin Chaemthet reportedly said that the chickens developed a higher immunity against disease after consuming cannabis.

The farmers decided to use cannabis after antibiotics failed to prevent their chickens from developing avian bronchitis.

Ms Sirin reportedly added that the cannabis-fed chickens would meet customer demands for organic food.

National Farmers Council president Prapat Panyachatrak was quoted as saying that using cannabis instead of antibiotics would ensure consumer safety and “boost the commercial value of chicken products”.

Thailand last Thursday became the first country in Asia to decriminalise cannabis.

This means it is no longer illegal to grow and trade marijuana and hemp products, or use marijuana for health purposes.

On the same morning the law came into effect, over 100,000 people registered with Thailand’s Food and Drug Administration, Bangkok Post reported.

However, Thai health minister Anutin Charnvirakul warned that recreational use of marijuana was still prohibited.

“If (tourists) come for medical treatment or come for health-related products then it’s not an issue but if you think that you want to come to Thailand just because you heard that cannabis or marijuana is legal ... (or) come to Thailand to smoke joints freely, that’s wrong,” Mr Anutin told CNN.