There is a lot of research on the beneficial effects of garlic on poultry. It improves growth, feed efficiency, egg production and quality, stimulates the immune system and lowers blood cholesterol levels.
Adding garlic powder to the diet (0.6 kg per 20 kg) of poultry can reduce the smell of manure.
“It makes the poultry house smell like a pizzeria instead of manure,” said vet Glenn Birrenkott of Clemson University. People also preferred the ‘garlic’ eggs, saying they had a milder flavour than ‘normal’ eggs, and did not taste of garlic.
Birds gain the most benefit of garlic’s active ingredient allicin if it’s fed fresh, preferably minced or crushed. After 24 hours, the allicin loses its antimicrobial effect ( you smell it as a strong ‘garlic’ aroma).
Dose: Offer fresh, crushed or chopped raw garlic daily (don’t mix it into feed); or add one crushed clove per litre of fresh water. Replace daily. Birds may initially not like the smell or flavour of garlic in water. Ensure they have an alternative, fresh water supply or add a little garlic and slowly increase the dose over time.
It’s best to feed fresh garlic, preferably crushed or minced