Adding 3.5% linseed oil to layer chicken feed results in egg yolks with 15.6% omega-3 fatty acids and an omega-6:omega-3 ratio of 1.00, but also reduces how much feed the chickens eat and increases...

We analyzed the available evidence and found that adding 3.5% linseed oil to chicken feed is associated with higher omega-3 levels in egg yolks and a lower omega-6:omega-3 ratio compared to 2.5% linseed oil. Specifically, one assertion shows that 3.5% linseed oil led to egg yolks containing 15.6% omega-3 fatty acids and an omega-6:omega-3 ratio of 1.00, while 2.5% did not reach that level [1]. The evidence we’ve reviewed so far consistently supports this pattern, with 17 studies or assertions pointing to the same outcome and none contradicting it. However, this increase in omega-3 content comes with trade-offs: chickens fed 3.5% linseed oil ate less feed overall and required more feed per egg produced, which raises feeding costs. We don’t know if these changes in feed intake or cost are large enough to affect farm profitability, or whether the higher omega-3 levels in eggs translate to measurable health benefits for people eating them. The evidence doesn’t explain why feed intake dropped or how long these effects last. What we’ve found so far suggests that increasing linseed oil from 2.5% to 3.5% may improve the fatty acid profile of egg yolks, but it also changes how chickens eat and how much it costs to produce each egg. More research would be needed to understand the full impact on hen health, egg production, and long-term cost-effectiveness. If you’re looking to boost omega-3 in eggs, 3.5% linseed oil may help — but it could also mean spending more on feed and getting fewer eggs per pound of food.