Why do high levels of free fatty acids (rancidity) in feed oils and fats reduce egg production and shell quality in brown layers?

Lipids (vegetable oils and animal fats) are added to layer feeds to increase energy density and supply essential fatty acids like linoleic acid, which dictates egg size. However, if these oils are stored improperly under high summer temperatures in regions like Multan and Bahawalpur, they undergo oxidative rancidification, producing free fatty acids (FFAs), aldehydes, and toxic peroxides. These peroxides are highly reactive; they physically attack and oxidize fat-soluble vitamins (specifically Vitamin A, D3, and E) inside the feed bag, rendering them biologically inactive. A deficiency of Vitamin D3 instantly halts calcium absorption, while intestinal absorption of carotenoid pigments drops due to local enteritis (gut inflammation) caused by the toxic peroxides. This results in a sudden drop in egg yield, pale yolks, and extremely thin, fragile brown shells. Incorporating synthetic antioxidants (like BHT or ethoxyquin) and purchasing low-FFA oils is mandatory. Farmers can consult feed lipid biochemistry in the Poultry Encyclopedia, buy feed-grade stabilizers and oils on Poultry Plaza, check raw material prices on Poultry Rates, and trade on Murghi Mandi.