Veil is not aged because it doesn't have enough fat cover to protect it from dying out.
Veil is a kind of meat obtained from the calves of age of just 6-8 months or even younger. Generally the male calves that re not used for breeding are preferred for veil. Selling the meat of calves is a way of generating revenue from the calves that are of no other use.
Fats are the lipid molecules consisting of glycerol molecule as backbone with 2 fatty acid chains and a phosphate group. Fats are also deposited inside the body of an organism. These are a source og bulk of energy.
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