Urea is the principal component of urine?
The principal component of urine is urea. It is the main nitrogenous breakdown product of protein metabolism in mammals, during cellular respiration.
The main nitrogenous waste in all mammal urine is Urea (CH4N2O). Cat urine is highly concentrated. This means that it also has a higher amount of urea in it. When urea decays it produces amines (NH4 = ammonia) first then mercaptans (found in skunk spray). So, at first, the urine is odorless, but as it decays, it breaks down into ammonia