Sentence:  This article assumes that the rations you are feeding your beef , dairy cattle , and sheep are adequately balanced with <WSD>protein</WSD> , vitamins , and minerals . 
Meaning of the word marked with <WSD> tags:  any of a large group of nitrogenous organic compounds that are essential constituents of living cells; consist of polymers of amino acids; essential in the diet of animals for growth and for repair of tissues; can be obtained from meat and eggs and milk and legumes