摘要：It is intended to verify the relations between input and products concerning to replaceability or complementarity, as well as the impacts of monthly variations on product prices (milk and meat) and input (fuels, work, concentrate) in the production system in Brazil that possess cows of 2.000 to 3.000 kilograms of milk for nursing. The results show that monthly variations in prices paid or received by producers cause considerable monthly changes in the markets for milk and the input considered.
