جستجوی مقالات مرتبط با کلیدواژه « تابع کاب داگلاس » در نشریات گروه « علوم پایه »

The purpose of this study was to analyze the trend of energy consumption and greenhouse gas emissions in the milk production process in 25 dairy farms. The required information was obtained through a specialized questionnaire with unit managers and operators in 1399 in Ivan city. The total input and output energies per head were estimated to be 536.79 and 599418.37 MJ per each head. Energy indices including efficiency, productivity and energy intensity for cattle were 1.11, 0.15 kg/mJ and 6.45 MJ/kg per cow, respectively. The results of Cobb Douglas function showed the effect of manpower energy inputs, machinery and animal feed equipment with regression coefficients of 0.18, 0.02 and 1.01, respectively, on milk yield per positive livestock. And the effect of fossil fuel and electricity inputs on negative performance were calculated with -0.04 and -0.05 regression coefficients, respectively. The total emissions from greenhouse gas emissions of dairy farming breeding units were 601.32 kg of carbon dioxide per cow, the highest amount was related to diesel fuel input with 66.5%.