“…Many studies on the dairy cattle sector use the same input and/or output variables in their efficiency models. Indicatively, gross revenue has been used as output by Náglová and Rudinskaya [18], Theodoridis et al [19], Theodoridis and Ragkos [23], Mitsopoulos et al [25], and Spička and Smutka [34]; human labor has been used as input in Alvarez and Arias [17], Náglová and Rudinskaya [18], Madau et al [21], Theodoridis and Ragkos [23], Siafakas et al [24], Mitsopoulos et al [25] and Areal [35]; while variable capital cost and fixed capital cost have been used as inputs by Alvarez and Arias [17], Náglová and Rudinskaya [18], Madau et al [21],. Theodoridis and Ragkos [23], Mitsopoulos et al [25], Areal [35] and Kovács and Szücs [36].…”