S. Rebollar-Rebollar, R. R. Posadas-Domínguez, J. Hernández-Martínez, R. Rojo-Rubio, F. J. González-Razo, E. Guzmán-Soria


The feedlot cattle producers in the south zone of the State of Mexico, generally does not an correct planning of sale to the market of yours finished hooky. Likewise, they lack a technical and administrative managing in his productive units, focused with the efficient use of inputs, which has prevented that they maximize her monetary earnings. The present research was realized to estimate the levels technical (TOL) and economic optimal (EOL) in feedlot cattle, using two cubic functions of production with diminishing marginal returns. There was in use 100 hooky Bos taurus x Bos indicus. Alive weight-LW to beginning of the fattens of 290 ± 15 kg, age 21 to 24 months fattened in feedlot during 93 days consuming a diet totally mixed (Protein: 133.33, FDN: 237.44, FDA 114.33 g/kg MS and 2.62 MS's Mcal/kg of metabolisable energy). To estimate the both functions (TOL and EOL), the profit of weight was considered to be a dependent variable. For the first production function the food consumption was taken as an independent variable and in the second the time defined in days. For the first production function the TOL was of 475.04 and the EOL was of 473.94 kg of LW; with a food consumption of 12.58 and 12.36 kg/day. For the second production function the TOL it was 475.01 and the EOL of 460.21 kg of LW, with a period of 93.29 and 77.21 days. The ideal point of sale and the maximum profit is obtained by the second production function, when the animals they come an LW of 460.21 kg during a food period of 77.21 days


beef cattle; production functions, technical optimum, economic optimum

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