In order to study the influence of the economicfactor on the objectives used to select the animals, production data of a paymentprogram by milk quality implanted by a milk industry of Rio Grande do Sul wereused. The criteria of quality of the referred program consisted of minimum contentsof 3.1% of fat, 2.85% of protein and a maximum 500,000 units of somatic cells.The data were stratified in three levels, in agreement with the volume of milkreceived monthly by the industry from the properties, due to significant differencesin relation to the production costs by liters of milk, resulting from the productioncapacity of the properties. Level 1 included the production of the propertiesthat delivered up to 1,500 liters of milk for month, Level 2, the productionbetween 1,501 and 3,000 liters and Level 3, the ones that delivered above 3,000liters. The revenues of the components by liter of milk varied due to the allowancereceived for the volume of milk delivered, obtaining higher values for largervolume. The expenses led to the economic value (R$) for the milk componentswhere production costs in different levels generate different functions of theincome. The economic values for the components were of -0.4290; -0.1906 and-0.3772 for fat, -0.0624; 0.0836 and -0.0193 for protein, at levels 1, 2 and3 respectively; the carrier always presented positive economic value. Also,these values where higher than the other components, showing values 0.1964;0.2093 and 0.2210 at Levels 1, 2 and 3 respectively.
