Ignacio Ruiz N.1, Iván Franco P.2, Ernesto Jahn B.3, Germán Klee G.4 y Marcos Figueroa R.5

Informatin related to an economical analysis of eight beef production systems developed at Chillan, Chile, is presented. the systems are based in the use of early spring-born Holstein calves. Such systems are grouped in two main categories: a) Steers raised from 8 to 20 months of age. In this case the steers are mantained in the systems during one year, starting in May. There is no winter fattening during the 20-24 months of age-period; steers are taken off the system before they reach market weight; the final fattening is supposed to be done in a different place, b)Steers raised from 8 months of age until market weight (500 Kg); in such situation, animals are fed a fattening ration durin the second winter.
The economical analysis, made the prices valid during the first weeks of June andn November, 1973 respectively, shows that the systems which raise steers only until 20 months of age are much more profitable to the producer than those systems based in steers sold at 500 Kg of live weight; this is valid both for the net income per animal and per hectare, and also for the investment capita's rentability. A sale price sensibility analysis for different rentability rates demand to the capital is also included.

1Ing. Agr., M. S., Ph. D., Estación Experimental Quilamapu, Instituto de Investigaciones Agropecuarias (INIA). Casilla 426, Chillán, Chile. Profesor, Universidad de Concepción de Chile.
2Ing. Agr., Egresado del Programa Postgrado Economía Agraria, Universidad Católica, Estación Experimental Quilamapu, Chillán.
3Ing. Agr., M. S., Subestación Experimental Humán, Los Angeles, Chile. Actualmente en VPI y S.U., Blacksburg, Virginia.
4Ing. Agr., Subestación Experimental Humán, Los Angeles.
5Ing. Agr., M. S., Estación Experimental