Effect of selective grazing upon beef production in an irrigated pasture mixture

Ignacio Ruiz N.1, Marcos Figueroa R.2 Germán Klee G.3

During two consecutive grazing seasons, a white dover (Trifolium repens L.) perennial ryegrass (LoIium perenne L.) pasture was subjected to the following two treatments: I. Selective-residual (S-R) grazing, where 500/o of the steers, or selective group (S), grazed each paddock during two days, and the other half grazed the residue (R) for another two days. II. Normal grazing (N), with only one group of steers grazing each paddock during four days, in rotation. Relativo daily gains of steers were 100, 120 and 93, for the N, S, and A groups. Daily gain in group S was significantly higher (P < 0.05) than i,n the other two groups. Liveweight output per hectare and prof it did not differ greatly between treatments.

1 Instituto de Investigaciones Agropecuarias (INIA), Casilla 5427, Santiago, Chile.
2 Escuela de Agronomía, U. de Concepción,Casilla 537, Chillán, Chile.
3 Estación Experimental Quilamapu (INIA), Casilla 426, Chillán, Chile.