Respuesta de ovinos a pastizales creciendo en diferentes cobertura de copas en sistemas silvopastoriles de ñire (Nothofagus antarctica) en Patagonia Sur, Argentina

PERI P.L.

ZOOTECNIA TROPICAL

CENTRO NACIONAL DE INVESTIGACIONES AGROPECUARIAS (INIA-CENIAP)

Lugar: Venezuela; Año: 2008 vol. 26 p. 363 - 366

0798-7269

Sheep production is the main annual income in silvopastoral systems in southern Patagonia forest (Argentina). The aim of the present work was to quantify sheep performance grazing under two crown cover (40 and 60%) in Nothofagus antarctica silvopastoral system and two post-grazing pasture masses (optimum 850 kg DM/ha and low 300 kg DM/ha). Liveweight gain/head (LWG, gr/head/d) and liveweight gain/ha (kg/ha/d) of four years old ewes (17 and 26 ewes/ha for 60% and 40% crown cover, respectively) were recorded during December (maximum biomass production). Instead in both crown cover stands there was no difference in LWG per head, this decreased up to 50% for ewes grazing until a low post-grazing mass. The highest pre-grazing mass in the 40% crown cover silvopastoral system allowed a higher stocking rate (26 ewes/ha) and consequently a greater LWG per ha (3.8 vs. 2.4 kg/ha/d for optimum post-grazing mass).