Produção animal e comportamento ingestivo de bovinos em sistema integrado de produção agropecuária

Abstract

This trial aimed to assess animal performance and producti on in a mixture pasture of black oat and annual ryegrass in an integrated crop-livestock system by means of a 2x2 factorial experiment replicated in three randomized blocks. The plots consisted of two canopy heights (10 and 25cm) kept by conti nuous grazing and submitt ed to two-nitrogen ferti lizati on (NP – nitrogen applied on pasture in autumn ti me; and NG – nitrogen applied on corn crop in springti me). The total amount of nutrients applied over the year was the same for all treatments. Forage nutriti ve value, herbage allowance, forage mass, and pasture carrying capacity increased with nitrogen applicati on (urea – 45% N) on pasture, with no eff ect on animal performance, resulti ng in higher animal producti on per area. Lower sward canopy height led to lower forage mass, longer grazing diurnal ti me, and shorter ruminati on diurnal ti me.