The objective of this experiment was to evaluate dry matter production, in vitro dry matter digestibility, variation in chemical composition and in macro and micro mineral contents in Pensacola bahiagrass (Paspalum notatum Fluegge var. saurae Parodi) as related to cutting age. The experimental design was completely randomized with six treatments, replicated five times. Treatments consisted of six cutting ages spaced 15 days apart, with the first cut made 20 days after staging. Dry matter production increased quadratically (P < 0.05) with increased age. In vitro dry matter digestibility and crude protein concentration decreased quadratically (P < 0.05) with increased age. Conversely, neutral detergent fiber increased quadratically (P < 0.05), whereas acid detergent fiber concentrations varied cubically (P < 0.05). Concentrations of the phosphorus, calcium, magnesium and sulfur decreased quadratically (P < 0.05), whereas potassium concentration varied cubically (P < 0.05) with increased age. Concentrations of copper and zinc decreased quadratically (P < 0.05), whereas that of manganese increased quadratically (P < 0.05). Results showed that the recommended cuttings should be performed in day 30 intervals, in order to garantee, if one seeks a good digestibility, adequate protein and mineral contents.
Paspalum notatum; chemical composition; cutting age; pasture
