Abstract

The aim of this research was to assess the chemical composition of Brachiaria brizantha cv. Piatã variety and to determine which cutting frequency is the most suitable for autumn, winter and spring. The experimental design adopted was the completely randomized in factorial scheme with plots subdivided in time. Each plot consisted of four cutting frequencies (21, 28, 35 and 42 days between cuts) and sub plots were the three seasons (autumn, winter and spring) with 12 replicates per treatment (experimental units). The assessed parameters were; crude protein content, neutral detergent fiber, lignin and in vitro organic matter digestibility. No significant differences were observed in crude protein content between the cutting frequencies of 21, 28 and 35 days for autumn and winter; only the cutting frequency of 42 days showed the lowest values. The cutting frequency of 35 days showed higher crude protein and digestible organic matter for autumn and winter. As for the spring season, the cutting frequency that showed higher production of crude protein and digestible organic matter was 28 days.

Key words: Animal nutrition, pastures, Brachiaria brizantha.