Composição e valor nutricional de feno e silagem de estilosantes CV. Campo Grande

Abstract

The objective was to evaluate the productivity of the Stylosanthes spp. cv. Campo Grande (ECG) and the potential for use in conservative form, through the main quantitative and qualitative losses resulting from production processes and storage. Two experiments were conducted, one with another with hay and vacuum silages. The experiment consisted with hay, to first order, the assessment of production per area as well as the ratio leaf: stem presented. After, there was the making of hay, evaluating three levels of dry matter (DM) at the time of baling: 600 g/kg, 700 g/kg and 800 g/kg in fresh matter (FM). Data were analyzed using completely randomized design. It was observed that the ECG has good productive potential (3.36 t/ha ofFM), associated with a leaf: stem ratio of 0.6, sl ightly below the range normally found between pulses of the same species. Hays had good quality, even with a rise in temperature inside the bales, higher than the ambient temperature at 10DC (for hay with 600 g DM/kg FM). Satisfactory values of composition were found, especially regarding the content of crude protein (CP), neutral detergent fiber (NDF), acid detergent fiber (ADF), neutral detergent insoluble nitrogen (NIDN), acid detergent insoluble nitrogen (NIDA), lignin and the A+Bj, B2 and C fractions, components of total carbohydrates (TCH), which conferred higher levels of total digestible nutrients (TDN) and "in vitro" dry matter digestibility (IVDMD) in ECG hays. The hay made from 700 g DM/kg FM excelled the others (P<0.05), with higher values of IVDMD and TDN, 528.52 and 646.34 g/kg DM, respectively. In the experiment with silage, we evaluated the composition and nutritional value of ECG silage, subjected to 4 (four) treatments: control, with biological inoculant, with biological inoculant plus urea and only with urea, with 4 (four) opening time each: 14, 28, 42 and 56 days, in a completely randomized design with factorial scheme 4 x 4. In the experiment with ECG silage, there were the best feature of pH, temperature and composition in untreated silages with additives (P<0.05), as well as best IVDMD and TDN values, with mean values of 539.17 and 665.39 g/kg DM, respectively. The ECG has good potential to be used in the form of hay or silage.