Valor nutricional da aveia branca IPR 126 sob diferentes níveis de nitrogênio

Abstract

The southern region of Brazil, subtropical climate, needs the forage productive and adapted to the climatic conditions of the region. For this reason, the use of cold season cultivated pastures is an alternative to reduce the critical period of forage production. Avena spp., is the most widely used forage for ruminants, why has good adaptability to climate and high nutritional quality. Evaluation systems of food should quantify the total carbohydrates (structural and non-structural) digested in the rumen. These systems are useful for the determination of the energy contribution of these fractions and varies according to the standards of rumen fermentation (food vs animal interaction) and to allow synchronization with other nutrients, particularly protein related to the Cornell Model. The field work will be conducted at the Federal Technological University of Paraná (UTFPR) - Campus Dois Vizinhos, UNEP Annual Crop in April to September 2013. The experimental area will consist of three plots of 24 m2 (3 x 8m), divided into three blocks, with spacing of 0.5 m between plots, totaling an area of 80 m2. Will be assessed the specie Avena sativa L., varieties IPR126, Guapa URS and Taura URS, comparing the accumulated biomass production and nutritional quality in each cutting period and in accumulated, as an indicator of bulk food for animals at grazing system. After deployment, will make a cut to achieve standardization of approximately 25 cm. The subsequent cuts were be made every 21 days for regrowth maintaining a height of 10 cm above the ground. The parcels were be subdivided into areas of 6m2 and each installment will receive a dose of 0, 60, 120 or 240 kg of N.ha-1. The chemical analyzes were be performed in the Laboratory of Food Science of UTFPR - Campus Dois Vizinhos. Include analyzes of Crude Protein (PB), Neutral Detergent insoluble Fiber (NDF), Acid Detergent insoluble Fiber (ADF), lignin, Neutral Detergent Insoluble Nitrogen (NDIN), Acid Detergent Insoluble Nitrogen (NIDA), determination of dry matter (DM), Mineral Matter (MM), Ether Extract (EE) and Total Digestible Nutrients (TDN). Differences were found between the doses of N only for the CP (p<0.05), which increased with increasing doses (22.01, 24.56, 25.51 and 26.21% of CP for assay 0, 60, 120 and 240 kg of N.ha-1, respectively). In addition, there was a linear relationship between these variables (p=0.006). Increased levels of nitrogen fertilization resulted in increasing values of CP, demonstrating the potential for improving animal performance during the winter, both for meat production, as for milk.