ESTABILIDADE AERÓBIA DE SILAGEM DE PALMA FORRAGEIRA ADITIVADA COM UREIA E FARELO DE TRIGO

Abstract

Aimed to evaluate the effects of adding wheat bran and urea on the aerobic stability of silage forage cactus by evaluating the chemical composition after exposure to air, pH, ammonia nitrogen, organic acids and temperature. The experiment was conducted at the Forage Laboratory of the Federal University of Paraíba in Areia. We used a completely randomized design arranged on a 4x2 factorial design, which consisted of four levels of wheat bran (0, 5, 10 and 20% of natural material), with or without urea, with four replications. In the case of wheat bran dry matter is presented in a linear manner (P <0,05) with increasing levels of bran. The organic matter was quadratically (P <0,05). For ammonia nitrogen (NH3-N) there was a quadratic effect (p <0,05). With respect to urea, there was an increase (p <0,05) in DM content in silage treated with urea. For the values of MO, the results were similar to those of MS. For values of NH3-N was observed an increase (p <0,05) in silage containing urea. Silage palm without the addition of urea and wheat bran showed the highest (p <0,05) pH value (7,08). For silage without the addition of urea there was a linear decrease (P <0,05). Higher values (P <0,05) crude protein in silages that had the interaction of urea with wheat bran were found. There was no significant effect (P> 0,05) for the variables average temperature, maximum temperature and time to reach maximum temperature and rate of rise for the treatments with added urea. For lactic acid, acetic acid and butyric acid had no effect (P> 0,05) in the silage treated with urea. The propionic acid appeared quadratically (P <0,05). The additive silage with urea and 10% level of wheat bran was the most stable. The addition of 10 and 20% wheat bran combined with urea ensures greater aerobic stability of silage forage cactus.