Effect of application rate of sodium nitrite and hexamine on the fermentation and the chemical composition of guinea grass silage harvested at different stages of maturity - Moraes, A; Auerbach, H. U; Bragatto, J. M; Piran Filho, F. A; Silva, S. M. S; Nussio, Luiz Gustavo; Jobim, C. C; Daniel, J. L. P (Animal Feed Science and Technology, 2023)