Estabilidade e composição bromatológica de silagem de grãos de sorgo em função de reidratação e uso de inoculante

Abstract

Brazilian livestock, with emphasis on ruminant animals, is one of the most important economic and social activities. However, the feeding of these depends on strategies capable of improving nutritional efficiency. Therefore, the objective of this work was to evaluate the effects of different levels of rehydration and the use of enzymatic-bacterial inoculant in sorghum grain silage on aerobic stability and chemical composition. The design used was completely randomized, in a 4 x 2 factorial, with eight replications. The treatments consisted of four levels of humidity (25; 30; 35 and 40 %), without and with the use of an inoculant. The silages with 30, 35 and 40 % moisture showed greater stability. All treatments showed constant temperatures up to 48 h of aerobic exposure. After this period, there was an increase in humidity levels of 25 and 40 %, with a break in aerobic stability after 96 hours. The silages with 25% moisture had the highest pH values (without and with inoculation). For dry matter, increases in moisture levels every 1 % promoted a reduction in this variable of 0.87 %. For neutral detergent fiber corrected for ash and proteins, there was a quadratic effect with a minimum point of 7.66 % in humidity of 38.21 %. For total digestible nutrients and non-fibrous carbohydrates the best levels of water inclusion were 39.71 and 39.41%. The use of the inoculant increased crude protein levels at all moisture levels and reduced in vitro dry matter digestibility at 25 % moisture. The production of good rehydrated sorghum grain silage is possible with moisture levels between 30 and 40 %. The use of bacterialenzymatic inoculant does not improve the stability of reconstituted sorghum grain silages.