Estabilidade aeróbia de silagem de sorgo consorciado com gramíneas tropicais ; Aerobic stability of sorghum silage interceded with tropical grasses

The objective was to evaluate the aerobic stability of sorghum silage intercropped with tropical grasses. The study was conducted in a completely randomized design, with 5 treatments and 4 replications, totaling 20 experimental units, represented by microsilos. The treatments correspond to: (1) sorghum monoculture; and consortiums of sorghum with Brachiaria species: (2) sorghum + marandu; (3) sorghum + paiaguás; (4) sorghum + Ipyporã and (5) sorghum + Dunamis. To analyze aerobic stability, subsamples of 1.5 kg of silage from each treatment were used, where it was separated and stored in polypropylene buckets with a capacity of 12 kg, in a closed place with room temperature controlled at 25°C using a thermometer. digital, and the silage temperature was measured every 6 hours using a digital contact thermometer over a period of 72 hours. Aerobic stability was calculated as the time in hours for the silage, after opening the silo, to raise its temperature by 2 ºC above the average ambient temperature). There were significant differences in opening temperature, maximum temperature, time to maximum temperature and maximum pH. There were significant differences in the opening temperature of the silos, where higher temperatures were observed for the Monoculture and Marandu treatments (23.88 °C and 23.58 °C, respectively) and lower temperatures for the Dunamis treatment (22.80 °C). The time required for silage stability to break varied between 30 and 48 hours, with the Monoculture treatment being the first to reach breakage. Due to this, the silage from the Monoculture treatment reached the maximum temperature (37.45 °C) in 37.5 hours of exposure to oxygen. Therefore, it is concluded that silages mixed with tropical grasses have greater buffering power than monoculture silage, making stability last longer, reducing the development of harmful microorganisms such as yeast. ; Objetivou-se avaliar a estabilidade aeróbia da silagem de sorgo consorciado com gramíneas tropicais. O estudo foi conduzido em delineamento ...