The objective was to analyze the effect of aerobic exposure time of relocated forage sorghum
(Sorghum bicolor (L.) Moench) silages and addition of urea levels in sorghum silages with
aerobic exposure, through chemical-bromatological analysis and aerobic stability. The
experiments were conducted at the premises of Universidade Federal do Oeste do Pará, campus
Santarém-PA. Chapter 1 - is a literature review with description of sorghum, silage reallocation,
urea as an additive and aerobic exposure. Chapter 2 - "Effects of aerobic exposure of relocated
forage sorghum (Sorghum bicolor (L.) Moench) silages". The entirely randomized design was
used with 30 experimental bins, with 10 treatments (silage not reallocated, 0, 6, 12, 18, 24, 30,
36, 48 and 60 hours) and 3 repetitions. After sensory evaluation of the nutritional and health
aspects of the silages, they were classified as "Good to Very Good". The relocation of sorghum
silages promoted a significant effect (P<0.05) on the contents of mineral matter, organic matter,
acid detergent fiber, neutral detergent fiber, ethereal extract, total digestible nutrients, and dry
matter digestibility. The aerobic exposure times, did not promote greater silage stability over
60 hours. Chapter 3 - "Effect of the use of urea levels in sorghum silages submitted to aerobic
exposure, on the chemical-bromatological composition and aerobic stability". The
experimental design used was entirely randomized, in a 5 x 2 factorial scheme, composed of
five levels of urea (0; 0.5; 1 .5; 2.5 and 3.5% based on dry matter) and two aerobic exposure
times 0 and 72 hours. There were four repetitions per treatment, totaling 20 experimental bins.
For data regarding gas losses, dry matter losses, and dry matter recovery, only the 0 hour time
was used. After 100 days of storage the silos were opened, weighed, and had silage samples
collected for analysis at 0 and 72 hours. There was an increasing effect (P<0.05) for crude
protein at 0 h, with increased levels, reaching 7.5%. The addition of urea promoted effect
(P<0.05) for dry matter, mineral matter in relation to the time of 72 hours of anaerobic exposure.
There was a significant effect on the variables of ether extract, insoluble nitrogen compounds
and insoluble protein, the addition of urea promoted changes in the times 0 and 72 hours. The
addition of urea and aerobic exposure of up to 72 hours of the silages promoted changes in
fermentation and aerobic stability remained stable until 84 hours.
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