Statistical analysis was performed as a completely randomized design with a 2 by 4 factorial arrangement of treatments. Tukey t-test was used for mean separation. For aerobic stability determination, triplicate silos from each treatment were emptied after 45 and 90 d of ensiling, placed into styrofoam containers lined with a plastic bag and exposed to air for 5 d. Temperature was monitored every 6 hours during the 5 d with a thermometer embedded in the surface of the exposed silage. pH was measured after 0, 1, 3 and 5 d. Statistical analysis of pH data was performed as a completely randomized design with a 2 by 5 factorial arrangement of treatments. The same model was utilized for temperature data except that 19 times of aerobic exposure (hours) were utilized instead of 5 d. Tukey t-test was also used for mean comparison. BSM enhanced the fermentation characteristics of corn ensiled during 45 d as evidenced by lower pH (P<0.05) and higher lactic acid content (P<0.05). After 90 d of fermentation BSM lowered the ratio of NH3-N/total-N (P<0.05) as compared with corn ensiled without additive. After the opening of the silos at the d 45 and 90 the temperature of silages treated with BSM was lower than that of the control silage (P<0.05). In summary, BSM improved the fermentation characteristics and the aerobic stability of corn ensiled under tropical laboratory conditions.
کد مقاله : BSA-002
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