In vitro ruminal degradability and fermentation kinetics of corn (Zea mays) agro-industrial residues as an alternative feed for ruminants
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The objective of this study was to evaluate the in vitro ruminal degradability and degradation kinetics of agro-industrial maize (Zea mays L.) residues as an alternative for ruminant feeding. A completely randomized design was used with four treatments: corn husk leaves (T1), corn stover (T2), cob without grain (T3), and corn silk (T4), each with five replicates. Dry matter degradability was determined using the in vitro technique with the DAISY II system, considering incubation times of 0, 3, 6, 12, 24, 48, and 72 hours. The results showed significant differences (P < 0.05) among treatments at all evaluated times. Corn silk (T4) exhibited the highest degradability, reaching 68.96% at 72 hours, followed by T1 (49.00%), T2 (42.82%), and T3 (27.78%), indicating greater availability of fermentable substrates and higher ruminal microbial activity. In contrast, no significant differences (P > 0.05) were observed in the evaluated kinetic parameters, including the soluble fraction, potentially degradable fraction, degradation rate, and effective degradability, suggesting a similar fermentative behavior among the residues. In conclusion, there is variability in the degradability of these by-products, with corn silk standing out as an alternative with high nutritional potential.
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