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Discoloration and amino acid degradation of feed upon 98 days of storage in stressed conditions: (A) images of feed throughout the stability study; changes in (B) a* and b* values and (C) L* values of the RT and 37 °C stored samples (no light exposure); (D) changes in amino acid content of feed upon 37 °C storage (no light exposure). Gray zones indicate the maximum variability due to the analytic method.
