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. 2019 Sep 1;9(9):640. doi: 10.3390/ani9090640

Figure 1.

Figure 1

Average raw spectra of extruded dry dog food using near-infrared spectroscopy for the complete dataset (n = 119), and groups according to the main protein source: Red meat group (n = 37), fish group (n = 13), mixed group (n = 15), chicken group (n = 29), and white meat group (n = 21).