Table 7.
Instrument color values (L*, a*, b*, hue angle, and saturation), discoloration ratio, and relative pigment proportions (% oxymyoglobin, deoxymyoglobin, and metmyoglobin) of overwrapped packaged longissimus lumborum steaks during retail display as influenced by dose (0, 30, and 60 g/steer daily) of ByPro1 (tannic acid) in steam-flaked corn–based diets of finishing beef cattle
| ByPro inclusion | |||||
|---|---|---|---|---|---|
| Item | Control | 30 g | 60 g | SEM2 | P-value3 |
| Instrument color | |||||
| L* | 42.4 | 39.8 | 39.7 | 3.50 | 0.33 |
| a* | 27.2 | 26.4 | 26.5 | 2.70 | 0.41 |
| b* | 23.6 | 23.1 | 23.1 | 2.21 | 0.16 |
| Hue angle4 | 41.4 | 41.7 | 41.4 | 0.65 | 0.48 |
| Saturation5 | 36.1 | 35.2 | 34.9 | 3.36 | 0.07 |
| Pigment proportion6 | |||||
| Discoloration ratio | 6.7 | 9.5 | 6.6 | 4.46 | 0.60 |
| Metmyoglobin | 19.5b | 20.5ab | 23.3a | 4.88 | <0.01 |
| Deoxymyoglobin | 17.3 | 16.6 | 16.1 | 2.37 | 0.17 |
a,bLeast squares means in a row with different superscripts differ (P < 0.05).
Silvateam USA, Ontario, CA.
n = 10 (for each display day).
P-value for the effect of treatment.
Hue angle = tan−1 b*/a*.
Saturation index = (a*2 + b*2)1/2.
Relative pigment proportions (%; oxymyoglobin, metmyoglobin, and deoxymyoglobin) were calculated using reflectance values obtained using a portable spectrophotometer (Hunter Miniscan XE Plus, model MSXP-4500C; Hunter Associates Laboratory, Inc., Reston, VA) and formulas outlined by the American Meat Science Association (2012).