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. 2017 Nov;95(11):4998–5011. doi: 10.2527/jas2017.1595

Table 5.

Effect of the feeding system during lactation and the inclusion of quebracho in the fattening concentrate on the instrumental color, heme pigments, and lipid oxidation in the longissimus thoracis et lumborum muscle

Lactation1 Concentrate2 P-value
Item Indoor Alfalfa Sainfoin Control QUE Lactation Concentrate
Lightness (L*) 42.0a ± 0.37 40.4b ± 0.40 40.9b ± 0.38 41.0 ± 0.31 41.2 ± 0.31 0.010 0.625
Redness (a*)3 11.4b ± 0.18 12.1ab ± 0.21 12.3a ± 0.21 12.1 ± 0.17 11.7 ± 0.17 0.005 0.087
Yellowness (b*) 7.0a ± 0.18 6.2b ± 0.19 6.4b ± 0.19 6.5 ± 0.15 6.6 ± 0.15 0.016 0.595
Hue angle 31.5a ± 0.92 27.2b ± 0.96 27.2b ± 0.94 28.0 ± 0.77 29.3 ± 0.76 0.002 0.234
Chroma3 13.5 ± 0.16 13.7 ± 0.17 14.0 ± 0.17 13.9 ± 0.14 13.6 ± 0.14 0.177 0.149
Metmyoglobin3 1.14a ± 0.010 1.06b ± 0.010 1.08ab ± 0.010 1.09 ± 0.008 1.08 ± 0.008 0.001 0.486
Oxymyoglobin3,4 0.43a ± 0.005 0.42ab ± 0.005 0.41b ± 0.005 0.41 ± 0.004 0.42 ± 0.004 0.013 0.036
Lipid oxidation3 1.4a ± 0.09 1.2b ± 0.09 0.8c ± 0.09 1.2 ± 0.08 1.0 ± 0.07 0.001 0.100
a–c

Means within a row with different superscripts significantly differ among feeding system during lactation (P < 0.05).

1

Indoor = ewes fed a total mixed ration; Alfalfa = grazing on alfalfa; Sainfoin = grazing on sainfoin.

2

Control = commercial concentrate; QUE = commercial concentrate with 5% quebracho.

3

Affected by the interaction between the feeding system during lactation and the display time (P < 0.05; see Fig. 1, 2, and 3).

4

Affected by the interaction between the inclusion of quebracho in the fattening concentrate and the display time (P < 0.05; see Fig. 2).