Table 4.

Effects of ABVista yeast (S. cerevisiae) in natural-program beef steers fed steam-flaked corn-based diets on carcass measurements

Item	Treatment			SEMa	P-values*
	CTL	LY	HY		Linear	Quadratic	Contrast
HCW, kg	376	379	376	5.3	0.99	0.67	0.83
Dressing percentb	62.9	62.8	63.3	0.31	0.33	0.46	0.63
12th rib fat, mm	19.8	18.2	19.1	0.91	0.59	0.27	0.47
LM area, cm2	87.8	89.0	88.4	1.45	0.79	0.59	0.83
Marbling scorec	59.1	57.9	60.7	2.01	0.59	0.45	0.93
KPH, %	2.0	2.0	2.0	0.02	0.80	0.89	0.77
Calculated yield grade	3.7	3.4	3.6	0.13	0.56	0.30	0.31
Quality Graded
Prime, %	27.7	11.2	18.9	7.71	0.37	0.15	0.11
Premium Choice, %	33.3	68.8	70.5	8.12	< 0.01	0.12	< 0.01
Choice, %	33.8	11.3	8.7	11.63	0.05	0.45	0.03
Liver scoree
Total nonabscessedf, %	97.6	97.7	95.5	3.27	0.52	0.70	0.74
Total noncondemnedg,%	81.6	86.7	81.6	6.37	0.99	0.47	0.71

^aStandard error of the mean, n = 12 pens per treatment.

^bDressing percent was calculated using nonshrunk final BW/HCW.

^c30 = sight; 40 = small; 50 = modest; 60 = moderate; 70 = slightly abundant.

^dQuality grade, as determined by USDA personnel.

^eBecause of the limited number of abscesses, the general linear mixed model did not converge; thus, nonabscessed and noncondemned proportions were used.

^fExcludes A+, A, and A− abscessed livers.

^gExcludes A+, A, A− abscessed livers, and livers with flukes.

*P-values for the linear, quadratic, and contrast (control vs. the average of the yeast treatments) effects of yeast dose (CTL = 0; LY = 1.33; and HY = 2.66 g of live yeast per steer daily).