Table 5.

Effect of Bacillus subtilis PB6 and/or chromium propionate supplementation on DMI and feed efficiency of beef cattle during the feedlot finishing period

	Treatmenta					P-value
Item	CON	CST	CHR	CST + CHR	SEMb	CST	CHR	CST × CHR
DMI, kg/d
Days 56−84	6.62	6.79	6.56	6.69	0.13	0.28	0.52	0.89
Days 84−112	8.44	8.76	8.56	8.50	0.14	0.35	0.61	0.14
Days 112−140	9.21	9.48	9.48	9.07	0.15	0.68	0.64	0.03
Days 140−168	9.62	9.57	9.60	9.37	0.15	0.34	0.47	0.54
Days 168−196	9.25	9.20	9.04	8.80	0.19	0.45	0.12	0.62
Days 196−224	9.24	9.32	9.14	9.02	0.17	0.91	0.27	0.56
Day 224 to finalc	9.17	9.29	8.94	8.78	0.15	0.91	0.02	0.35
Day 56 to final	8.71	8.85	8.68	8.53	0.12	0.97	0.15	0.25
Day 0 to final	8.01	8.20	8.00	7.94	0.11	0.53	0.25	0.25
G:F, kg
Days 56−84	0.3067	0.2787	0.2858	0.2759	0.0076	0.02	0.13	0.24
Days 84−112	0.2462	0.2411	0.2453	0.2516	0.0062	0.93	0.45	0.36
Days 112−140	0.2070	0.1946	0.1994	0.1883	0.0052	0.03	0.19	0.90
Days 140−168	0.1829	0.1814	0.1790	0.1799	0.0047	0.96	0.57	0.80
Days 168−196	0.1649	0.1598	0.1563	0.1587	0.0046	0.78	0.30	0.42
Days 196−224	0.1601	0.1616	0.1590	0.1628	0.0060	0.65	0.99	0.85
Day 224 to final	0.1451	0.1478	0.1343	0.1465	0.0053	0.17	0.26	0.37
Day 56 to final	0.1978	0.1936	0.1913	0.1921	0.0023	0.46	0.09	0.29
Day 0 to final	0.2013	0.1996	0.1967	0.1971	0.0022	0.77	0.12	0.65

^aCON = placebo control; CST = 13 g per animal daily DM inclusion of Bacillus subtilis PB6 (CLOSTAT, Kemin Industries, Des Moines, IA); CHR = 450 ppb DM chromium propionate (KemTRACE Chromium, Kemin Industries); CST + CHR = 13 g per animal daily DM inclusion of Bacillus subtilis PB6 + 450 ppb DM chromium propionate.

^bStandard error of least square mean.

^cFinal = average BW of day prior to and day of harvest.