Table 4.

Effect of Bacillus subtilis PB6 and/or chromium propionate supplementation on growth performance of beef cattle during the feedlot finishing period

	Treatmenta					P-value
Item	CON	CST	CHR	CST + CHR	SEMb	CST	CHR	CST × CHR
BW, kg
Day 84	342	349	342	344	3.08	0.19	0.38	0.45
Day 112	394	404	396	397	3.56	0.11	0.47	0.24
Day 140	453	461	454	450	3.80	0.55	0.22	0.17
Day 168	502	509	502	498	4.26	0.73	0.19	0.21
Day 196	545	550	542	537	4.66	0.91	0.08	0.29
Day 224	586	593	583	578	5.17	0.92	0.09	0.28
Finalc	636	644	627	624	5.61	0.62	0.02	0.34
ADG, kg
Days 56−84	1.95	1.83	1.83	1.81	0.05	0.16	0.14	0.46
Days 84−112	2.05	2.12	2.10	2.14	0.05	0.24	0.56	0.76
Days 112−140	1.87	1.81	1.87	1.67	0.06	0.05	0.25	0.27
Days 140−168	1.76	1.73	1.72	1.69	0.05	0.60	0.52	0.95
Days 168−196	1.52	1.47	1.42	1.39	0.05	0.50	0.07	0.76
Days 196−224	1.50	1.51	1.47	1.47	0.06	0.82	0.57	0.91
Day 224 to final	1.32	1.36	1.19	1.28	0.05	0.24	0.07	0.70
Day 56 to final	1.72	1.71	1.66	1.63	0.02	0.50	0.01	0.73
Initiald to final	1.61	1.63	1.57	1.56	0.02	0.73	0.03	0.40

^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.

^dInitial = average of day −1 and day 0 BW.