Table 7.

Effect of bismuth subsalicylate and calcium ammonium nitrate on nutrient intake, apparent total tract digestibility, and sulfur absorption

Item	Treatment1					SEM2	P-value3
	U	NIT	UBS	NITBS	LOW-S		SUL	NPNS	BSS	BSS × NPNS
Intake4, kg/d
DM	8.47	8.05	8.19	8.28	8.24	0.362	0.674	0.661	0.962	0.499
OM	8.02	7.63	7.73	7.83	7.81	0.342	0.687	0.694	0.907	0.499
CP	1.23	1.20	1.21	1.24	1.18	0.064	0.512	0.988	0.839	0.546
NDF	1.70	1.68	1.61	1.60	1.61	0.082	0.499	0.867	0.346	0.967
ADF	0.62	0.62	0.61	0.59	0.61	0.031	0.717	0.664	0.549	0.769
S	0.031	0.029	0.030	0.030	0.021	0.0013	< 0.001	0.516	0.996	0.472
Digestibility, %
DM	66.0	67.7	72.4	68.9	64.5	2.53	0.590	0.657	0.056	0.176
OM	68.1	69.4	74.1	71.0	66.7	2.42	0.593	0.611	0.045	0.225
CP	53.7	55.9	64.0	55.7	51.7	3.46	0.593	0.253	0.065	0.055
NDF	26.3	32.8	31.7	27.7	21.2	6.01	0.436	0.770	0.975	0.227
ADF	18.7	26.3	27.9	19.3	15.9	6.43	0.692	0.914	0.812	0.083
S absorption, %	60.8	63.6	55.1	48.9	44.6	2.75	< 0.001	0.4705	< 0.001	0.056

¹U, Control (Urea at 0.68% with 0.28% RAS); NIT, Nitrate (eCAN at 2.0% with 0.28% RAS); UBS, Urea-Bismuth (Urea at 0.68% and BSS at 0.33% with 0.28% RAS); NITBS, Nitrate-Bismuth (eCAN at 2.0% and BSS at 0.33% with 0.28% RAS); LOW-S, Low sulfur (Urea at 0.68% with 0.14% RAS).

²n = 10 experimental units/treatment mean.

³Significance is declared at P< 0.05, tendencies are discussed at 0.05 < P < 0.10. SUL, Effect of sulfur; NPNS, Effect of non-protein nitrogen source; BSS, Effect of BSS; BSS × NPNS, Interaction between NPNS and BSS.

⁴Nutrient intake was measured (on the per steer basis) over a 7-d period.