Table 3.

Comparison of titanium (Ti) concentrations of spiked fecal samples from dairy cows consuming a lactation ration, beef steers consuming a finishing ration, and cows grazing native range and containing high (1.049 g/kg), medium (0.450 g/kg), or low (0.150 g/kg) concentrations of Ti as measured using an external calibration curve or the internal calibration of an energy dispersive X-ray fluorescence analyzer. The percent difference of the resulting concentration as extrapolated from an external calibration curve or internal calibration to determine which calibration method was more accurate

	Ti concentration, g/kg				Percent difference
	External calibration curve	Internal calibration	SEM1	P-value	External calibration curve	Internal calibration
High, 1.049 g/kg
Feedlot	0.974	1.205	0.0035	<0.001	5.01	9.02
Range	1.133	1.025	0.1471	0.47	5.07	1.55
Dairy	1.051	1.021	0.0010	<0.001	0.13	1.81
Medium, 0.450 g/kg
Feedlot	0.447	0.529	0.0016	<0.001	0.45	10.48
Range	0.493	0.390	0.0024	<0.001	5.99	9.76
Dairy	0.403	0.369	0.0003	<0.001	7.48	13.64
Low, 0.150 g/kg
Feedlot	0.167	0.173	0.0007	<0.001	7.02	9.27
Range	0.147	0.126	0.0013	<0.001	1.35	11.94
Dairy	0.171	0.134	0.0098	<0.001	8.54	7.66

¹Standard error of the mean (n = 60).