Table 5.

Effect of feeding ractopamine to steers for 42 d on cumulative gas emissions per head

	Treatment1
	CON	RAC	SEM	P-value
NH3, g/steer
Day 0 to 14	869.36	673.04	50.50	0.066
Day 14 to 28	1,708.35	1,460.93	58.65	0.046
Day 0 to 28	2,577.70	2,133.98	89.42	0.032
Day 28 to 42	2,262.11	2,170.24	85.82	0.440
Day 0 to 42	4,839.82	4,304.22	164.32	0.070
CH4, g/steer
Day 0 to 14	4,476.68	4,277.25	290.65	0.645
Day 14 to 28	5,023.71	4,930.17	363.40	0.862
Day 0 to 28	9,500.39	9,207.42	644.38	0.759
Day 28 to 42	5,007.24	5,154.68	368.09	0.787
Day 0 to 42	14,507.63	14,362.10	983.24	0.920
CO2, kg/steer
Day 0 to 14	235.14	230.63	11.93	0.798
Day 14 to 28	292.96	287.04	16.01	0.803
Day 0 to 28	528.10	517.67	27.83	0.800
Day 28 to 42	299.72	300.33	18.56	0.981
Day 0 to 42	827.82	818.00	45.69	0.884
H2S, g/steer
Day 0 to 14	0.78	0.55	0.07	0.009
Day 14 to 28	2.81	2.64	0.22	0.440
Day 0 to 28	3.59	3.19	0.25	0.086
Day 28 to 42	5.74	5.57	0.48	0.803
Day 0 to 42	9.33	8.76	0.70	0.517

¹Treatments: CON = finishing ration containing no RAC (Control); RAC = finishing ration containing 27.3 g/907 kg RAC DM basis (Ractopamine).