. 2020 Dec 12;99(1):skaa394. doi: 10.1093/jas/skaa394

Table 2.

Initial BW and DMI for all steers (n = 25) used in the experiment as well as DMI and visits to the GEM system for steers that met the criteria for measuring gaseous emissions. Steers fed a corn-based finishing diet without (control) or supplemented with low, medium, and high doses of 3-NOP

	Treatment¹						P-value²
Item	Control	Low	Medium	High	SEM	3-NOP	Period	Int
All animals (n = 25)³
Starting BW, kg	420	421	421	421	3.25	0.99	…	…
Total DMI, kg/d	11.46	10.77	11.48	10.73	0.29	<0.001	0.43	<0.001
Period 1	11.69^a	10.48^b	10.99^ab	10.39^b
Period 2	11.07	11.20	11.23	10.58
Period 3	11.21^ab	10.56^b	11.61^a	10.31^b
Basal dietary DMI (GrowSafe bunks)	10.97	10.24	10.86	10.12	0.21	<0.001	0.24	<0.001
Period 1	11.38^a	10.07^a	10.63^ab	10.22^b
Period 2	10.72	10.66	10.82	10.27
Period 3	10.82^ab	9.98^bc	11.12^a	9.85^c
Pellet DMI (GEM system)	0.49^b	0.53^ab	0.63^a	0.61^ab	0.06	0.045	<0.001	0.08
Animals visiting the GEM system⁴
No. of animals⁵	9–14	12–18	12–17	10–15	…	…	…	…
Total DMI, kg/d	11.22	10.49	11.57	10.77	0.37	0.003	0.50	0.04
Basal diet DMI (GrowSafe bunks)	10.66^a	9.86^b	10.89^a	10.14^b	0.36	0.004	0.58	0.06
Pellet DMI (GEM system)	0.57	0.64	0.67	0.61^a	0.05	0.16	0.04	0.48
Visits to the GEM system/animal
No. of 4-h blocks in which visits occurred	5.76	5.84	5.91	5.86	0.09	0.43	0.33	0.80
Weekly visits per animal	22.40	27.31	28.10	29.29	2.96	0.12	0.09	0.48
Visit duration (min:s)	4:51^b	4:53^b	5:10^a	5:06^ab	0.24	0.01	<0.001	0.21

¹The measured 3-NOP concentration was 0, 85.6, 107.6, and 124.5 mg/kg dietary DM consumed for the control, low, medium, and high treatment, respectively.

²Int, interaction between 3-NOP and period.

³For the high-dose treatment, one animal died on day 56, and another animal was removed on day 106 due to health issues unrelated to treatment.

⁴Visits were compiled into six 4-h blocks corresponding to the time of day. Only animals with ≥10 “good” weekly visits in at least five of the six 4-h time blocks were selected for final analysis within period.

⁵The number of animals in periods 1, 2, and 3 was 9, 10, and 14 for control; 12, 16, and 18 for low; 12, 15, and 17 for medium; 10, 12, and 15 for high treatments, respectively.

^a–cValues within a row with different letters differ at P ≤ 0.05.