Table 3.

Body weight and ultrasound measurements of cows fed high and low intakes with two levels of monensin inclusion

	Lowa		High		Probabilityb
Item	0	200	0	200	SEM	Monensin	Intake
Number of observations	9	10	10	10
Initial measurements
Body weight, kg	430.6	419.4	422.4	433.3	9.79	0.99	0.77
Hip fat, mm	2.46	2.79	2.09	1.83	0.427	0.93	0.11
Back fat, mm	2.57	2.34	1.75	1.68	0.357	0.66	0.04
Ribeye area, cm2	58.19	56.13	56.27	58.97	2.286	0.89	0.84
Final measurements
Body weight, kg	426.2	413.3	445.0	451.1	10.48	0.74	<0.01
Hip fat, mm	2.24	2.69	2.91	2.74	0.489	0.76	0.45
Back fat, mm	2.67	2.26	2.23	2.39	0.461	0.78	0.73
Ribeye area, cm2	63.10	56.63	63.71	62.06	2.388	0.08	0.18
Change in measurements
Body weight, kg	−3.9	−5.4	20.1	15.9	3.21	0.36	<0.01
Hip fat, mm	−0.23	−0.10	0.82	0.91	0.406	0.77	0.01
Back fat, mm	0.10	−0.08	0.48	0.71	0.350	0.94	0.09
Ribeye area, cm2	4.90	0.29	6.94	3.10	1.950	0.03	0.19

^aLow = received 80% NRC requirements; high = received 120% NRC requirements; 0 = 0 mg/d monensin inclusion; 200 = 200 mg/d monensin inclusion.

^bMonensin = effect of 0 vs. 200; intake = effect of low vs. high; no treatment interactions (P > 0.24).