Table 6.

Management system effect on ribeye area, fat depth, and percent i.m. fat of yearling feedlot control steers (FLT), yearling steers grazing perennial pasture (PST), or yearling steers grazing annual forage (ANN)

	Treatments1
Item	PST	ANN	SEM2	Trt3 (P value)4
Ultrasound measurement5
LM area, cm2
Start	48.80	49.00	0.436	0.46
End	55.90	70.10	1.621	0.03
Change	7.10	21.10	1.828	0.03
Percent change, %	14.50	43.10	4.007	0.04
Back fat, cm:
Start	0.42	0.41	0.0185	0.65
End	0.59	0.84	0.163	0.34
Change	0.17	0.44	0.176	0.31
Percent change, %	40.50	107.30	45.543	0.33
Intramuscular fat, %:
Start	3.37	3.43	0.125	0.32
End	3.22	4.13	0.200	0.13
Change	−0.16	0.70	0.298	0.001
Percent change, %	−5.90	19.90	10.295	0.001

¹PST = crested wheatgrass and native range; ANN = crested wheatgrass, native range, field pea–barley, and unharvested corn.

²SEM of the least squares mean (n = 3 replications/yr).

³Trt = treatment.

⁴Means with P ≤ 0.05 differ significantly.

⁵Aloka SSD-500V Portable Ultrasound Machine; Aloka UST-5044-3.5 Linear Array Transducer and Standoff, Sentinel Imaging Group, Inc., 1-888-838-7488.