Table 5.

Proximate analysis of percentage chemical fat, collagen, moisture, and protein of raw longissimus steaks from beef cows finished over varied DOF¹ and fed RH

	DOF1			Days on RH2			P-values
Item, %	28	42	56	0	28	SEM3	Linear1	Quadratic1	RH	DOF × RH
Fat	3.58	4.02	4.39	4.15	3.84	0.17	0.06	0.92	0.38	0.41
Moisture	71.45	71.16	71.29	71.38	71.22	0.26	0.80	0.70	0.77	0.23
Protein	23.38	23.20	22.64	22.86	23.28	0.25	0.23	0.72	0.39	0.12
Collagen	1.59	1.62	1.68	1.61	1.65	0.08	0.64	0.97	0.78	0.11

¹Cows were finished for a period of 28, 42, and 56 d before slaughter.

²Treatment diets were formulated to contain no RH (0 d) or RH (400 mg per cow per day; Actogain 45; Zoetis, Parsippany, NJ) for the final 28 d before slaughter.

³Pooled standard error of treatment means (days on RH, n = 24 pens per main-effect mean; DOF, n = 16 pens per main-effect mean).