Table 1. Ingredient and chemical composition of different total mixed rations fed on Hanwoo heifer during the growing period

Items	TMR diets1)
	CON	L-IRGS	H-IRGS
Ingredients (% DM)
Oat hay	21.09	6.91	-
Timothy hay	9.26	7.28	-
Alfalfa hay	13.95	7.31	-
Corn silage	-	4.77	9.11
Italian ryegrass silage	-	19.07	36.43
Corn gluten feed	12.83	12.57	12.54
Lupin seed	10.94	10.74	10.70
Wheat bran	12.45	12.22	12.17
Corn	17.33	17.01	16.95
Vitamin-mineral supplement2)	0.68	0.67	0.67
Limestone	1.23	1.21	1.20
Salt	0.24	0.24	0.23
Chemical composition (%)
Crude protein (CP)	16.23	16.36	16.01
Ether extract (EE)	3.74	3.61	3.39
Ash	4.83	5.55	5.11
Neutral detergent fiber (NDF)	41.82	42.27	42.33
Acid detergent fiber (ADF)	23.21	23.05	23.31
Calcium	0.78	1.02	1.25
Phosphorus	0.53	0.67	0.79
Nonstructural carbohydrate (NSC)3)	35.22	31.26	31.67
Total digestible nutrients (TDN)	72.24	72.84	72.74

TMR diet: CON, total mixed ration containing oat hay, timothy, and alfalfa hay; L-IRGS, total mixed ration containing 19% of Italian ryegrass silage; H-IRGS, total mixed ration containing 36% of Italian ryegrass silage.
Vitamin-mineral supplement contained vit. A 2,650,000 IU, vit. D₃ 530,000 IU, vit. E 1,050 IU, niacin 10,000 mg, Mn 4,400 mg, Zn 4,400 mg, Fe 13,200 mg, Cu 2,200 mg, iodine 440 mg, and Co, 440 mg/kg of Grobic-DC provided from Bayer Health Care (Leverkusen, Germany).
NSC was calculated according to the formula: NSC = 100 – (NDF + CP + EE + Ash) [71].
DM, dry matter.