Table 2. Amino acid (AA) profiles (% of crude protein) of concentrate, corn silage, alfalfa hay and timothy hay used in the experiment

Item	Concentrate	Corn silage	Alfalfa hay	Timothy hay
Essential AA
Arginine	5.83	3.32	3.42	3.70
Histidine	3.16	1.74	2.84	2.69
Isoleucine	3.23	3.06	3.34	3.02
Leucine	8.85	8.24	6.69	6.16
Lysine	5.01	2.60	5.69	6.18
Methionine	0.88	2.54	1.23	1.41
Phenylalanine	5.05	4.09	4.57	4.59
Threonine	3.67	3.48	4.37	3.98
Valine	3.82	4.16	4.33	4.15
Non-essential AA
Alanine	5.18	10.72	5.02	5.43
Aspartic acid	9.13	4.77	12.53	10.31
Cysteine	0.80	2.97	1.31	1.59
Glycine	3.90	4.29	4.43	4.26
Glutamic acid	19.76	9.37	9.70	9.48
Proline	6.36	6.09	9.37	10.02
Serine	5.01	2.85	4.90	4.31
Tyrosine	3.57	1.58	2.73	2.51