TABLE 21-3, Predicted Protein and Amino Acid Requirements for First-Lactation and Mature Holstein and Jersey Cows at Varying Days in Milk - Nutrient Requirements of Dairy Cattle

Parity (Body Weight, kg)	Holstein	Jersey
Days in milk	15	150	20	100	200	15	150	20	100	200
Milk, kg/d	33	39	53	55	43	22	27	35	37	31
Milk protein, %	3.06	3.02	2.76	2.83	3.26	3.90	3.70	3.49	3.46	3.69
Milk protein, g/d	1,010	1,178	1,463	1,557	1,402	858	999	1,222	1,280	1,144
Dry matter intake, kg/d	20.8	23.9	25.8	29.4	27.4	16.5	19.4	20.5	23.5	21.9
Protein intake, g/d	3,370	4,063	4,515	5,116	4,795	2,772	3,414	3,690	4,230	3,854
Rumen degradable, g/d	2,080	2,390	2,580	2,940	2,740	1,650	1,940	2,050	2,350	2,190
Rumen undegradable, g/d	1,290	1,673	1,935	2,176	2,055	1,122	1,474	1,640	1,880	1,664
Net protein, g/d	1,462	1,667	2,005	2,141	1,968	1,207	1,382	1,644	1,749	1,586
Metabolizable protein, g/d (eff. = 0.69)	2,034	2,333	2,802	2,999	2,757	1,686	1,942	2,306	2,457	2,228
Target Absorbed Essential Amino Acids	Target Efficiency	Target Absorbed Amino Acids, g/d
Histidine	0.75	53	61	73	79	72	39	54	50	67	61
Isoleucine	0.69	108	126	152	164	149	88	113	117	142	127
Leucine	0.74	182	211	254	273	249	137	183	179	229	206
Lysine	0.70	154	179	216	232	212	120	162	156	202	183
Methionine	0.70	49	57	69	74	68	39	52	52	66	59
Phenylalanine	0.60	113	131	157	169	154	87	114	115	143	129
Threonine	0.60	104	120	143	155	142	80	107	103	133	121
Tryptophan	0.63	25	29	35	38	34	19	26	25	32	29
Valine	0.85	120	139	168	181	165	96	127	127	159	143

Parity (Body Weight, kg)

Holstein

Jersey

First (570 kg)

Mature (700 kg)

First (425 kg)

Mature (525 kg)

Days in milk

150

100

200

150

100

200

Milk, kg/d

Milk protein, %

3.06

3.02

2.76

2.83

3.26

3.90

3.70

3.49

3.46

3.69

Milk protein, g/d

1,010

1,178

1,463

1,557

1,402

858

999

1,222

1,280

1,144

Dry matter intake, kg/d

20.8

23.9

25.8

29.4

27.4

16.5

19.4

20.5

23.5

21.9

Protein intake, g/d

3,370

4,063

4,515

5,116

4,795

2,772

3,414

3,690

4,230

3,854

Rumen degradable, g/d

2,080

2,390

2,580

2,940

2,740

1,650

1,940

2,050

2,350

2,190

Rumen undegradable, g/d

1,290

1,673

1,935

2,176

2,055

1,122

1,474

1,640

1,880

1,664

Net protein, g/d

1,462

1,667

2,005

2,141

1,968

1,207

1,382

1,644

1,749

1,586

Metabolizable protein, g/d (eff. = 0.69)

2,034

2,333

2,802

2,999

2,757

1,686

1,942

2,306

2,457

2,228

Target Absorbed Essential Amino Acids

Target Efficiency

Target Absorbed Amino Acids, g/d

Histidine

0.75

Isoleucine

0.69

108

126

152

164

149

113

117

142

127

Leucine

0.74

182

211

254

273

249

137

183

179

229

206

Lysine

0.70

154

179

216

232

212

120

162

156

202

183

Methionine

0.70

Phenylalanine

0.60

113

131

157

169

154

114

115

143

129

Threonine

0.60

104

120

143

155

142

107

103

133

121

Tryptophan

0.63

Valine

0.85

120

139

168

181

165

127

159

143

From: 21, Nutrient Requirement Tables

Cover of Nutrient Requirements of Dairy Cattle

Nutrient Requirements of Dairy Cattle: Eighth Revised Edition.

National Academies of Sciences, Engineering, and Medicine; Division on Earth and Life Studies; Board on Agriculture and Natural Resources; Committee on Nutrient Requirements of Dairy Cattle.

Washington (DC): National Academies Press (US); 2021 Aug 30.

NCBI Bookshelf. A service of the National Library of Medicine, National Institutes of Health.

TABLE 21-3Predicted Protein and Amino Acid Requirements for First-Lactation and Mature Holstein and Jersey Cows at Varying Days in Milk