Table 3. Amino acid compositions (%) in the milk of Jersey and Holstein cows at 3 DIM and 30 DIM.

Item	Jersey		Holstein		SEM	p-value
	3 DIM	30 DIM	3 DIM	30 DIM		DIM	Breed	DIM × Breed
% of the milk sample
Cysteine	0.097	0.045	0.153	0.043	0.008	< 0.001	0.186	0.167
Methionine	0.137	0.081	0.142	0.071	0.009	0.001	0.933	0.743
Asparagine	0.578	0.291	0.766	0.277	0.040	< 0.001	0.391	0.322
Threonine	0.401	0.185	0.578	0.180	0.031	< 0.001	0.234	0.241
Serine	0.514	0.237	0.693	0.227	0.038	< 0.001	0.386	0.334
Glutamine	1.326	0.738	1.584	0.692	0.081	< 0.001	0.609	0.467
Glycine	0.190	0.081	0.259	0.078	0.015	< 0.001	0.404	0.365
Alanine	0.273	0.134	0.359	0.122	0.020	< 0.001	0.459	0.338
Valine	0.433	0.215	0.557	0.193	0.031	< 0.001	0.523	0.370
Isoleucine	0.304	0.162	0.348	0.144	0.019	< 0.001	0.790	0.523
Leucine	0.716	0.373	0.892	0.344	0.047	< 0.001	0.537	0.395
Tyrosine	0.370	0.157	0.463	0.147	0.028	< 0.001	0.543	0.460
Phenylalanine	0.348	0.187	0.417	0.175	0.022	< 0.001	0.605	0.464
Lysine	0.562	0.295	0.718	0.276	0.037	< 0.001	0.476	0.363
Histidine	0.178	0.093	0.231	0.090	0.012	< 0.001	0.426	0.379
Arginine	0.274	0.123	0.379	0.123	0.022	< 0.001	0.367	0.333
Proline	0.660	0.370	0.865	0.370	0.045	0.001	0.443	0.335

DIM, days in milk; SEM, standard error of means.