Table 2. Fatty acid compositions (%) in the milk of Jersey and Holstein cows at 3 DIM and 30 DIM.

Fatty acid	Jersey		Holstein		SEM	p-value
	3 DIM	30 DIM	3 DIM	30 DIM		DIM	Breed	DIM × Breed
% of total fatty acid
C14:0 (Myristic acid)	10.15 ± 0.45x	8.81 ± 0.36y	12.13 ± 1.40x	8.53 ± 0.60y	0.30	0.005	0.347	0.151
C16:0 (Palmitic acid)	36.15 ± 0.79x	32.02 ± 0.84y	40.82 ± 4.05x	31.25 ± 0.96y	0.67	< 0.001	0.286	0.087
C16:l n-7 (Palmitoleic acid)	2.71 ± 0.08	2.47 ± 0.11	3.04 ± 0.03	2.77 ± 0.10	0.06	0.059	0.060	0.940
C18:0 (Stearic acid)	13.53 ± 0.50y	17.88 ± 0.84x	10.76 ± 1.49y	16.67 ± 1.44x	0.54	< 0.001	0.116	0.515
C18:l n-9 (Oleic acid)	32.73 ± 0.85y	35.16 ± 0.85x	29.42 ± 4.00y	37.33 ± 0.55x	0.62	0.007	0.855	0.096
C18:2 n-6 (Linoleic acid)	3.20 ± 0.35	2.56 ± 0.08	2.64 ± 0.12	2.33 ± 0.08	0.18	0.087	0.446	0.738
C18:3 n-6 (γ-Linoleic acid)	0.13 ± 0.01	0.12 ± 0.01	0.12 ± 0.01	0.13 ± 0.00	0.01	0.761	0.973	0.515
C18:3 n-3 (Linolenic acid)	0.43 ± 0.05	0.33 ± 0.02	0.29 ± 0.03	0.29 ± 0.04	0.03	0.200	0.121	0.497
C20:l n-9 (Eicosenoic acid)	0.46 ± 0.04	0.42 ± 0.01	0.34 ± 0.03	0.37 ± 0.01	0.02	0.463	0.180	0.561
C20:4 n-6 (Arachidonic acid)	0.52 ± 0.05x	0.23 ± 0.04y	0.46 ± 0.04x	0.33 ± 0.09y	0.03	< 0.001	0.710	0.337
Saturated fatty acids	59.83 ± 0.95x	58.71 ± 0.96y	63.70 ± 3.96x	56.45 ± 0.49y	0.65	0.023	0.651	0.090
Monounsaturated fatty acids	35.90 ± 0.90y	38.05 ± 0.93x	32.79 ± 4.00y	40.47 ± 0.56x	0.64	0.019	0.970	0.113
Polyunsaturated fatty acids	4.27 ± 0.41x	3.24 ± 0.13y	3.51 ± 0.05x	3.08 ± 0.19y	0.21	0.026	0.839	0.600
C18:0: C18:l	2.47 ± 0.09x	2.06 ± 0.14y	2.74 ± 0.01x	2.29 ± 0.16y	0.07	0.007	0.372	0.049

Values are expressed as mean ± SEM of 6 dairy cows in each group.

^x,yDenote comparisons made between 3 DIM and 30 DIM in each breed group (p < 0.05).

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