Table 5.

Least squares means and 95% confidence intervals of blood plasma fatty acids between low (high feed efficient, HE) and high (low feed efficient, LE) and supplemented with rumen-protected choline (RPC) or not (CTL) in mid-lactation dairy cows.

	HE 1				LE 1				p-Value 2
Fatty Acid, mg/dL 3	CTL		RPC		CTL		RPC		RFI	TRT	RxT
C14:0	0.42	[0.38, 0.47]	0.46	[0.42, 0.51]	0.46	[0.42, 0.50]	0.43	[0.38, 0.47]	0.95	0.81	0.08
C15:0	0.31	[0.28, 0.33]	0.31	[0.28, 0.33]	0.32	[0.29, 0.34]	0.32	[0.29, 0.34]	0.31	0.94	0.94
C16:0	4.10	[3.63, 4.56]	4.01	[3.55, 4.47]	4.00	[3.53, 4.46]	4.20	[3.74, 4.67]	0.84	0.79	0.52
C16:1	0.69	[0.61, 1.03]	0.64	[0.63, 0.69]	0.67	[0.63, 0.73]	0.67	[0.62, 0.74]	0.85	0.91	0.17
C17:0	0.87	[0.78, 0.98]	0.73	[0.66, 0.80]	0.80	[0.72, 0.89]	0.87	[0.78, 0.99]	0.29	0.36	0.02
C18:0	4.72	[4.16, 5.45]	4.52	[4.01, 5.19]	4.64	[4.10, 5.35]	4.93	[4.32, 5.73]	0.59	0.91	0.43
C18:1	3.15	[2.84, 3.47]	3.32	[3.00, 3.63]	3.35	[3.03, 3.66]	3.14	[2.83, 3.46]	0.94	0.90	0.24
C18:2	13.87	[11.8, 15.9]	12.18	[10.1, 14.2]	13.63	[11.5, 15.7]	14.71	[12.7, 16.8]	0.24	0.75	0.16
C18:3	2.21	[1.88, 2.53]	2.10	[1.78, 2.43]	2.30	[1.98, 2.63]	2.35	[2.03, 2.67]	0.28	0.86	0.63
C20:3	1.39	[1.33, 1.45]	1.36	[1.30, 1.41]	1.40	[1.25, 1.54]	1.44	[1.30, 1.59]	0.38	0.91	0.43
C20:4	0.73	[0.69, 0.76]	0.78	[0.74, 0.82]	0.73	[0.70, 0.77]	0.74	[0.71, 0.78]	0.37	0.09	0.21

¹ HE-CTL, n = 6; HE-RPC, n = 6; LE-CTL, n = 6; LE-RPC, n = 6. ² RFI= Residual feed intake group; TRT = dietary treatment; RxT = interaction between RFI and TRT. ³ C16:1 = myristoleate (cis-9); C18:1 = oleate (cis-9); C18:2 = linoleate (cis-9,12); C18:3 = linolenate (cis- 9,12,15); C20:3 = eicosatrienoate (cis-11,14,17); C20:4 = arachidonic acid (cis-5,8,11,14).