Table 2.

Fatty acid composition of experimental diets (% as-fed)¹

	High		Low0		Low1.25		Low2.5		Low5		Common
Item	Phase I	Phase II	Phase I	Phase II	Phase I	Phase II	Phase I	Phase II	Phase I	Phase II	Phase III
C14:0	0.02	0.01	0.03	0.01	0.12	0.10	0.17	0.18	0.27	0.37	0.01
C16:0	0.94	0.96	0.97	0.97	0.99	1.00	1.03	1.03	0.99	1.15	0.98
C16:1	0.02	0.01	0.04	0.01	0.16	0.13	0.24	0.25	0.36	0.50	0.01
C18:0	0.15	0.15	0.15	0.16	0.16	0.17	0.17	0.17	0.17	0.20	0.16
C18:1	1.77	1.84	1.72	1.78	1.43	1.51	1.32	1.29	0.83	0.86	1.86
C18:2n6	3.79	3.93	3.78	4.00	3.03	3.27	2.70	2.64	1.47	1.42	4.15
C18:3n3	0.12	0.12	0.15	0.16	0.15	0.16	0.16	0.17	0.15	0.18	0.17
C18:4n3	0.00	0.00	0.01	0.00	0.04	0.04	0.06	0.07	0.10	0.14	0.00
C20:5n3, EPA2	0.01	0.00	0.04	0.01	0.19	0.16	0.28	0.29	0.44	0.61	0.00
C22:5n3	0.00	0.00	0.01	0.00	0.03	0.03	0.05	0.05	0.07	0.11	0.00
C22:6n3, DHA3	0.01	0.01	0.04	0.01	0.18	0.16	0.28	0.28	0.42	0.60	0.00
Omega-3	0.15	0.13	0.25	0.18	0.61	0.56	0.86	0.89	1.23	1.72	0.17
EPA + DHA	0.03	0.01	0.09	0.02	0.37	0.32	0.56	0.57	0.86	1.21	0.00
Omega-6	3.80	3.93	3.79	4.00	3.07	3.31	2.76	2.70	1.57	1.55	4.15
Omega- 6:omega-3	26.1	30.9	15.0	22.7	5.00	5.85	3.20	3.02	1.27	0.90	24.7

¹Dietary treatments: [1] positive control (High; contained multiple sources of proteins, including animal proteins and 5% corn oil), [2] negative control (Low0; contained soybean meal as the main protein source and 5% corn oil), or 1 of 3 Low diets supplemented with increasing levels of fish oil to replace corn oil: [3] 1.25% fish oil (Low1.25), [4] 2.5% fish oil (Low2.5), [5] 5% fish oil (Low5) fed in 2 phases (7 and 14 d, respectively). All pigs received common phase III diets thereafter for 3 wk.

²Eicosapentaenoic acid.

³Docosahexaenoic acid.