Table 1.

Lipid status and fatty acid methyl ester concentrations in the serum of rats exposed to a shortened daily photoperiod and regular light/dark cycle.

Parameter [mmol/L]	C12/12	DM12/12	C6/18	DM6/18
Total cholesterol	1.04 ± 0.09	1.06 ± 0.06	1.08 ± 0.08	1.11 ± 0.10
TRG	0.65 ± 0.14	0.87 ± 0.17 **	0.66 ± 0.08	0.58 ± 0.12 ##
HDL	0.52 ± 0.05	0.45 ± 0.04	0.46 ± 0.03	0.63 ± 0.09 ** ##
C16:0	23.65 ± 1.55	22.83 ± 3.82	23.96 ± 2.91	23.62 ± 2.28
C18:0	12.36 ± 2.29	12.95 ± 1.41	11.76 ± 1.95	11.18 ± 2.05
C16:1	0.42 ± 0.06	0.42 ± 0.62	0.54 ± 0.09	0.53 ± 0.12
C18:1ω9	9.55 ± 2.74	8.34 ± 0.85	10.78 ± 1.41	12.16 ± 3.97 ##
C18:1ω7	2.04 ± 0.26	1.05 ± 0.27 **	1.81 ± 0.31	1.93 ± 0.62 ##
C18:2	28.97 ± 2.36	28.77 ± 4.07	26.57 ± 3.71	28.32 ± 3.07
C18:3ω6	0.12 ± 0.04	0.25 ± 0.12	0.15 ± 0.03	0.24 ± 0.18
C20:3	0.50 ± 0.08	0.44 ± 0.04	0.62 ± 0.17	0.66 ± 0.16 ##
C20:4	19.66 ± 2.07	19.87 ± 2.15	19.99 ± 2.73	20.68 ± 3.73
C22:4	0.43 ± 0.08	0.42 ± 0.07	0.39 ± 0.05	0.54 ± 0.15
C18:3ω3	0.32 ± 0.14	0.32 ± 0.11	0.28 ± 0.04	0.29 ± 0.08
C20:5	0.06 ± 0.03	0.09 ± 0.02	0.08 ± 0.05	0.07 ± 0.03
C22:5	0.45 ± 0.16	0.37 ± 0.07	0.35 ± 0.05	0.45 ± 0.13
C22:6	1.27 ± 0.31	0.99 ± 0.19	1.18 ± 0.15	1.45 ± 0.38 ##

All values are expressed as means ± SD. The significance of differences was estimated by an analysis of variance (ANOVA) with Dunnett’s post hoc test (** p < 0.01 vs. C_12/12, ## p < 0.01 vs. DM_12/12). Abbreviations: TRG, triglycerides; HDL, high-density lipoproteins; C16:0, palmitic acid; C18:0, stearic acid; C16:1, palmitoleic acid; C18:1ω9, oleic acid; C18:1ω7, vaccenic acid; C18:2, linolelaidic acid; C18:3ω6, γ-linolenic acid; C20:3, dihomo-γ-linolenic acid; C20:4, arachidonic acid; C22:4, docosatetraenoic acid; C18:3ω3, α-linoleic acid; C20:5, eicosapentaenoic acid; C22:5, docosapentaenoic acid; C22:6, docosahexaenoic acid.