Regional variation in fatty acid content of retail whole milk, g/100 g (12-month average ± SE).

<p><b>A:</b> Linoleic acid (LA, ω-6). <b>B:</b> α-linolenic acid (ALA, ω-3). <b>C:</b> Conjugated linoleic acid. Abbreviations: NW = Northwest, CA = California, RM = Rocky Mountain, TX = Texas, MW = Midwest, NE = Northeast, M-A = mid-Atlantic. Numbers of samples apply to panels B and C; for panel A conventional NE is 34 and All is 107. For LA and ALA, all differences between organic and conventional contents are statistically significant by Mann-Whitney test (<i>P</i><0.005) except for the CA region (<i>P</i>≥0.10). For CLA no such differences are statistically significant (<i>P</i>>0.08) except for the NE region and All regions (<i>P</i><0.001).