Fig. 3.

Tocopherol digestibility in rumen (A), small intestine (B), feed-ileum (C), total tract (D), and hindgut (E). Total α-tocopherol originates from feedstuffs and vitamin supplement. Natural α-tocopherol originates from feedstuffs. Synthetic α-tocopherol originates from vitamin supplements. RRR-α-tocopherol (2R-(4′R, 8′R)-5,7,8-trimethyltocol) originates from feedstuffs and vitamin supplement. Synthetic 2R-α-tocopherol is summation of RRS (2R-(4′R, 8′S)-5,7,8-trimethyltocol), RSR (2R-(4′S, 8′R)-5,7,8-trimethyltocol), and RSS-α-tocopherol (2R-(4′S, 8′S)-5,7,8-trimethyltocol). 2S-α-tocopherol is summation of SRR (2S-(4′R, 8′R)-5,7,8-trimethyltocol), SSR (2S-(4′S, 8′R)-5,7,8-trimethyltocol), SRS (2S-(4′R, 8′S)-5,7,8-trimethyltocol), and SSS-α-tocopherol (2S-(4′S, 8′S)-5,7,8-trimethyltocol). α-Tocotrienol and γ-tocopherol are 2R-(4′R, 8′R)-5,7,8-trimethyltocotrienol and 2R-(4′R, 8′R)-,7,8-dimethyltocol, respectively. P-values show that average across treatments is different from zero. Error bars represent the standard error of means. ¹Data for small intestinal digestibility and feed-ileum digestibility of α-tocotrienol were not normally distributed; therefore, the data were transformed by root square, and back transformed was reported.