Blood flow through portal-drained viscera (PBF) was related to metabolizable energy intake (MEI) in six Hereford × Angus heifers (41 observations), three nonlactating Holstein cows (four observations) and four lactating Holstein cows (14 observations). The linear equation (R2 = 0.75, Sy.x = 55) was PBF (L/h) = 352 + 5.8 ± 0.5 (MEI, MJ/day).
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G. B. Huntington (1984) studied this question.