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Relationship between the pre- and post-feed skim milk leptin levels and feed volume, where feed volumes are divided into the first quartile (0–41 g; n = 67), the second quartile (42–65 g; n = 57), the third quartile (66–105 g; n = 62) and the fourth quartile 105 g; n = 56). Regression and equivalence lines are shown in solid black and dashed lines, respectively.
