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Concentration of (a) β-hydroxybutyrate (β-OHB) and (b) non-esterified fatty acids (NEFA) in plasma (both mmol/L) in mature ewes (dashed line) and maiden sheep (dotted lines) throughout the study period. The time × age-group interaction was significant (p < 0.0001). Data are mean ± S.E.M. Asterisks indicate significant differences between age groups at each time point (**** p < 0.0001; *** p < 0.001).
