[Effect of energy level of rations and time of blood sampling on the relative activity lf LDH isoenzymes in the serum of lambs].

The effect of the energy level of the feed ration and the time of blood sampling on the Lactate Dehydrogenase (LDH)-Isoenzyme pattern in the blood serum of "Thessaloniki" crossbred type lambs was examined. For this purpose 24 lambs, 45 days old, were randomly allocated in three groups (8 animals each group). The lambs were (after weaning) fed by rations differing in energy content. (Gruppe A: 12.0 MJ, M.E./kg, Gruppe B: 10.8 MJ, M.E./kg, Gruppe C: 9.9 MJ, M.E./kg). For the estimation of the main effects and interactions a least square analysis was applied. The effect of the energy level upon the relative distribution of LDH-Isoenzymes in the serum of lambs was significant only for the enzymes LDH1 and LDH5, between the groups A and C. As to the effect of time of blood sampling there were significant differences in all isoenzymes. The interaction "ration X" "time of blood sampling" was only significant for LDH1-isoenzymes.