Two hundred and forty (240) numbers of day old broiler straight run chicks were wing banded, weighed and randomly allotted to 5 groups 6 replicates of eight chicks each based on the body weight. The treatments were, Basal diet without CoQ10 supplementation, Low energy diet without CoQ10 supplementation, Low energy diet with 20mg of CoQ10 /kg diet, Low energy diet with 40mg of CoQ10/kg diet, Low energy diet with 60mg of Co Q /kg diet. The minimum and maximum temperature inside the poultry house were recorded daily by using dry and wet bulb thermometer. The data were used to assess the impact of temperature on performance broiler chicken fed CoQ10. At the end of the experiment (42nd day), ten birds per treatment group were randomly selected and slaughtered by halal method. Liver HMG CO A Reductase enzyme activity was estimated as per the method of Liang et al., 2015. The result of the mean liver HMG Co A reductase (µmol/min/mg protein) were 6.96, 5.26, 5.39 and 5.36 for T2, T3, T4 and T5 respectively, compared to the control 6.94.

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