Energy Profile in Broiler Chickens Fed with Different Levels of Humates

The objective of the study was the evaluation the effects of the peroral intake of humates (HS) added into feed mixtures on the energy metabolism of broiler chickens (Cobb 500). The selected parameters are concentrations of glucose, triglycerides and cholesterol analysed in the blood serum. There were used four groups of birds (A, B, C, negative control; n=120) in the experiment. Chickens were fed with ground diets (starter HYD1, grower HYD2, finisher HYD3) with supplements of HS from day 1 to 37 as follows A: Humac nature (HN) 7 g/kg, B: Humac nature monogastric (HNM) 7 g/kg, C: HNM 5 g/kg feed (Humac Ltd., Slovak Republic). The diets had the following content of crude protein: HYD1 230.20, HYD2 222.20, HYD3 209.40 g CP /kg dry matter). The statistical evaluation of results was performed by one-way analysis of variance and means were compared by the Student-Newman-Keuls test and correlation analysis. Higher concentrations (P<0.05) of triglycerides in blood serum were analyzed in groups A or B by 0.24 and 0.26 mmol/l, respectively, in comparison to the control group (y = 0.35830x + 0.58324). The values of cholesterol were at a lower level (P<0.05) in all 3 experimental groups by 1.07, 0.54 and 0.84 mmol/l (y = - 1.18073x + 2.75772). The positive effect of the intake of HS on glucose concentration was not confirmed when a higher concentration (P<0.05) was analyzed in the blood serum of the control group compared with groups A or C by 3.31 and 4.56 mmol/l (y = - 4.06420x + 13.37519), respectively.