Abstract
Article Details: Received: 2020-10-21 | Accepted: 2020-11-27 | Available online: 2021-01-31 https://doi.org/10.15414/afz.2021.24.mi-prap.150-154 The effect of the administration of two humic preparations on a selected production and biochemical parameters were monitored in an experiment with broiler chickens of the Cobb 500 breed. There were not observed statistically significant differences between the control group and the experimental groups in the achieved average live weight and the feed conversion ratio in the 37-day experiment. The statistically significant differences (PË0.001 and PË0.05) were between the content of calcium, phosphorus and chlorides in the blood of the control group compared to the experimental groups. As for magnesium in the blood, we did not find significant differences (Pâ¥0.05) between the groups. As far as the parameters of the energy profile are concerned, the content of glucose and cholesterol was statistically significantly higher in the control group in comparison with the experimental groups (PË0.05). The concentrations of triglycerides were statistically significantly higher in the experimental groups (Pâ¤0.05, resp. 0.01, resp. 0.001) compared to the control group. Keywords: nutrition, humic substances, production, blood, broilers References  ARPAÅ OVÃ, H. et al. (2016). Use of humic acid in nutrition of broiler chickens. Slovenský chov , 32-33. In Slovak. AVCI, M. et al. (2007). Effects of humic acid at different levels on growth performance, carcass yields and some biochemical parameters of quails. Journal of Animal and Veterinary Advances , 6(1), 1-4. BAHODARI, Z. et al. (2017). The effect of earthworm meal with vermi-humus on growth performance, haematology, immunity, intestinal microbiota, carcass characteristics, and meal quality of broiler chickens. Livestock Science , 202, 74-81. https://doi.org/10.1016/j.livsci.2017.05.010 EL-ZAIAT, H. M. et al. (2018). Impact of humic acid as an organic additive on ruminal fermentation constituents, blood parameters and milk production in goats and their kids growth rate. Journal of Animal and Feed Science , 27(2), 105-113. https://doi.org/10.22358/jafs/92074/2018 HAKAN, K. et al. (2012). Effects of boric acid and humate supplementation on performance and egg quality parameters of laying hens. Brazilian Journal of Poultry Science , 14(4), 233-304. https://doi.org/10.1590/S1516-635X2012000400008  JAÄUTTOVÃ, I. et al. (2019). The effect of dietary humic substances on the fattening performance, carcass weight, blood biochemistry parameters and bone mineral profile of broiler chickens. Acta Veterinaria Brno , 88, 307-313. https://doi.org/10.2754/avb201988030307 MAJEWSKA, M. et al. (2017). Influence of humic acid supplemented to sheep diets on rumen enzymatic activity. Medycyna Weterynaryjna , 73(12), 770-773. https://doi.org/ 10.21521/mw.5822 MUDROÅOVÃ, D. et al. (2020) The effect of humic substances on gut microbiota and immune response of broilers. Food and Agricultural Immunology , 31(1), 137-149. https://doi.org/10.1080/09540105.2019.1707780 NAGARAJU, R. et al. (2014). Effect of dietary supplementation oh humic acids on performance of broilers. Indian Journal of Animal Science , 84(4), 447-452. https://doi.org/ PMC6811714 PISTOVÃ, V. et al. (2017). The effect of the humic substances, garlic ( Allium sativum L.), wormwood ( Artemisia absinthium ) and walnut ( Juglans regia ) on carcass parameters of broiler chickens. Scientific Papers Animal Science and Biotechnologies , 50(1), 234-237. RZASA, A. et al. (2014). Humic-fatty acid preparation in growing rabbits nutrition. Journal of Polish Agricultural Universities , 17(3), 1-6. TERRY, S. A. et al. (2018). Effect of humic substances on rumen fermentation, nutrient digestibility, methane emissions, and rumen microbiota in beef heifers. Journal of Animal Science , 96(9), 3863-3877. https://doi.org/10.1093/jas/sky265 . TICHA, A. et al. (2009). Humic substances influence on cholesterol absorption. Klinicka biochemie a metabolizmus , 17(1), 37-41. In Czech. VAÅ KO, L. et al. (2012). Humic acids in nutrition and effect on metabolism and health production. Slovenský chov , 5, 40-41. In Slovak. WANG, Q., et al. (2008). Effects of supplemental humic substances on growth performance, blood characteristics and meat quality in finishing pigs. Livestock Science , 117(2-3), 270-274. https://doi.org/ 10.1016/j.livsci.2007.12.024 YORUK, M. A. et al. (2004). The effects of supplementation of humate and probiotic on egg production and quality parameters during the late laying period in hens. Poultry Science , 83(1), 84-88. https://doi.org/ 10.1093/ps/83.1.84
Highlights
Humic substances are a class of compounds resulting from the decomposition of organic matter
2.1 Animals and diets The trial was performed with 90 one-day-old Cobb 500 breed broiler chickens up to 37 days of age, which was the age of slaughter
3 Results and discussion The effects of the addition of two preparations of humic substances on the production parameter and selected biochemical markers in the blood of experimental animals were studied in the experiment with the broiler chickens
Summary
Humic substances are a class of compounds resulting from the decomposition of organic matter. Many studies have showed their capacity to inhibit bacterial growth, improve the immune system, antiviral properties, as well as to prevent and care intestinal disorders, improve the nutritive value of feed and trace element utilisation, with positive effects on growth performance and a reduction in mortality (Nagaraju et al, 2014; Mudroňová et al, 2020). The use of humic substances in animal nutrition has been a topic of many trials with ruminants (Majewska et al, 2017; El-Zaiat et al, 2018; Terry et al, 2018), pigs (Wang et al, 2008) rabbits (Rzasa et al, 2014) and poultry (Yoruk et al, 2004; Avci et al, 2007; Pistová et al, 2017). The aim of this work was to evaluate the effect of two humic preparations added to feed in the same concentration (0.7%) on production efficiency and selected blood parameters in broiler chickens of the Cobb 500 breed
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