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The study concerned the determination of the influence of various manufactured mineral-plant additives, based on humic and calcium raw materials and dried herbs, lucerne and glycerol, on the content of Ca, P, Mg, K, Na, Cl and Cu, Fe, Zn in the blood serum of Lohmann Brown (LB) laying hens housed in a deep litter system. Five groups (20 hens in each) were formed, and they were fed using a standard...
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