Effect of oral cadmium and zinc application on leukocytes biological activity in Japanese quails (Coturnix coturnix japonica).

Objective of this study was to investigate changes in biological activity of blood leukocytes in Japanese quails, caused by zinc and cadmium administration. Four groups of Japanese quails were used. Three experimental groups of quails were exposed either to Cd (0.12 mg Cd/quail), Zn (4 mg Zn/quail) or a combination of Cd and Zn (0.12 mg Cd, 4 mg Zn/quail), which were added daily to the drinking water. The fourth group was the control group. The metabolic activity of phagocytes and mitogenic activation of lymphocytes to phytohemaglutinine (PHA) were determined on day 37, 58 and 118 of exposure. The numbers of peripheral blood leukocytes of Japanese quail after cadmium and zinc addition in all groups of birds were without significant differences, however, the functional activities of phagocytes and lymphocytes in the Cd-group of quails were significantly decreased. The metabolic activity of phagocytes decreased significantly at all time points analysed (P < 0.05-0.001) in comparison to the control group and the Cd-Zn group. Similarly, the response of lymphocytes to PHA activation in the Cd exposed group of quails decreased significantly on day 58 and 118 of exposure when compared to the control group (P < 0.05) and Zn-group of quails (P < 0.01). Zn in combination with Cd eliminated the immunotoxic effect of Cd on metabolic activity of phagocytes and improved lymphocyte answer to PHA, when compared to the Cd-group on day 58 and 118 of metal administration. The results of the present study indicate that cadmium caused a significant decrease of metabolic activity of phagocytes and mitogenic activation of lymphocytes in peripheral blood of Japanese quails. Simultaneous administration of Zn and Cd eliminated the immunotoxic effect of Cd on functional activity of phagocytes and lymphocytes, and zinc improved both investigated functional parameters of immune cells.

The effect of the probiotic strain Enterococcus faecium DSM 7134 in combination with natural humic substances on performance and health of broiler chickens.

The present study investigated the effect of the probiotic strain Enterococcus faecium DSM 7134 (2 x 10(7) cfu per g of feed) (probiotic group), natural humic substances (7g x kg(-1) feed) (HS group), and the combination of both (probiotic + HS group) on the performance, serum biochemistry, and biological activity of leucocytes of broiler chickens. Average body weight of chickens in different phases as well as throughout the observation period under different treatments did not differ significantly. Final body weight and feed conversion ratio (FCR) reached in 41 days of trial were 2542.5; 2568.9; 2610.5, 2516.6 g and 1.93; 1.81; 1.78; 1.88 kg for HS, probiotic, probiotic + HS and control group respectively. The best performance variables including the European efficiency index (EEI) were observed in the probiotic + HS group, where the effect of the probiotic supplementation was improved by HS. There were no significant differences among groups in the serum levels of total protein, glucose, cholesterol, aminotransferase and phosphorus. A significant decrease of total lipids in the probiotic group (P < 0.01) and probiotic + HS group (P < 0.001) groups, triglycerides levels in the HS (P < 0.01), probiotic and probiotic + HS (P < 0.001) groups on day 35, calcium level of the probiotic (P < 0.05) and probiotic + HS (P < 0.01) groups on day 41 and alkaline phosphatase levels in the probiotic group (P < 0.01) on day 14 were observed in comparison to the control group. Significantly higher values of indices of metabolic activity of phagocytes (IMA) after 14, 35 and 41 days of the experiment were observed in the probiotic + HS group (P < 0.01, P < 0.05) when compared with the control group. No adverse health effects were observed in experimental groups The results of the present study indicate that HS and E. faecium DSM 7134 had no significant effect on performance. However an improvement in FCR and EEI was observed which is believed to be due to the significant increase of indices of metabolic activity of phagocytes, caused by HS when combined with. E. faecium DSM 7134.