Effect of dietary electrolyte balance on production, immune response and mineral concentrations of the femur in broilers.

The aim of this study was to assess the age-related effects of dietary electrolyte balance (DEB) on the performance, immune response (from day 0 to 42) and macromineral content of femur ash of broilers. The DEB values of the purchased commercial broiler diets were modified with the addition of NH4Cl or NaHCO3 to formulate the diets (DEB 325, 250, 175, 100, 25 and -50 mmol/kg) for this investigation. A total of 396 chickens were divided into 6 treatment groups and fed with the experimental diets for 6 weeks. During the first two weeks of life, DEB did not influence feed intake and body weight gain; however, by the 21st day of age DEB 175 and between 22 and 42 days of age DEB 250 mmol/kg gave significantly better results than the control. DEB did not affect the macromineral concentrations of bone ash. The immune response of broilers on low DEB (< 175 mmol/kg) was faster and more intensive than that of chickens on diets with medium or high DEB (> 175 mmol/kg). It can be concluded that the optimal DEB value required for the best body weight gain is significantly influenced by the age of broilers. Our results call attention to the discrepancy between the decreasing DEB level of commercial broiler diets and the age-related increase of 'electrolyte requirements' of broilers. It is also interesting that DEB may influence not only the performance but also the immune response of broilers.

Bioinformatical results based on statistical methods for endectocide products against fly-larvae.

The larvicide effects of three endecticide products were studied against house fly larvae. Repeated-measure design was used for the analysis of variance. The observed data followed different distributions. For this reason, instead of the repeated measure ANOVA, three fast statistical methods were applied simultaneously. First, the test for homogeneity was carried out for registered samples by using the Friedman test, and the Wilcoxon-Wilcox test was applied for pairwise comparisons. Secondly, an extended median test was applied for the same problem of test for homogeneity, and the Neményi test was used for pairwise comparisons. Thirdly, a 2 x 2 contingency table analysis was carried out, exploiting the specific feature of the database and informatical tools. The three simultaneous evaluations enabled us to come to sound, affirmative conclusions. In the course of veterinary-biological interpretation we demonstrated the statistically reliable temporal efficiency of the three products. We also presented the relative efficiency and recognizable features of the products. We highlighted the significantly prompt and long release larvicide effects of the drugs. We discussed and compared the information content of the applied statistical methods.