The paper presents the level of lead in the liver, gizzard, breast muscles and humerus of game birds, shot during the hunting season of 2016 - 2017 in Bulgaria. In quail gizzards (n=10) radiographic examination showed ingested pellets. In turtle doves (n=10), lead levels in the liver had higher values of 2,501 ± 1,404 mg/kg, compared to the maximum levels of <2 mg/kg. The content of lead in the humerus of partridges (n=10) showed a very high concentrations of 54,241 ± 36,731 mg/kg compared to the base level of 10<20 mg/kg. The high levels of lead in the tissues of the game birds, induced by lead shot exposure, are a significant risk to predators and scavengers.
The pharmacokinetics of ferrous methionate and ferrous sulphate was investigated in broiler chickens after intravenous injection and crop intubation. The iron compounds were injected intravenously in v. brachialis. After a 20-day “wash-out” period the ferrous methionate and ferrous sulphate were administered again by an elastic silicone tube into the crop. The serum concentrations of the iron were determined using a bioanalyser. Two pharmacokinetic approaches were used - compartmental and non-compartmental analysis. After i.v. injection we found statistically significantly longer and better distribution of the iron contained in the ferrous methionate compared to the ferrous sulphate. The АUC0→∞ was statistically significantly higher in the ferrous methionate. In the alimentary tract of broiler chickens, ferrous methionate was absorbed more rapidly than ferrous sulfate. It was also distributed at a higher volume as compared to the ferrous sulfate