Author/Editor		Zadnik, T; Jazbec, I
Title		Lead concentration in blood of dairy cows as an indicator of environmental contamination
Translated title		Vsebnost svinca v krvi molznic kot indikator kontaminacije okolja
Type		članek
Source		Zb Vet Fak Univ Ljublj
Vol. and No.		Letnik 33, št. 2
Publication year		1996
Volume		str. 233-40
Language		eng
Abstract		It has stated that further reductions of lead emissions in the Meža Valley, Slovenia are needed based on a critical evaluation of lead and its compounds entering the environment durign mining, smelting, processing, use and disposal. The absorbed lead via the food chain and inhalation from the atmosphere is not decomposed in the organism. A systematic monitoring of lead levels in blood has proved as a reliable bioindicator of environmental lead pollution. In 1993, a new source of lead emissions in the Meža Valley was detected. For the melioration of marschy areas and road works gravel from the mine and a secondary smelter was used. Lead poisining was diagnosed on a farm where the above mentioned gravel and dross was used for works around the pastures. Since 1979, mean lead blood values of dairy cows have shown a decreasing trend which indicates lower lead concentrations within the mining area. Despite favorable results, hazards of lead poisoning may continue to exist for cattle in the Meža Valley due to considerable lead accumation in the organism of animals from the immediate environment.
Summary		Sistematično merjenje vsebnosti svinca v krvi mlečnih krav je dober bioindikator onesnaženja okolja s to prvino. Leta 1994 je bila povprečna vrednost (x = 0,095 +- 0,013 ppm) v krvi krav z dveh mlečnih farm v Mežiški dolini v mejah normale. Rezultat sicer ni popolnoma zanesljiv, saj krave y 11 farm, ki so bile prav tako zajete v sistematične preiskave, niso bile vključene v naše rezultate. Leta 1993 je bil odkrit nov vir emisije svinca v okolje. Žlindra in drugi odpadki iz plavža, ki so vsebovali velike količine svinčevih snovi, so se namreč uporabili pri melioraciji zamočvirjenih pašnikov in travnikov. Glede na naše rezultate je dokaj visoka vsebnost svinca v krvi mlečnih krav posledica krmljenja s senom, travo in silažo, onesnaženo s svincem. Iz razpoložljivih rezultatov lahko sklepamo, da se bo zastrupljanje goveda s svincem v Mežiški dolini v prihodnosti še nadaljevalo. Zato priporočamo, da se sistematično merjenje svinca in drugih biokemičnih parametrov nadaljuje pri večjem številu živali.
Descriptors		LEAD ENVIRONMENTAL POLLUTANTS CATTLE SLOVENIA LEAD POISONING