Obsah toxickych prvku - Cd, Pb, Hg, Cr, Cu, Zn - v krvi a placente krav v dobe porodu a u narozenych telat.
1990
Simonik I. | Pavelka J. | Kudlac E.
It was demonstrated that mother's blood and the blood of new-born calves were contaminated by toxic elements in exposed and non-exposed area. The average Cd and Zn levels differed at high statistical significance in the mothers blood from non-exposed regions in comparison with the average Cd and Zn levels from exposed region. The average residues of toxic elements in breeding cows placenta from the exposed and non-exposed regions were not statistically different. The average Zn content in new-born calves from non-exposed regions differed highly statistically significantly in comparison with the average Zn content in the blood of new-born calves from heifers of the exposed region. The transplacental ratio (TPx) of a toxic element in cow placenta during parturition was expressed from the average ratio of toxic element content in mother's blood: toxic element content in placenta: the toxic element content in blood of newborn calf, while the content of toxic element in mother's blood during parturition was expressed by a value equal to one. TPx in parturition period was expressed by mathematical formula TPX = 1 : xp : xk, where xp = toxic element content in placenta, xk = content of the toxic element in blood of new-born calf. TPPb, Hg, Cr, Cu, Zn values were not statistically different between the groups of breeding cows from exposed and non-exposed regions. TPCd in the group comprising 14 first-calves from the exposed region (TPCd = 1 : 0,89 : 2,59 in comparison with TPCd of six cows from non-exposed region, where TPCd = 1 : 0,29 : 0,70;, differed statistically highly significantly. High statistical differences in TPCd between these groups were explicitly affected highly statistically significantly by different average Cd content in the blood of fourteen first-calvers, compared with the average Cd content in blood of six cows from non-exposed region, in which the Cd value in blood during parturition was higher by 0.1.
显示更多 [+] 显示较少 [-]