Simoník I, Pavelka J, Kudlác E
Okresní veterinární správa, Karviná.
Vet Med (Praha). 1990 Aug;35(8):457-66.
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 (P less than 0.01) 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 differ 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 (P less than .01). High statistical differences (P, less than 01) TPCd between these groups were explicitly affected highly statistically significantly (P less than .01) by different average Cd content in the blood of fourteen first-calves, 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 10(-1).
结果表明，在暴露区域和非暴露区域，母牛血液和新生犊牛血液均被有毒元素污染。与暴露区域的镉（Cd）和锌（Zn）平均水平相比，非暴露区域母牛血液中的平均Cd和Zn水平在统计学上有极显著差异（P小于0.01）。暴露区域和非暴露区域繁殖母牛胎盘中毒性元素的平均残留量无统计学差异。与暴露区域小母牛所产新生犊牛血液中的平均Zn含量相比，非暴露区域新生犊牛的平均Zn含量在统计学上有极显著差异。分娩时母牛胎盘中毒性元素的经胎盘比率（TPx）由母体血液中有毒元素含量：胎盘有毒元素含量：新生犊牛血液中有毒元素含量的平均比率表示，而分娩时母体血液中有毒元素的含量用等于1的值表示。分娩期的TPx用数学公式TPx = 1 : Xp : Xk表示，其中Xp = 胎盘有毒元素含量，Xk = 新生犊牛血液中有毒元素含量。暴露区域和非暴露区域繁殖母牛组之间的TPPb、Hg、Cr、Cu、Zn值无统计学差异。暴露区域14头初产母牛组的TPCd（TPCd = 1:0.89:2.59）与非暴露区域6头母牛的TPCd（TPCd = 1:0.29: 0.70）相比，有极显著统计学差异（P小于0.01）。与非暴露区域6头母牛血液中的平均Cd含量相比，这两组之间TPCd的高度统计学差异（P小于0.01）明显受到14头初产母牛血液中不同平均Cd含量的极显著影响（P小于0.01），其中分娩时血液中的Cd值高10(-1) 。
