Absorption and distribution of selenium in animals consuming canola grown for selenium phytoremediation

被引:50
作者
Bañuelos, GS
Mayland, HF
机构
[1] USDA ARS, Water Management Res Lab, Fresno, CA 93727 USA
[2] USDA ARS, Kimberly, ID 83341 USA
关键词
canola; selenium; phytoremediation; lambs; cows;
D O I
10.1006/eesa.1999.1909
中图分类号
X [环境科学、安全科学];
学科分类号
08 ; 0830 ;
摘要
Canola (Brassica napus) grown as a selected plant species for field phytoremediation of selenium (Se) may be harvested and utilized as Se-enriched forage for marginally Se-deficient lambs and cows. Two field studies were conducted under controlled conditions to evaluate the accumulation of Se into different animal tissues, including blood, excreta, and milk. In Study 1, treatments consisted of feeding lambs freshly cut Se-enriched canola (containing approximate to 4 mg Se kg(-1) DM) or control canola (containing <0.1 mg Se kg(-1) DM), respectively, for 64 days. In Study 2, treatments consisted of feeding cows dried Se-enriched canola (containing approximate to 3.5 mg Se kg(-1) DM) as part of their daily ration for 20 days. In Study 1 at postmortem, Se concentrations,were significantly greater in all tested tissues and in excreta from lambs fed Se-enriched canola, In Study 2, Se values were slightly higher in blood and excreta, but not significantly higher in milk from cows sampled throughout the study. Significant differences in total live animal weight were not observed between treatments in either study. Based on these results, canola plants (not including seeds) used for field phytoremediation of Se may be harvested and safely fed to lambs and cows to help meet normal Se intake requirements.
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页码:322 / 328
页数:7
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