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Effect of Dietary Rare Earth Elements on Growth Performance and Blood Parameters of Rats by M. L. He; Y. Z. Wang; Z. R. Xu; M. L. Chen; W. A. Rambeck is a Agricultural and Biological Sciences article available to read on EtoBox.

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## Summary Rare earth elements (REE) have been shown to influence growth performance in animal production, especially in pigs. In the present study, the effect of oral administration of rare earth elements on growing rats was investigated. Pure LaCl~3~ or an REE mixture containing 38% of LaCl~3~, 52% of CeCl~3~, 3% of PrCl~3~ and 7% of chlorides of other REE were used at two different concentrations as supplements to the diets. Fifty male Wistar rats at 4 weeks of age were allotted to five experimental groups: a control group; a La‐low group and a La‐high group with 75 and 150 mg/kg LaCl~3~·6H~2~O, respectively; a REE‐low and an REE‐high group with 75 and 150 mg/kg REE mixture, respectively. The animals were housed in individual pens. Feed and water were provided __ad libitum__. After 18 days the oral supplementation of LaCl~3~·6H~2~O or of the REE mixture improved daily body weight gain (BWG) by up to 5 or 9% (p > 0.05), respectively. LaCl~3~·6H~2~O as well as the REE mixture had positive effects (p < 0.05) on feed conversion ratio (FCR) with a decreased ratio by up to 8 and 11%, respectively. Supplementation of REE also had clear effects on blood serum parameters. The activities

Who reads Effect of Dietary Rare Earth Elements on Growth Performance and Blood Parameters of Rats?

Author

M. L. He; Y. Z. Wang; Z. R. Xu; M. L. Chen; W. A. Rambeck

Publisher

John Wiley and Sons; Wiley (Blackwell Publishing); Blackwell Publishing Inc.; Wiley-Blackwell Publishing Ltd; Wiley (ISSN 0931-2439)

Published

2003

Language

EN

Field

Agricultural and Biological Sciences (Life Sciences)