ORIGINAL PAPER
A note on the effect of rare earth elements on the
performance and thyroid hormone status of rearing
piglets
| 1 | Institute of Animal Nutrition, Friedrich-Loeffler-Institute (FLI),
Ferderal Research Institute for Animal Health,
Bundesallee 50, D-38116 Braunschweig, Germany |
| 2 | Institute for Food Toxicology and Chemical Analytics, University of Veterinary Medicine,
Bischofsholer Damm 15, D-30173 Hannover, Germany |
| 3 | Ludwig-Maximilians-University, Faculty of Veterinary Medicine,
Veterinärstr. 13, D-80539 Munich, Germany |
CORRESPONDING AUTHOR
G. Flachowsky
Institute of Animal Nutrition, Friedrich-Loeffler-Institute (FLI), Ferderal Research Institute for Animal Health, Bundesallee 50, D-38116 Braunschweig, Germany
Institute of Animal Nutrition, Friedrich-Loeffler-Institute (FLI), Ferderal Research Institute for Animal Health, Bundesallee 50, D-38116 Braunschweig, Germany
Publication date: 2008-01-15
J. Anim. Feed Sci. 2008;17(1):70–74
KEYWORDS
ABSTRACT
Rare earth elements (REE) have been used for decades in China to promote growth in plant
production and farm animals. Studies are presently also being conducted under Western animal
production conditions, however dose-response studies are relatively rare. In this study a total of 80
piglets were fed a diet supplemented with 0, 100, 200, 400 or 800 mg of citrate-bound rare earth
elements, consisting of, %: lanthanum 30, cerium 55, praseodymium 5 and neodymium 10. The trial
lasted 35 days, the initial mean body weight of the piglets was 7.2 kg. Apart from growth and feeding
parameters, blood serum was analysed for T3 and T4 by radioimmunoassay (RIA). Feed intake decreased
insignifi cantly with higher REE-levels. The daily weight gain of piglets amounted to 283 (control), 301
(100 mg), 254 (200 mg), 258 (400 mg) and 271 g (800 mg). Thyroid hormone levels increased with
REE-supplementation. More dose-response studies will be necessary to prove the effects of REE on
growth parameters and their intermediate effects.
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