Biological Trace Element Research

, Volume 58, Issue 3, pp 255–261 | Cite as

Bioavailability of rumen bacterial Selenium in mice using tissue uptake technique

  • Alexander B. Serra
  • Salome D. Serra
  • Kousei Shinchi
  • Tsutomu Fujihara
Short Communication


A tissue uptake experiment was conducted to determine the bioavailability of rumen bacterial Selenium (Se) in mice. The donor animal was wether fed a diet containing 0.2 mg Se/kg dietary dry matter (DM). Ruminal fluid was collected 2 h postprandially. Bacterial-rich precipitate was obtained by differential centrifugation of the ruminal fluids. This was later freeze-dried and mixed in the diet to be used in feeding the mice experiment. Thirty growing female mice with a body wt (mean±SD) of 21.4±0.74 g were housed in plastic cages (5 mice/cage) and allotted equally to three dietary treatments. Diet 1 and Diet 2 were formulated based on AIN-76, except that no Se supplementation in the form of selenite was made in the former. In Diet 3, rumen bacterial matter was 20% of the diet, which gave an equivalent of 0.1 mg Se/kg dietary DM. The other two diets, Diet 1 and Diet 2, had an Se content of 0.025 and 0.1 mg/kg dietary DM, respectively. A 7-d feeding commenced after 7 d of acclimatization of the semipurified diet. Results showed that those mice fed an Se- (selenite) supplemented diet (Diet 2) had higher (P<0.05) tissue Se concentrations than those mice fed the other two diets. No statistical differences were observed on various tissue Se concentrations between Diet 1 and Diet 3, although the latter diet had higher values. Kidney and liver had the highest Se concentrations compared to the other tissues. This study concludes that bacterial Se collected from the rumen of wether is not fully available for absorption in the intestine of the mice.

Index Entries

Selenium selenite bacterial selenium selenium bioavailability tissue uptake mice 


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Copyright information

© Humana Press Inc 1997

Authors and Affiliations

  • Alexander B. Serra
    • 1
  • Salome D. Serra
    • 1
  • Kousei Shinchi
    • 1
  • Tsutomu Fujihara
    • 1
  1. 1.Faculty of Life and Environmental ScienceShimane UniversityMatsue-shi, ShimaneJapan

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