Gutiérrez OC, Rosiles MR, Ducoing WA

Language: English/Spanish
References: 16
Page: 291-301
PDF size: 262.61 Kb.

ABSTRACT

The present study was made to determine in vitro release of selenium from mineral pellets of 1 g of weight, with 5 and 10% of selenium and made with three different agglomerates (plaster, concrete-cement and tile- cement), with or without copper sulfate. They were kept in four buffer solutions with pH 7.0, 6.5, 6.0 and 5.5. The concentration of released Se (mg/pellets/day) was measured by atomic absorption spectroscopy on days 1, 4, 8, 16, 32 and 64. At day 4, the plaster pellets were disintegrated in every buffer solution. There was no release of selenium after day 32 in the concrete-cement pellets, with or without copper sulfate. The average release of Se was greater for the pellets containing both tile-cement, and copper sulfate, than the pellets containing only tile-cement without copper sulfate. This was higher for pellets containing 10% of Se than the ones containing 5% Se. Throughout time, a complex interaction was observed between the Se content, the presence or absence of copper sulfate and pH levels, without showing any predominant pattern. In conclusion, the best agglomerate is the tile- cement because the release of Se is more constant and lasts longer.

REFERENCES

1. Allen JG, Steele P, Nasters HG, Dantouono NF. A study of nutritional myopathy in weaner sheep. Aust Vet J 1986; 68: 8-13.

2. Andrews ED, Hogan RG, Sheppard AD. Selenium in soil, pastures and animal tissues in relation to the growth of young sheep on a marginally selenium defi -cient area. N Z Vet J 1975; 24: 111-116.

3. Blodgett DJ, Beuill RF. Pharmacokinetics of selenium administered parenterally at toxic doses in sheep. Am J Vet Res 1987; 48: 530-534.

4. Donald GE, Langlands JP, Bowles JE, Smith AJ, Burke GL. Selenium supplements for grazing sheep. 3. Devel-opment of an intra-ruminal pellet with an extended life. Anim Feed Sci Technol 1993; 40: 295-308.

5. Langlands JP, Donald GE, Bowles JE, Smith AJ. Sele-nium supplements for grazing sheep. 4. The use of intraruminal pellets containing elevated quantities of selenium. Anim Feed Sci Technol 1994; 46: 109-118.

6. Wilkins JF, Hamilton BA. Low release of selenium from recovered ruminal pellets. Aust Vet J 1980; 56: 87-89.

7. Hunter RA, Peter DW, Hudson DR, Chandler,BS. Studies with the intraruminal pellet. I Some factors infl uencing the effectiveness of the pellet for selenium supplementation of sheep. Aust J Agric Res 1981; 32: 927-933.

8. Hudson DR, Hunter RA, Peter DW. Studies with the intraruminal selenium pellet. II. The effect of grain size of selenium on the functional life of pellets in sheep. Aust J Agric Res 1981; 32: 935-945.

9. Peter DW, Hunter RA, Hudson DR. Optimum Se grain size for selenium pellets. In: J McC Howell, JM Gaw-thorne, CL White, editors. Trace element metabolism in man and animals. Canberra: Aust Acad Sci, 1981.

10. Judson GJ, Brown TH, Kemper BR, Turnbull RK. Trace element and vitamin B12 status of sheep given an oral dose of one, two or four soluble glass pellets containing copper, selenium and cobalt. Aust J Exp Agric 1988; 28: 299-305.

11. Daniels WW. Bioestadística: Bases para el Análisis de las Ciencias de la Salud. México (DF): Limusa, S.A. 1977.

12. Maxwell SE, Delaney HD. Designing experiments and analyzing data. A model comparison perspective. Bel-mont, California: Wadsworth Publishing Company, 1990.

13. Millika GA, Johnson DE. Analysis of messy data. Designed experiment. New York: Chapman & Hall, 1992.

14. Montgomery DC. Design and analysis of experiment. 4th ed. New York: John Wiley and sons, 1997.

15. SAS Institute Inc. JMP: Introductory Guide. Cary, NC, USA: SAS Institute Inc. 1995.

16. Millar KR, Meads WJ, Albyt AT, Scahill BG, Sheppard AD. The retention and effi cacy of soluble-glass pellets for providing selenium, cobalt and copper to sheep. N Z Vet J 1988; 36: 11-14.