Meta-analysis of the effect of oral selenium supplementation on milk selenium concentration in cattle

A. Ceballos; J. Sánchez; H.W. Barkema; H. Stryhn; J.B. Montgomery; J.J. Wichtel

Meta-analysis of the effect of oral selenium supplementation on milk selenium concentration in cattle

in Mastitis control

Autor:innen:

A. Ceballos

A. Ceballos ¹Dept. of Health Management, Atlantic Veterinary College, University of Prince Edward Island. Charlottetown, PE C1A 4P3, Canada

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J. Sánchez

J. Sánchez ²Canadian Food and Inspection Agency. Charlottetown, PE C1E 1E3, Canada

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H.W. Barkema

H.W. Barkema ³Dept. of Production Animal Health, Faculty of Veterinary Medicine, University of Calgary. Calgary, AB, T2N 4N1, Canada Corresponding author: aceballos@upei.ca

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H. Stryhn

H. Stryhn ¹Dept. of Health Management, Atlantic Veterinary College, University of Prince Edward Island. Charlottetown, PE C1A 4P3, Canada

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J.B. Montgomery

J.B. Montgomery ¹Dept. of Health Management, Atlantic Veterinary College, University of Prince Edward Island. Charlottetown, PE C1A 4P3, Canada

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, und

J.J. Wichtel

J.J. Wichtel ¹Dept. of Health Management, Atlantic Veterinary College, University of Prince Edward Island. Charlottetown, PE C1A 4P3, Canada

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Art:: Kapitel

Seiten:: 125–134

DOI:: https://doi.org/10.3920/9789086866496_022

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Soils in many regions of the world have low selenium (Se) content. Consequently, forages and crops grown on these soils may provide inadequate dietary Se for grazing animals and humans. Results of recent surveys in different countries reported a significant proportion of cattle appear to receive inadequate dietary Se, and that deficiency has been associated with several economically important diseases, such as mastitis. Selenium supplementation has been used to enhance Se status but results are still controversial. Milk Se concentration is an indicator of animal/herd Se status, and reflects the responsiveness to supplementation. A systematic review and meta-analysis were performed on 42 studies published between 1977 and 2007 to summarise all available scientific evidence of the effect of oral Se supplementation on milk Se concentration in cattle. The literature search was based on electronic and non-electronic databases. Fixed- and random-effects models of meta-analysis were performed, and a metaregression was carried out to evaluate the heterogeneity among studies. The overall effect of oral Se supplementation was an increase of milk Se concentration in 0.16 (95% CI: 0.117, 0.207) μmol/l (P<0.05). Separate analyses for two sources of Se indicated that Se yeast had a larger effect as compared to sodium selenite/selenate. On average, cows supplemented with Se-yeast had a milk Se concentration of 0.33 (95% CI: 0.190, 0.476) μmol/l higher than in cows supplemented with sodium selenite/selenate. Dose of Se had a quadratic association to milk Se concentration, and dose explained 74% of the between study variance. Begg’s (P<0.01) test and visual analysis suggested a weak evidence of publication bias. This information provides a basis for tailoring daily requirements of Se for lactating cattle.

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Mastitis control

From science to practice

ISBN:: 9789086866496

Verleger:: Wageningen Academic

Print-Publikationsdatum:: 30 Oct 2008

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Meta-analysis of the effect of oral selenium supplementation on milk selenium concentration in cattle

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Mastitis control

From science to practice

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