Influence of organic versus inorganic dietary selenium supplementation on the concentration of selenium in colostrum, milk and blood of beef cowsReport as inadecuate




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Acta Veterinaria Scandinavica

, 50:43

First Online: 03 November 2008Received: 02 April 2008Accepted: 03 November 2008

Abstract

BackgroundSelenium Se is important for the postnatal development of the calf. In the first weeks of life, milk is the only source of Se for the calf and insufficient level of Se in the milk may lead to Se deficiency. Maternal Se supplementation is used to prevent this.

We investigated the effect of dietary Se-enriched yeast SY or sodium selenite SS supplements on selected blood parameters and on Se concentrations in the blood, colostrum, and milk of Se-deficient Charolais cows.

MethodsCows in late pregnancy received a mineral premix with Se SS or SY, 50 mg Se per kg premix or without Se control – C. Supplementation was initiated 6 weeks before expected calving. Blood and colostrum samples were taken from the cows that had just calved Colostral period. Additional samples were taken around 2 weeks milk and 5 weeks milk and blood after calving corresponding to Se supplementation for 6 and 12 weeks, respectively Lactation period for Se, biochemical and haematological analyses.

ResultsColostral period. Se concentrations in whole blood and colostrum on day 1 post partum and in colostrum on day 3 post partum were 93.0, 72.9, and 47.5 μg-L in the SY group; 68.0, 56.0 and 18.8 μg-L in the SS group; and 35.1, 27.3 and 10.5 μg-L in the C group, respectively. Differences among all the groups were significant P < 0.01 at each sampling, just as the colostrum Se content decreases were from day 1 to day 3 in each group. The relatively smallest decrease in colostrum Se concentration was found in the SY group P < 0.01.

Lactation period. The mean Se concentrations in milk in weeks 6 and 12 of supplementation were 20.4 and 19.6 μg-L in the SY group, 8.3 and 11.9 μg-L in the SS group, and 6.9 and 6.6 μg-L in the C group, respectively. The values only differed significantly in the SS group P < 0.05. The Se concentrations in the blood were similar to those of cows examined on the day of calving. The levels of glutathione peroxidase GSH-Px activity were 364.70, 283.82 and 187.46 μkat-L in the SY, SS, and C groups, respectively. This was the only significantly variable biochemical and haematological parameter.

ConclusionSe-enriched yeast was much more effective than sodium selenite in increasing the concentration of Se in the blood, colostrum and milk, as well as the GSH-Px activity.

Electronic supplementary materialThe online version of this article doi:10.1186-1751-0147-50-43 contains supplementary material, which is available to authorized users.

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Author: Petr Slavik - Josef Illek - Michal Brix - Jaroslava Hlavicova - Radko Rajmon - Frantisek Jilek

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