Selenium dynamics in the blood of beef cows and calves fed diets supplemented with organic and inorganic selenium sources and the effect on reproduction
2008
Slavik, P.,Ceska Zemedelska Univ., Prague (Czech Republic). Katedra Veterinarnich Disciplin | Illek, J.,Veterinarni a Farmaceuticka Univ., Brno (Czech Republic). Klinika Chorob Prezvykavcu | Rajmon, R.,Ceska Zemedelska Univ., Prague (Czech Republic). Katedra Veterinarnich Disciplin | Zeleny, T.,Veterinarni Centrum, Susice (Czech Republic) | Jilek, F.,Ceska Zemedelska Univ., Prague (Czech Republic). Katedra Veterinarnich Disciplin
In three beef herds young heifers (H), cows in late pregnancy (CLP) and their calves (C) were randomly grouped by 6 in order to compare the effects of feed supplementation with sodium selenite or selenized yeast on Se levels in blood serum and reproduction indicators. The mean Se serum levels were as follows: Herd 1: 51.01 microg/L in H, 32.12 microg/L in CLP, and 29.07 microg/L in C; Herd 2: 27.42 microg/L (H), 22.9 microg/L (CLP), and 23.46 microg/L (C); Herd 3: 27.07 microg/L (H), 22 microg/L (CLP), and 31.05 microg/L (C). Over a 6-month period, the animals in Herd 1 were given selenium yeast supplement, in Herd 2 sodium selenite, whereas Herd 3 served as a negative control. Then a second blood sample was taken. The mean Se serum levels were as follows: Herd 1: 90.73 microg/L in CLP (p less than 0.01), 57.99 microg/L in C (p less than 0.01); Herd 2: 42.08 microg/L (CLP, p less than 0.01), 37 microg/L (C, p less than 0.05); Herd 3: 25.77 microg/L (CLP), 32.85 microg/L (C). A significant difference was also observed in the second blood sample in both CLP and C between the Herds 1 and 2 (p less than 0.01). Herds 1 and 2 showed an improvement in their health status that was independent of the Se form supplied. Nevertheless, the organic form led to a quicker and more reliable increase in Se blood level.
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