Abstract
Intraruminal selenium soluble-glass boluses were administered by balling gun to 65 of 125 crossbred beef cows (Shorthorn X Charolais) during the last trimester of pregnancy. Elevated (P less than .01) whole blood glutathione peroxidase (GSH-Px) concentrations were observed monthly for the next 10 mo following initiation of treatment, reaching the maximum magnitude (263 vs 41) at the fourth month. Monthly milk samples showed elevated selenium concentrations (P less than .01, April through August; P less than .05 through September). Intraruminal, selenium soluble-glass bolus administration to gestating cows was highly effective in raising the selenium status of their progeny. Although the control calves were in low-selenium status, no acute cases of nutritional muscular dystrophy were observed during this experiment.
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