Boluses of controlled release glass for supplementing ruminants with cobalt

摘要: Boluses of controlled release glass containing cobalt and weighing approximately either 60 g or 14.5 were administered to 22 steers 21 sheep respectively. The housed slaughtered at intervals between 17 145 days after dosing. boluses released more than 0.85 mg daily. In both untreated dosed animals serum liver vitamin B12 concentrations the upper end normal range. Two types sheep. five wethers one 0.07 per day, in 16 grazing lambs a second 0.15 day. Fourteen recovered from up 276 concentration increased significantly mean +/- sd 1.64 0.47 2.02 0.04 ng/ml 3.84 4.99 0.72 micrograms/g dry weight liver.