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A polymer-vitamin B12 implant system has been developed to overcome the disadvantages of traditional vitamin B12 administration to sheep. The ethylene/vinyl acetate (EVAc) copolymer was pre-blended with crystalline vitamin B12. The blends were then extruded at 100 °C at a constant pressure and rate using a piston extruder to form a polymer-vitamin B12 composite cord. The final implant was a cylinder...
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