title: Reaction cements as materials for the sustained release of trace elements into the digestive tract of cattle and sheep. I. Copper release.
abstract: Acid-base reaction cements were produced by reacting copper oxide with phosphoric acid. When placed in the reticulo-rumen of cattle and sheep these cements released copper into the digestive tract for at least 3 months at a rate sufficient to provide the animals' requirements for copper. Lambs given a pellet of cement at 3 months of age had significantly greater concentrations of copper in their livers than similar untreated animals when slaughtered 3-4 months later. It was shown that salts of cobalt and selenium could be incorporated into the cement to provide additional supplementation with these two elements.
mesh_terms: D000818:Animals; D002417:Cattle / Q000378:metabolism*; D003300:Copper / Q000008:administration & dosage* / Q000378:metabolism; D003692:Delayed-Action Preparations; D004064:Digestive System / Q000378:metabolism*; D005260:Female; D010756:Phosphoric Acids; D012756:Sheep / Q000378:metabolism*; D012995:Solubility
chemical_list: D003692:Delayed-Action Preparations; D010756:Phosphoric Acids; D003300:Copper; C030242:phosphoric acid; C030973:cupric oxide