The mechanism of selenium secretion by the mammary gland and effects of dietary copper and selenium metabolism on selenium in milk were investigated. Radioactive sodium selective selenite was injected into the jugular vein of lactating goats fed concentrates containing 15 or 115 ppm copper. Blood and milk samples were collected hourly for 8 h and daily for 1 wk. Whole blood, plasma, whole milk,...

Protein kinase activities and membrane autophosphorylation reactions of normal and abnormal human erythrocytes were analyzed. Erythrocytes from patients with high reticulocytosis due to sickle cell anemia and other disorders (n = 13) exhibited elevated activities of total and membrane-bound cAMP-independent casein kinase and cAMP-stimulated histone kinase. Relative to normal controls (n = 10), ...

The effects of feeding dietary and defatted oyster meat on lipid metabolism were investigated in rats by comparing measurements with those of casein and soybean protein. In the first experiment, male rats were fed 0.1% and 1% cholesterol-supplemented diets containing casein, oyster or soybean protein under the same dietary level of protein (20%). The concentrations of serum and liver cholestero...

The aims of this study were to estimate the effect cow breed on milk protein profile, and assess relationship between profile coagulation properties (MCP) predicted with mid-infrared spectroscopy (MIRS). dataset included 173,841 test-day observations 12,533 specialised (Holstein-Friesian [HF] Brown Swiss [BS]) dual-purpose cows (Simmental [SI] Alpine Grey) sampled in 488 multi-breed herds. Fixe...

In fresh milk, plasminogen, the zymogen form of plasmin (PL), is the predominant form. Therefore, plasminogen activators (PA) can contribute significantly to PL activity in milk. Both tissue-type PA (tPA) and urokinase-type PA (uPA) exist in milk; however, contradictory findings have been reported for which type of PA is most closely associated with the casein micelles. Little is known about th...

The risk of aflatoxin-induced hepatocarcinoma is greater in males than in females and is similarly higher in animals fed 20% casein diets than in those fed 5%. In this study, groups of male and female F344 rats were fed either a 5 or 20% casein diet for 6 weeks. Two hr after a 1-mg/kg i.p. dose of [3H]aflatoxin B1, animals were killed and four protein fractions were sequentially extracted from ...