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Eighteen multiparous Holstein cows were used to study the long term effect of reducing dietary P concentration on intake of DM and milk yield, on blood levels of inorganic phosphate (P i ), Ca, vitamin D 3 , parathyroid hormone (PTH) as well as assessing bone turnover by the use of bone formation marker osteocalcin (OC) and bone resorption marker cross-linked carboxy-terminal telopeptide...
Five ruminally cannulated lactating Holstein cows, fitted with permanent indwelling catheters in the mesenteric vein, hepatic vein, portal vein, and an artery were used to study intestinal absorption and net recycling of inorganic phosphate (P i ) to the gastrointestinal tract. Treatments were low P (LP; 2.4g of P/kg of DM) and high P (HP; 3.4g of P/kg of DM). The dietary total P (tP) concentrations...
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