Kinetics of phosphorus in goat tissues

Abstract

Nine castrated male alpine goats were kept in metabolism cages for 29 days, receiving a diet consisted of hay and concentrate mixture. Treatments consisted of different amounts of dicalcium phosphate added to the concentrate to give 0, 1 or 2 g P/animal/day. At the 22^nd day 7.4 MBq ³²P were injected into each animal through left jugular vein. On the 8^th day after injection the animals were slaughtered and tissues samples were collected. The results were submitted to regression analysis. P content in heart, muscle and kidney showed significant positive relationship with P intake; and liver and bone did not. The ³²P retention showed similar and significantly highest values for bone, followed by liver, kidney, heart and lowest values for muscle, and showed a significantly negative linear relationship with the P content in diet for all tissues. The standard and relative specific activity (SA) showed significantly highest values for kidney, heart, liver and lowest values for muscle and bone. The standard SA showed a significantly negative linear relationship with the P intake for all tissues but not the relative SA. To sum up, these results show that P intake can determine the P levels in some tissues and the kinetics of the element among compartments.