Abstract
Thirty-six entire male and female high genetic merit Large White × (Landrace × Large White) pigs were used in a serial slaughter study spanning the liveweight range 25 to 110 kg. The animals were given a high-quality nutrient-dense diet ad libitum and deposited protein at near-maximal rates (around 150 and 170 g/day for the gilts and boars, respectively). The mineral concentrations of the diet exceeded stated requirements for the pig. The whole-body contents of calcium, phosphorus, sodium, potassium and magnesium were determined and related to the empty body weight, lipid-free body weight or whole-body protein. There was an effect of sex of pig ( P< 0.05) only on the amounts of sodium and potassium per unit whole-body protein. Calcium, phosphorus and magnesium, were retained isometrically with lipid-free body mass whereas the allometric model indicated that the amounts of sodium and potassium per unit lipid-free body declined significantly ( P<0.05) as the animal grew. Functions describing the retention of minerals in the rapidly growing pig are given and can be used in the factorial estimation of mineral requirements.
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