Soaking and pelleting of pig diets alters the apparent absorption and retention of minerals
1999
Larsen, T. | Skoglund, E. | Sandberg, A.S. | Engberg, R.M.
The effect of soaking a pig's diet in water (9 h at room temperature) or heat pelleting (81 degrees C) on apparent absorption and retention of intrinsic minerals was studied with and without the addition of calcium carbonate in a 2 x 3 factorial design. Thirty pigs were allocated to different diet treatments and two separate balances were calculated throughout a 33-d study. Soaking the diet significantly (P < 0.001) reduced the phytate content (IP(6)) and increased (P < 0.001) the fractional content of degradation products (IP(3-5)), whereas heat pelleting only marginally affected these compounds. Soaking and heat pelleting of feeds did not affect dry matter (DM) digestibility or N and S balances in the animals (P > 0.05), indicating that feed matrix remained unaltered by the treatments. Dietary Ca addition reduced the absorption coefficient of DM (P < 0.01), ash (P < 0.001) and Ca (P < 0.05) as well as the uptake of P (P < 0.001). Heat pelleting selectively reduced the uptake of feed Ca, Fe, Zn, Cu, and Mn compared with untreated and soaked diets (P < 0.05). In conclusion, heat pelleting of feeds showed a negative effect on mineral uptake, whereas the soaking procedure seemed to have only a very marginal positive (P > 0.05) effect on the uptake of elements in the digestive tract.
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