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Effects of Different Dietary Acidifier Sources of Calcium and Phosphorus on Ammonia, Methane and Odorant Emission from Growing-finishing Pigs
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 Title & Authors
Effects of Different Dietary Acidifier Sources of Calcium and Phosphorus on Ammonia, Methane and Odorant Emission from Growing-finishing Pigs
Kim, I.B.; Ferke, P.R.; Powers, W.J.; Stein, H.H.; Van Kempe, T.A.T.G.;
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The objective of this study was to investigate the effects of different sources of Ca and P on urine and ileal digesta pH, and ammonia (), methane (), and odor emission. In experiment 1, eight pigs (commercial three-way cross; initial BW 673 kg) were arranged in a repeated 44 Latin Square design. All pigs were equipped with a T-cannula in the distal ileum. Four corn-soybean meal based diets were formulated. Diet 1 was the control in which dicalcium phosphate (DCP) and limestone () were used as the sources of inorganic P and Ca. In Diets 2 and 3, , monocalcium phosphate (MCP), and replaced DCP and as the inorganic sources of P and Ca. Diet 4 was similar to Diet 1 except that it was fortified with HCl to provide an acid load similar to that of diet 2. Urine and ileal digesta pH were determined in pigs fed each of these diets. In Exp. 1, urine pH decreased (p<0.05) in animals consuming diets containing - (5.850.38) and MCP-(5.730.30) compared with the DCP- diet (6.890.24). In the pigs consuming -, ileal digesta pH decreased compared with the control (5.520.28 vs. 6.660.17; p<0.05). Based on the results of Exp. 1, a total of four trials were performed in environmental chambers for determining how , , and odor were affected by the different dietary Ca and P sources (Exp. 2). In Exp. 2, pigs fed the - diet had decreased (30%) emissions compared with the control (p<0.05). Also, a combination of MCP-- decreased emission by 15% (p<0.05). Emission of was decreased only with the - diet with 14% (p<0.05). Odorant emission of phenolics and volatile fatty acids increased roughly three-fold with the DCP- diet but was not affected by other test diets. In conclusion, acidogenic Ca and P sources in swine diets can decrease the urinary pH and reduce and emission from swine facilities.
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