Characterizing Fecal and Manure Phosphorus from Pigs Fed Phytase Supplemented Diets

Abstract

We conducted this study to characterize phosphorus (P) forms in feces and manure from pigs fed phytase supplemented diets and to determine if higher phytase levels can result in greater reduction in manure P without increased P solubility. Twenty-eight growing pigs were fed diets containing varying levels of supplemental P and phytase. Phosphorus concentrations in feces, urine and manure were determined and fecal and manure P were fractionated. Phytase addition reduced P concentration in feces and manure but increased urine P concentration. The greatest significant reduction in fecal and manure P was in pigs fed diet containing 2000 U phytase kg -1 without supplemental P, with 33% reduction in manure P. Inorganic P constituted more than 85% of fecal and manure P and the percentage decreased with phytase addition. Our study showed that higher phytase levels up to 2000 U phytase kg -1 could offer additional advantage of reducing manure P concentration and solubility.

Performance and nutrient digestibility in growing pigs fed wheat dried distillers’ grain with solubles‐containing diets supplemented with phytase and multi‐carbohydrase

“…The increased P retention and urinary P excretion with phytase addition was indicative of improved P digestibility and greater P absorption in pigs following phytase addition, but of reduced efficiency of utilization of the absorbed P (Zhang et al ). Previous studies by Ige et al () and Abioye et al () had also shown that phytase supplementation to pig diets resulted in increased urinary P excretion. Nitrogen balance was not affected by phytase supplementation, likely due to lack of effect of phytase on N digestibility.…”

Validation of PigBal model predictions for pig manure production

“…Previous research (Omogbenigun et al 2003;Maguire et al 2005;Abioye et al 2010) has shown that the inclusion of phytase in pig diets decreases total P excretion.…”

Farm‐level Economic and Water Quality Impacts of Comprehensive Nutrient Management Plan Implementation in the Ohio River Basin

“…Microbial phytase supplementation of livestock rations was simulated for operations involving monogastric animals, and reduced phosphorus diets were simulated for dairy and beef cattle operations. Both ration modifications have been implemented in various watersheds and documented in the academic literature (Honeyman, ; Keith et al ., ; Abioye et al ., ).…”

“…Reduced phosphorus diets were simulated by turning off additional dietary phosphorus supplementation in the economic model, setting tighter bounds on dietary phosphorus concentration as percent of dry matter intake for economic simulations, and adjusting manure phosphorus production levels in accordance with published estimates. Manure P reductions used for this study were 30% for the reduced P diet (McNitt et al ., ) and 35% for the phytase supplemented diet (Honeyman, ; Abioye et al ., ). In other words, manure P levels were adjusted to 65% of original levels for representative farms where phytase was implemented and to 70% of their original levels for representative farms where the reduced P diet was simulated as part of the CNMP.…”