Environment

 Industry Partners


Prairie Swine Centre is an affiliate of the University of Saskatchewan


Prairie Swine Centre is grateful for the assistance of the George Morris Centre in developing the economics portion of Pork Insight.

Financial support for the Enterprise Model Project and Pork Insight has been provided by:



Author(s): C. Martin Nyachoti, Susan D. Arntfield, Wilhem Guenter, Stefan Cenkowski, Ian Seddon, and Denny St. George
Publication Date: January 1, 0000
Country: Canada

Summary:

Nutrient excretion in pig manure and the total amount of manure excreted by pigs presents major challenges to the swine industry and threatens future growth and development of the industry. This is because excessive nutrient excretion (particularly nitrogen and phosphorus) is implicated in environmental pollution while the large volume of manure increases the cost of handling and disposal. Of the many strategies that could be used to address these challenges, nutritional manipulation strategies have been suggested to provide the most effective means. The potential to use micronization (high intensity infrared heating) and enzyme supplementation to reduce nitrogen and phosphorus excretion and manure output from growing pigs fed barley-peas-based diets was investigated in the research project reported herein. The micronization procedure and enzyme supplementation have been reported to increase nutrient utilization in some studies with both poultry and pigs but their value in mitigating nutrient and manure excretion is poorly understood. In this project, three experiments were completed. The effect of micronization on indicators (lysine availability, starch gelatinization, and water extract viscosity) of nutritional value was assessed in Experiment 1. The results showed that micronizing peas at 110-115 C and a moisture content of 25% substantially improved indicators of the nutritive value of peas for pigs and that storage time (up to 6 weeks) had no effect on the composition of dried micronized peas. In Experiments 2 and 3, nitrogen and phosphorus excretion and manure output were determined; ileal and fecal digestibilities of nutrients were determined in Experiment 3 only. Fecal phosphorus excretion was reduced by 27% and 17%, respectively, when pigs were fed diets containing micronized peas with or without enzyme supplementation in Experiment 2. Overall, including micronized peas in pig grower diets reduced total (feces plus urine) phosphorus excretion by 16%. Total nitrogen excretion was reduced by approximately 20% in the two experiments. Enzyme supplementation substantially increased total tract phosphorus digestibly and both micronization and enzyme supplementation substantially improved ileal amino acid digestibilities in the barley-pea based diets. The findings of the current project clearly indicate that the two strategies tested, namely micronization and enzyme supplementation, are useful tools for mitigating environmental concerns associated with pork production. They should be investigated further to optimize their usefulness.

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