#05-111

Complete

Date Full Report Received

12/12/2006

Date Abstract Report Received

12/12/2006

Investigation

Institution:
Primary Investigator:
Co-Investigators: Brian Kerr, Ken Stalder

Corn co-products are an increasingly important alternative to corn in swine diets. While there has been some research to evaluate how these co-products affect pig performance, the effect on air emissions was poorly documented. As a result, a study was conducted to see how feeding distillers dried grains with solubles (DDGs), corn germ meal (CGM), and dehulled, degermed corn (DDC) would alter air emissions as compared to a traditional corn diet (C ). Generally, ammonia and hydrogen sulfide emissions increased as a result of feeding the DDGs diets, relative to the corn diets in the animal housing area. Corn and DDGs diets produced less methane emissions than the DDC and CGM diets. No diet effects were observed for non-methane total hydrocarbon emissions. When emissions from the manure, alone were considered the findings were contrary to that observed in the animal housing areas. The corn diet produced greater methane emissions while the CGM diet resulted in less ammonia emissions that the other treatments. This suggests that manures from pigs fed different diets metabolize differently over time producing emissions that may be unlike that observed during a period when the manure is in the animal housing area for a short time period. Within this study no performance differences were observed when corn co-products were fed at increasing levels of the diet (from 5 to 30% as pigs aged over the course of six feeding phases) suggesting that there may be value in considering greater inclusions than is currently practiced if there are also no negative carcass quality effects. It is imperative that as producers include DDGs in their diet formulations, they consider the added N and S and account for those nutrients in the formulation rather than feeding DDGs solely as an energy source