Recent public concern about air pollution from pork production units has prompted more research to develop methods to reduce and control odors. Masking agents, enzymes and bacterial preparations, feed additives, chemicals, oxidation processes, air scrubbers, biofilters, and new ventilation systems have been studied. Research relating the effects of the @entity1707 diet on manure odors has been scarce. Introducing feed additives to bind @entity3265 , change digesta pH, affect specific enzyme activity, and mask odors has been either costly or not consistently successful. Recent research emphasis has focused on manipulating the diet 1) to increase the nutrient utilization of the diet to reduce excretion products, 2) to enhance microbial metabolism in the lower digestive tract to reduce excretion of odor-causing compounds, and 3) to change the physical characteristics of urine and feces to reduce odor emissions. Primary odor-causing compounds evolve from excess degradable proteins and lack of specific fermentable @entity3363 during microbial fermentation. Reductions in @entity3265 emissions by 28 to 79% through diet modifications have been reported. Limited research on reduction of other odorous volatile organic compounds through diet modifications is promising. Use of synthetic @entity1522 with reduced intact protein levels in diets significantly reduces @entity1568 excretions and odor production. Addition of nonstarch polysaccharides and specific oligosaccharides further alters the pathway of @entity1568 excretion and reduces odor emission. Continued nutritional and microbial research to incorporate protein degradation products, especially @entity599 -containing organics, with fermentable @entity3363 in the lower gastrointestinal tract of @entity1707 will further control odors from manure.

Potential for reduction of odorous compounds in XXXX manure through diet modification.

@entity1707 :: ('9823', 'Species') :: ['pigs', 'swine'] @entity1522 :: ('CHEBI:33709', 'Chemical') :: ['amino acids'] @entity1568 :: ('MESH:D009584', 'Chemical') :: ['nitrogen'] @entity3265 :: ('MESH:D000641', 'Chemical') :: ['ammonia'] @entity599 :: ('MESH:D013455', 'Chemical') :: ['sulfur'] @entity3363 :: ('MESH:D002241', 'Chemical') :: ['carbohydrates']
@entity1707 :: (9823,Species) :: ['swine']
