Feedstuffs Magazine
Hog Industry Insider
August 13, 2001
By STEVE MARBERY
Feedstuffs Correspondent

Phytase study

Phosphorous in swine manure was reduced 23% in a dietary phytase study
by
animal scientists at Iowa State University’s Pork Industry Center. The
one-year project examined the influence of phytase feeding in finishing
rations. Phytase, an enzyme that metabolizes phytic acid (phytate) and
releases digestible phosphorous, did not reduce average daily gain or
feed
efficiency or increase diet costs, according to a summary coordinated by

Larry McMullen, Iowa State swine specialist. Iowa and other states are
moving toward manure application standards based on phosphorous.
Nitrogen
has been the limiting nutrient for decades. Parts of Iowa and several
other
states have accumulated excess soil phosphorous due to swine density and

larger operations.

Copyright 2001, The Miller Publishing Company, a company of Rural Press
Ltd.

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