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Mass Balance of Nitrogen Loading <br /> Phase I <br /> Nitrate loading calculations for existing properties: <br /> Considering the soil type involved, denitification of nitrate nitrogen to the gaseous form as <br /> nitrous oxide or nitrogen gas will likely occur. <br /> Definitions: <br /> o Denitification is the transformation of nitrates or nitrites or nitrous oxide gas occurring <br /> under anaerobic conditions. <br /> o Aerobic is the growing or occurring only in the presence of molecular oxygen. <br /> Au is the abbreviation for animal unit. One animal unit represents 1000 lbs. of body <br /> weight. <br /> Nitrogen content of manure from dairy cattle: <br /> ANIMAL CLASSIFICATION LBS. N)/ Au <br /> Lactating (milking) .56 <br /> — <br /> Dry & Bred Heifer .45 <br /> _ Heifer 1 ear- bred .40 <br /> Calves 3 months — 1 ear .40 <br /> Baby Calves (up to 3 months .40 <br /> Animal units for typical Holstein dairy cattle, generally accepted by the State Water <br /> Quality Control Board: <br /> ANIMAL CLASSIFICATION ANIMAL UNIT (Au) VALUE <br /> Lactating (milking) 1.4 <br /> Dry & Bred Heifer 1.2 <br /> Heifer 1 ear- bred 1.1 <br /> _ Calves 3 months — 1 ear .50 <br /> Baby Calves (up to 3 months .25 <br /> Refer to page 24 for Endnotes and Reference Sources <br /> Nitrate Loading Study <br /> Property Name and Address: Frank Faria Dairy, Inc. 12182 S. Robinson Road,Escalon,CA 95320 <br /> Page 6 <br /> Western Design/David Avila 2001 <br /> Mass Balance of Nitrogen Loading <br /> IXE <br />