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Mass Balance of Nitrogen Loading <br /> g drag ... q <br /> Nitrate loading Calculations for properties: <br /> iaefuiition:Au is the abbreviation for animal unit.One animal unit represents 7000 lbs.of body weight. <br /> Nitrogen content of manure from da!ry cattle: <br /> Classification of-cow: <br /> Lacta#ing couvs , Lbs N per Au <br /> Dryl cows 56 lbs <br /> Bred Heifers 45 lbs <br /> Helfers .45 <br /> Carves .45 <br /> FAbyc'Ives.b .45 lbs45 Ibs. <br /> nimal units for typical Holstein dal cattle generally dairy ,9 y accepted by the State Water Quality Control Board: <br /> Lactating cow 1.4 Au's <br /> P <br /> ry.ccws 1.4,u'ss <br /> red'Heifers1.02 Au's <br /> eifer(1 yr.-bred) 1.02 Au's <br /> Calves{3 mo.-1 yr.) .49 Au's <br /> Baby caldes .29 Au's <br /> Nitrogen Production Calculations <br /> Projected.animal units: <br /> t Animals A.U.'s each A.U, <br /> Lactating cows 1904 1.4 <br /> Dry cows 2660 <br /> Bred•Heifers 309 1.12 346 1 <br /> Heifgrs(1 qr.-breeding) 1004 1.02 1024335 1.02 <br /> Calves 341 <br /> aby calves 1004 0.49 335 4 <br /> 0.29 92 <br /> Nit r' en Production <br /> n <br /> Flushed Freestalls <br /> F . Type of Animal A.U,'s Ib of Nlday N/day <br /> act,iLliing cows <br /> 1.. 2,660 -0:56. <br /> Dry c 1,430 <br /> cows <br /> BredHeife0.45 0rs 1,024" l}.45 <br /> rleifgT(1 yr".-breeding) 461 <br /> 341 0.45= 154 <br /> slues. . 4920.45`. 221" <br /> Babybalves 97 0:45 <br /> ! 44 <br /> rotal lbs.N per day before losses 2,369 <br /> i,kiiii6d'F69d Lane <br /> Lacta'dng CDWS ry:• <br /> rl_ eiry cows, r 0.56 0 <br /> fer� <br /> Heifers 0.45 <br /> (1 yr.-breeding) 0.455 0 <br /> Calves- 0.45 0 <br /> Baby calves 0.45 0 <br /> r 0.45 0 <br /> Total lbs,N per day before losses 0 " <br /> i <br /> Scraped Corral <br /> actating cows0.56" 0 <br /> dry cows 0.45 156 <br /> 3red i-ieifors 0.45 0 <br /> Heifers"(1 yr.-breeding) <br /> Calve0.45 0 <br /> s t <br /> 3aby calves + 0.45 0 <br /> '{t$ 0.45 0 <br /> focal lbs.N per day before losses 156 <br /> r <br /> S <br />