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Mass Balance of Nitrogen Loading <br /> Nitrate loading calculations for properties: <br /> Definition:Au is the abbreviation for animal unit.One animal unit represents 1000 lbsof body weight. <br /> Nitrogen content of manure from dairy cattle. <br /> _ Classification of cow- Lbs N per Au <br /> Lactating cows 56 lbs <br /> Dry cows 45 lbs. <br /> Bred Heifers 45 lbs <br /> Heifers45 lbs. <br /> — Calves 45 lbs. <br /> Baby calves 45 lbs. <br /> Animal units for typical Holstein dairy cattle.generally accepted by the State Water Quality Control Board: <br /> Lactating cow 1 4 Au's <br /> Dry cows 1 12 Au's <br /> Bred Heifers 1.02 Au's <br /> Heifer(1 yr.-bred) 1.02 Au's <br /> Calves(3 me- 1 yr.) 49 Au s <br /> Baby calves 29 Au's <br /> Nitrogen Production Calculations <br /> _ Projected animal units Animals A U's each A.U.'s <br /> Lactating cows 960 1.4 1344 <br /> 'cows 156 112 175 <br /> Bred Heifers 507 1.02 517 <br /> Heifers 0 yr-breeding) 169 1.02 172 <br /> Calves 507 0.49 248 <br /> Baby calves 169 0.29 49 <br /> Nitrogen Production <br /> Flushed Freastalls <br /> type of Animal A U's Ib of N/day N/day <br /> Lactating cows 1.344 0.56 753 <br /> Dry cows 0 0.45 0 <br /> Bred Heifers 517 0.45 233 <br /> Herfers(1 yr-breeding) 0 0.45 0 <br /> Calves 248 045 112 <br /> Baby calves 49 045 22 <br /> Total lbs. N per day before losses 1.119 <br /> Flwhed Feed Lane <br /> _ Lactating cows 0 056 0 <br /> Dry cows 0 0.45 0 <br /> Bred Heifers 0 045 0 <br /> Heifers(1 yr-breeding) 0 045 0 <br /> Calves 0 045 <br /> 0 <br /> — Baby calves 0 045 0 <br /> Total lbs N per day before losses 0 <br /> Scraped Corral <br /> Lactating cows 0 056 0 <br /> Dry cows 175 045 79 <br /> Bred Heifers 0 0.45 0 <br /> _ Heifers(1 yr breeding) 172 045 78 <br /> Calves 0 045 <br /> Baby calves 0 <br /> 0 046 0 <br /> Total lbs N per day before losses 156 <br />