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I <br /> Nitrogen production from: ` <br /> Classification of animal: #Au's Lbs N/Au Lbs N per day <br /> Lactating cows 4,200 x .56 2.352 <br /> Dry cows and bred heifers 1,344 x .45 605 <br /> Heifers(i yr.-breeding) 284 x .40 114 <br /> Calves 387 x .40 155 <br /> Baby calves . 65 x .40 26 <br /> Total lbs.N per day before losses 3,252 <br /> i Nitrogen collection calculations: Dry: Wet: <br /> Cattle in freestalls and flushed concrete lanes: Collected @ Flushed From <br /> Corrals:20% Cow Lanes: 80% <br /> f Lactating cows @ 2,352 lbs N per day 470.4 lbs 1,881.6 tbs <br /> Dry cows @ 184 tbs N per day 36.8 tbs 147.2 lbs <br /> Bred heifers @ 49 tbs N per day 49.8 lbs 199.2 lbs <br /> Calves-3 mos.to I yr. @ 26 tbs N per day 6 lbs 20 lbs <br /> Baby calves @ 26 tbs N per day 61bs 20 lbs <br /> Cattle in corrals and flushed concrete lanes: Collected Dry @ Flushed From <br /> Corrals:40% Cow Lane: 60% <br /> All other cattle @ 615 lbs N per day 246 lbs 369 lbs <br /> Total Nitrogen collected from all areas per day: 8IS lbs per day, Dry 2,637 lbs per day,Wet <br /> *Nitrogen flushed from concrete cow lanes will flow through settling ponds. <br /> Settling ponds typically collect 80%of the solids prior to reaching the lagoon. <br /> 1 Settling ponds retain approximately 20%of the nitrogen prior to reaching the lagoon. <br /> Lbs of flushed nitrogen collected in settling pond 2,637 x.20= 527.4 lbs.per day <br /> Lbs of nitrogen reaching anerobic lagoon 2,637 x.80= 2,109.6 tbs.per day <br /> Yearly nitrogen production: <br /> Total nitrogen in solids per year from corrals: 815 x 365 = 297,475 lbs.N per year <br /> Total nitrogen in solids per year in aerobic settling pond: 527.4 x 365= 192,501 lbs.N per year <br /> Total nitrogen in liquids at anerobic lagoon: 2,109.6 x 365 = 770,004 lbs.N per year <br /> Nitrogen retention(losses)calculations from storage: <br /> Nitrogen retained from storage in dry lot corrals: 55-70% Use 60% <br /> Nitrogen retained from storage in aerobic settling pond: 3545% Use 40% <br /> ' Nitrogen retained from storage in anerobic lagoons: 20-35% Use 25% <br /> Lbs of nitrogen per year available after losses in storage: <br /> Solids: <br /> N in solids from corrals: 297,475 x.60= 178,485 lbs. <br /> N in solids from aerobic setting pond: 192,501 x .40= 77,000 lbs. <br /> Total nitrogen in solids: 255,485 lbs. <br /> Liquids: <br /> N in liquids from anerobic lagoon 770,004 x .25 = 192,501 tbs. <br /> Total nitrogen before losses available to crops from both solids and liquids: 47,986 lbs. <br /> 4 <br /> ®Western Design/David Avila 1999 <br /> ^t <br /> 15 <br /> v -� <br />