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1.. Nitrogen production from: Classification of animal: #Au's Lbs N/Au Lbs N per day Lactating cows 4228 x 0.56 2,368 Dry cows and bred heifers 456 x 0.45 205 Heifers(I yr.-breeding) 0 x .0 0 Calves 0 x .0 0 Baby calves 0 x .0 0 Total lbs.N per day before losses 2,573 Nitrogen collection calculations: Dry: Wet: Cattle in freestalls and flushed concrete lanes: Collected @ Flushed From Corrals: 20% Cow Lanes: 80% Lactating cows @ 2,368 lbs N per day 4741bs 1894 lbs Dry cows @ 205 lbs N per day 41 lbs 164 lbs Bred heifers @ 0 lbs N per day 0 lbs 0 lbs 3 Calves-3 mos. to 1 yr. @ 0 lbs N per day 0 lbs 0 lbs Baby calves @ 0 lbs N per day 0 lbs 0 lbs Total Nitrogen collected per day: 515 lbs per day,Dry 2,058 lbs per day,Wet *Nitrogen flushed from concrete cow lanes will flow through settling ponds. Settling ponds typically collect 80%of the solids prior to reaching the lagoon. r Settling ponds retain approximately 20%of the nitrogen prior to reaching the lagoon. f Lbs of flushed nitrogen collected in settling pond 2,058 x 20= 412 lbs. per day Lbs of nitrogen reaching anaerobic lagoon 2,058 x.80= 1,646 lbs_per day Yearly nitrogenproduction: Total nitrogen in solids per year from corrals: 515 x 365= 189,975 lbs. N per year Total nitrogen in solids per year in aerobic settling pond: 412 x 365= 150,380 lbs. N per year Total nitrogen in liquids at anaerobic lagoon: 1,646 x 365= 600,790 lbs. N per year rF Nitrogen retention(lasses)calculations from storage: I Nitrogen retained from storage in dry lot corrals: . 55-70% Use 60% Nitrogen retained from storage in aerobic settling pond: 35-45% Use 40% Nitrogen retained from storage in anaerobic lagoons: 20-35% Use 25% Lbs of nitrogen year available after losses in storage: � per y age: Solids: N in solids from corrals: 189,975 x.60= 113,985 lbs. N in solids from aerobic setting pond: 150,380 x.40= 60,152 lbs. Total nitrogen in solids: 174,137 lbs. i. Liquids: N in liquids from anaerobic lagoon 600,790 x.25= 150,197 lbs. Total nitrogen before losses available to crops from both solids and liquids: 324,334 lbs. Fi Western Design/David Avila 2000 38