39310a5e-f5e1-4c77-8f2f-5b1d10d21fce
isee systems, inc.
0
120
4
1
dmnl
unitless
fraction
lb
pound
mo
month
1/Months
lb/mo
lb/head/mo
lb/head
AU/head
AU
initial_cows
maturing_cows
culling_cows
head
Cows/average_life_span
head/months
4*12
months
culling_cows*time_to_mature
keeping_heifers
maturing_cows
time_to_mature
head
0
head/months
0
head/months
0.8 { this is really per year - fraction impregnated takes care of that }
per month
16.5 { total time 18-24 months }
months
0, 532.8, 534.4, 532.8, 0
procreating
being_born
time_to_gestate
head
fertility_rate*fraction_impregnated*Cows
head/months
283/365*12
months
Points must sum to 1.
COUNTER(0, 12)
0,0,0,0,0.333,0.334,0.333,0,0,0,0,0,0
dimensionless
2000
head
0
being_born
weaning_calves
calf_deaths
time_to_wean
head
2.5
months
0
head/months
MAX(maturing_calves - keeping_heifers, 0)
head/months
milking_productivity*Cows/1e6 { million }
pounds per month
Generate milk about 305 days per year at an average of 20.2K lbs over this period (US).
20200/305*365/12
pounds per head per month
(fertility_rate*initial_cows/12)*time_to_finish_calves
{ average number of calves per month times average stay here }
weaning_calves
keeping_heifers
selling_young
head
2
months
desired_cow_replacement
head/months
desired_cows - Cows - Heifers
head
MAX(gap_in_cows/time_to_replace_cows + culling_cows, 0)
head/months
Must be <= time to finish calves
0.5
months
Weaned_Calves/time_to_finish_calves
head/months
initial_cows + INIT(culling_cows)*INIT(time_to_mature) { Heifers }
head
calf_death_fraction
head/months
0.01
dimensionless
Cows
culling_cows
average_life_span
culling_cows
fertility_rate
procreating
Cows
procreating
milking_productivity
milk_production
Cows
milk_production
fraction_impregnated
procreating
Cows
gap_in_cows
gap_in_cows
desired_cow_replacement
culling_cows
desired_cow_replacement
time_to_replace_cows
desired_cow_replacement
desired_cow_replacement
keeping_heifers
Weaned_Calves
maturing_calves
time_to_finish_calves
maturing_calves
Heifers
gap_in_cows
initial_cows
desired_cows
culling_cows
desired_cows
desired_cows
calf_death_fraction
calf_deaths
maturing_calves
selling_young
keeping_heifers
selling_young
desired_cows
gap_in_cows
time_to_mature