Average annual milk yields and lactation lengths by region.
Source
Not traced to any GLEAM document, and GLEAM appears to publish no
such table (whep#881). Searched and ruled out: the GLEAM 3.0 Supplement
S1 workbook; the herd-parameter tables of Supplement S1 of the
Version 2.0 Revision 5 description (Tables 2.4-2.21 give live weights and
replacement, fertility, mortality and age-at-first-calving rates, but no
milk yield and no lactation length); and both model descriptions, in
which MILKyield (Equation 9.1) and the lactation period are
country-level inputs taken from FAOSTAT and national data rather than
defaults – Table 1.2 of the Version 2.0 description lists them under
national/sub-national resolution. GLEAM-i likewise asks the user for
"annual average milk yield per milking cow". Treat the values as
unverified placeholders. No function in R/ reads this object: the Tier
2 lactation energy term takes milk_yield_kg_day from the caller, and
.build_demand_energy() derives it from the FAOSTAT t_head rows.
Examples
gleam_milk_production
#> # A tibble: 9 × 5
#> region species system milk_kg_head_yr lactation_days
#> <chr> <chr> <chr> <dbl> <dbl>
#> 1 Western Europe Cattle Dairy 7500 305
#> 2 North America Cattle Dairy 9500 305
#> 3 Oceania Cattle Dairy 5500 270
#> 4 Latin America Cattle Dairy 2500 240
#> 5 Sub-Saharan Africa Cattle Dairy 800 180
#> 6 South Asia Cattle Dairy 1500 240
#> 7 South Asia Buffalo Dairy 1800 270
#> 8 Western Europe Sheep Dairy 200 180
#> 9 Western Europe Goats Dairy 450 240