Coefficients for IPCC Tier 2 GE calculation including
Cfi (maintenance), Ca (activity), Cp (pregnancy),
Cw (work), and energy content of weight gain. Now
includes subcategory column to differentiate dairy
(lactating) vs non-dairy cattle.
Format
A tibble with columns:
- category
Species (Cattle, Buffalo, Sheep, etc.).
- subcategory
Dairy, Non-Dairy, or All.
- cfi_mj_day_kg075
NEm coefficient (MJ/day/kg^0.75).
- ca_pasture
Activity coefficient for grazing.
- ca_feedlot
Activity coefficient for confined.
- cp
Pregnancy coefficient.
- cw
Work coefficient.
- energy_content_gain_mj_kg
Energy per kg gain.
Source
IPCC 2019 Refinement, Vol 4, Ch 10, Eq 10.3-10.16, with
cfi_mj_day_kg075 from Table 10.4 (Updated) and ca_pasture from
Table 10.5 (Updated). Sheep and goats take their own rows in both
tables and must not be conflated: Cfi is 0.217 for sheep older than
one year and 0.315 for goats, and Ca is 0.0107 for sheep grazing flat
pasture and 0.019 for lowland goats. Neither goat value exists in the
2006 Guidelines, whose Table 10.4 has no goat row at all. ca_pasture
takes the lowland/flat-pasture value as the global default; the
published hill and mountain goat coefficient (0.024) is not stored and
must be supplied per row by the caller.
Examples
ipcc_tier2_energy_coefs
#> # A tibble: 6 × 8
#> category subcategory cfi_mj_day_kg075 ca_pasture ca_feedlot cp cw
#> <chr> <chr> <dbl> <dbl> <dbl> <dbl> <dbl>
#> 1 Cattle Dairy 0.386 0.17 0 0.1 0
#> 2 Cattle Non-Dairy 0.322 0.17 0 0.1 0
#> 3 Buffalo Dairy 0.386 0.17 0 0.1 0
#> 4 Buffalo Non-Dairy 0.322 0.17 0 0.1 0
#> 5 Sheep All 0.217 0.0107 0 0.077 0
#> 6 Goats All 0.315 0.019 0 0.077 0
#> # ℹ 1 more variable: energy_content_gain_mj_kg <dbl>