Species, production systems, and cohort definitions from GLEAM 3.0.
Format
A tibble with columns:
- species
Animal species.
- production_system
Dairy, Beef, Meat, etc.
- cohort
Age/sex cohort.
- description
Cohort description.
Source
Partly traced (whep#881). The cohort vocabulary corresponds to
FAO. 2022. Global Livestock Environmental Assessment Model, Model
Description, Version 3.0. Rome, FAO, Table 2.1 "Summary of cohorts in
GLEAM", p. 10 (document code cd8425en, served from www.fao.org/3/ and
openknowledge.fao.org), identical to Table 2.1
p. 9 of the Version 2.0 Revision 5 description
(https://www.fao.org/fileadmin/user_upload/gleam/docs/GLEAM_2.0_Model_description.pdf).
The shipped table is not a transcription of it: GLEAM names cohorts
AF/RF/AM/RM/MF/MM (plus MFr/MMr/MFf/MMf for feedlots) within one herd,
whereas this table renames them, crosses them with a
Dairy/Beef/Meat/Other production system GLEAM's Table 2.1 does not have,
and supplies its own description strings. GLEAM publishes no table of
cohort shares; it derives herd structure from the replacement, fertility,
mortality and age-at-first-calving rates in Supplement S1 of the
Version 2.0 description. calculate_cohorts_systems() instead splits a
herd equally, 1 / n per row of this table, so the row COUNT per
(species, production system) is a result-affecting, unsourced assumption:
Cattle Dairy 6 cohorts (16.7% each), Cattle Beef 5 (20% each). Treat the
layout and the implied equal split as unverified.
Examples
gleam_livestock_categories
#> # A tibble: 27 × 4
#> species production_system cohort description
#> <chr> <chr> <chr> <chr>
#> 1 Cattle Dairy Adult Female Milking cows
#> 2 Cattle Dairy Adult Male Bulls
#> 3 Cattle Dairy Replacement Female Heifers
#> 4 Cattle Dairy Replacement Male Young bulls
#> 5 Cattle Dairy Surplus Female Culled heifers
#> 6 Cattle Dairy Surplus Male Calves for meat
#> 7 Cattle Beef Adult Female Breeding cows
#> 8 Cattle Beef Adult Male Bulls
#> 9 Cattle Beef Replacement Female Heifers
#> 10 Cattle Beef Replacement Male Young bulls
#> # ℹ 17 more rows