4.2T1 Training Materials: Video "Livestock Production" (original) (raw)
Video: "Livestock Production"
In the following link you may find the video on "Livestock Production":
Welcome to this video on the second calculation step of the FABLE model: “Computation of the targeted livestock production”. Our objective is to help you learn: How livestock production is calculated? Through which tables? As well as what are the main inputs and outputs of the second calculation worksheet? The computation of the production from the livestock sector is the second step in the FABLE Calculator. The livestock sector supplies animal food products and consumes other agricultural products for animal feed. This explains why we need to compute the production of the livestock sector before the production of the crop sector. The objective of this calculation step is to compute the evolution of the livestock herd which then determines the feed demand and the pasture area which are used in the calculation steps that follow.
The process of calculation steps is as follows:
- The demand for livestock products which has been defined in the calculation of human demand, is the starting point of the calculation of livestock production.
- Next, imports are computed as the share of total consumption which is imported times the consumption for each product and time step.
- The exported quantity is taken from the selected scenario.
- Consumption minus imports plus exports increased by the share of the production which is lost gives the production which is required domestically by animal product and time step.
- The production per animal type and production system is divided by the average productivity to compute the herd for each animal type, production system, and time-step. Productivity depends on the productivity shifter in the selected animal productivity scenario.
- The total herd number for ruminants (cattle, sheep, and goats) is the starting point for the calculation of the pasture area. We then divide the number of ruminants by the average ruminant density per hectare to obtain the targeted pasture area. By default, historical ruminant density is computed using FAOSTAT’s ruminant numbers divided by the grassland area for 2000, 2005, and 2010 and kept constant at 2010 levels over 2015-2050. However, an optional update package for implementing alternative scenarios on the evolution of the ruminant density is available (cf. Ruminant density).
Now that we have a panoramic overview of the steps to calculate livestock production, let us go find the needle in the haystack, of how these calculation steps look with more detail in the calculator 😊. Livestock production is calculated in the FABLE model in the green calculation sheet worksheet called 2_calc_livestock, using data from the respective gray worksheet called 2_data_livestock. The main calculations comprise Tables 2.A through 2.J. In the beginning of Table 2.A, you can see all the relevant scenarios that are required at this level of calculations. Let us now revise the rest of the tables with more detail.
As revised in the previous slide, the main input to this worksheet is the calculation of human demand for livestock products, which is recalled into this worksheet by the last column in the first set of tables, column called [consotot].
Table 2.C then calculates production, consumption and trade of livestock products, ending in the column [prodanim], or production by product by animal type. Table 2.B then transforms this value through productivity data into final Herd numbers, in the column [RealHerd]
The value of herd will then be used in different parts of the calculator, to account for how much pasture is needed for the feed necessary for such herd, and how much emissions are resulting from these activities. In the current worksheet, Tables 2.E through 2.I calculate the “Herd size and corresponding feed” (2.F), relevant to selected scenarios (2.E), and the Herd size and corresponding pasture (2.I), emissions (2.H), according to selected scenarios (2.G).
You may have noticed that I have skipped two tables in the explanation above: Table 2.D, called “chk_herd” and Table 2.J, called “Chk_animproducts”. These two tables are a useful tool to check that the economic balance in the calculator is maintained, both for the total amount of herd, as well as for all livestock products, respectively, when compared to historical values. We will look at these tables more in detail in the next quiz and exercise. Get your notebooks and calculators ready!
#FABLE #FABLECalculator #FABLEConsortium
For more information on the FABLE Calculator:
• https://www.abstract-landscapes.com/fable-calculator
• https://github.com/FABLE-Github/Fable-Calculator-Documentation-2020/wiki
For more information on the FABLE Consortium:
• https://www.foodandlandusecoalition.org/fable/
The 2020 FABLE Report:
• http://pure.iiasa.ac.at/id/eprint/16896/
------------------------------------------------------------ Content ---------------------------------------------------------------
0:00 - Welcome
0:41 - Review: calculation steps
1:00 – Overview of how livestock production is calculated
2:31 - How is the calculation of livestock production done in the Excel model? Tables 2.A-2.C
4:01 – How is the calculation of livestock production done in the Excel model? Tables 2.E-2.I
4:38 – Tables 2.D and 2.J
5:15 – Links to FABLE Websites (to click on them, also included in the video description)