Livestock systems/Description: Difference between revisions
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|Reference=Seré and Steinfeld, 1996; | |Reference=Seré and Steinfeld, 1996; | ||
|Description=For each world region, IMAGE distinguishes two livestock production systems, namely pastoral systems and mixed/industrial systems, on the basis of [[FAO]] studies ([[Seré and Steinfeld, 1996]]). In general, pastoral systems are dominated by extensive ruminant production systems. Mixed and industrial systems are more intensive than pastoral ones, and animal husbandry comprises grazing ruminants and monogastrics. For years up to the present, the distribution of livestock production over the two systems, for each IMAGE region, is constructed from historical data, whereas for future years, this depends on the scenario selected. | |Description=For each world region, IMAGE distinguishes two livestock production systems, namely pastoral systems and mixed/industrial systems, on the basis of [[FAO]] studies ([[Seré and Steinfeld, 1996]]). In general, pastoral systems are dominated by extensive ruminant production systems. Mixed and industrial systems are more intensive than pastoral ones, and animal husbandry comprises grazing ruminants and monogastrics. For years up to the present, the distribution of livestock production over the two systems, for each IMAGE region, is constructed from historical data, whereas for future years, this depends on the scenario selected. | ||
IMAGE distinguishes five animal categories: beef and dairy cattle (large ruminants), goats and sheep as one group (small ruminants) and pigs and poultry (monogastrics). The numbers of animals and their shares per production system are calculated from data on domestic livestock production, per region, provided by the agricultural economy model ( | IMAGE distinguishes five animal categories: beef and dairy cattle (large ruminants), goats and sheep as one group (small ruminants) and pigs and poultry (monogastrics). The numbers of animals and their shares per production system are calculated from data on domestic livestock production, per region, provided by the agricultural economy model ([[Agricultural Economy and forestry]]) ([[Figure 4.2.4.1]]). The number of animals per category is calculated from the total production per region and per animal specific to that region. Stocks of dairy cows ([[POP]]), per country or world region, are obtained from total milk production ([[PROD]]) and the milk production per animal ([[MPH]]): | ||
Animal stocks per region, for the categories beef cattle, pigs, and sheep and goats, is obtained from production and carcass weight ([[CW]]) and off-take rate ([[OR]]): | Animal stocks per region, for the categories beef cattle, pigs, and sheep and goats, is obtained from production and carcass weight ([[CW]]) and off-take rate ([[OR]]): | ||
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The required feed crop production is calculated from feed rations, and this information is communicatedpassed on to the agricultural demand model (Section 4.2.1), where it is added to the data on food crops, to obtain total crop production. The share of grass in feed rations determines total grass consumption, which is used to compute the grassland area per world region, based on grazing intensity (Section 4.2.1). | The required feed crop production is calculated from feed rations, and this information is communicatedpassed on to the agricultural demand model (Section 4.2.1), where it is added to the data on food crops, to obtain total crop production. The share of grass in feed rations determines total grass consumption, which is used to compute the grassland area per world region, based on grazing intensity (Section 4.2.1). | ||
The scenario includes assumptions on milk production per animal for dairy cattle, and carcass weight and off-take rate for beef cattle, pigs, poultry, sheep and goats, and feed conversion rates (FCR) for pigs, poultry, sheep and goats. The changes in these parameters are generally based on the storyline of the scenario, as well as the economic growth scenario. | The scenario includes assumptions on milk production per animal for dairy cattle, and carcass weight and off-take rate for beef cattle, pigs, poultry, sheep and goats, and feed conversion rates (FCR) for pigs, poultry, sheep and goats. The changes in these parameters are generally based on the storyline of the scenario, as well as the economic growth scenario. | ||
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Revision as of 10:42, 16 December 2013
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