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Universität für Bodenkultur Wien (2010)

Modelling of ecological and economic sustainability of a pastoral production system in Uganda

Mulindwa, Henry Earon

Titre : Modelling of ecological and economic sustainability of a pastoral production system in Uganda

Modellierung der ökologischen und ökonomischen Nachhaltigkeit eines weidebasierten Rinderhaltungssystems in Uganda

Auteur : Mulindwa, Henry Earon

Université de soutenance : Universität für Bodenkultur Wien

Grade : Doktorgrade 2010

Résumé
A study was carried out in South Western Uganda were pastoralists keep two herds of pure Ankole cattle and Ankole-Holstein Friesian crossbreds. The aim of the study was to evaluate the long term productivity of the pastoral production, identify its production constraints and evaluate alternative management options. Continuous grazing was predominant though there was an effort to establish paddocks. Crossbreds grazed pasture had 0.17t/ha dry matter more than the range grazed by pure Ankole cattle. The crude protein content in pastures grazed by pure Ankole (6.30%) was significantly (P<0.05) lower compared to Ankole-Friesian crossbred grazed range (7.25 %). Fiber (NDF) content was relatively similar (72.82% vs. 69.77%) in both range types. Using a stochastic dynamic simulation model developed in STELLA software, the overall annual forage production was found to be 390572kg/ha. The lowest carrying capacity (CC) (5.56 ha/tropical livestock unit [TLU]) occurs between June to August while the highest CC (1.41ha/TLU) occurs in September to November. Sixty three percent of the surveyed farms have stocking rates that were higher than the CC throughout the year while the rest were overstocked in the dry seasons of the year. The developed simulation model was evaluated and the relative prediction error (RPE) values for body weight after weaning (7 to 18 months of age) across both breeds ranged from 3% to 12% which is below the acceptable limit of 20%. The RPE for pasture production and milk yield across seasons were 17.6% and 3.33% respectively. Economic analyses were conducted for a number of alternative management options. The average monthly and annual incomes were higher (17.3%) in the control scenario than in the reduced open period and shorter lactation length scenario. The optimal stocking rate set at 1.5 ha/TLU had a higher (2%) income compared to the control group (uncontrolled stocking rate) even though its overall average TLU was less by 28.28TLU. Daily milk yield in the Ankole-Friesian crossbred herd was generally higher (0.3kg) in the restricted breeding season than the year round breeding scenario. The stocking rate that is ecologically sustainable and economically viable for Ankole pastoral production system has been found to be around 1.5ha/TLU.

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