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Humbolt-Universität zu Berlin (2000)

Verfahrenstechnische Lösungen für die Milchproduktion bei standortferner Futterstroherzeugung

Gebreselassie, Mulaw

Titre : Verfahrenstechnische Lösungen für die Milchproduktion bei standortferner Futterstroherzeugung

Auteur : Gebreselassie, Mulaw

Université de soutenance : Humbolt-Universität zu Berlin

Grade : Doktor rerum agriculturum (Dr rer agr) 2000

Résumé Due to the unfavourable climatic conditions for forage production, dairy farms around Da-mascus (Syria) are forced to transport straw from far crop growing regions. The dairy farm covered in this study needs about 400 tonnes of straw to be used as feed which has to be transported from a distance of around 800 km. In the study farm straw covers more than 80% of the forage feed provided. At present the straw is chopped and is being transported in plastic sacks utilising only 45 % of the capacity of the trucks. This indicates the need for improve-ment in truck utilisation through optimisation process such as compacting. The cost of straw is mainly influenced by the cost of compacting and transporting the straw from crop producing regions to the dairy farms located at up to 800 km away from the pro-duction centre. This study was therefore undertaken to evaluate the different treatment methods such as physical (chopping, compacting, etc) and chemical (Urea application) in improving the utili-sation of straw as dairy feed. The study has also included the minimisation of transportation cost and reduction of pollution of the environment through an optimisation process. At the same time attempts were made to increase the transport capacity and reduction of the expendi-ture without affecting the quality of the feed. Through the physical and chemical treatments of straw it was possible to improve the feed value of straw which has enabled us to develop a new ration formulation that could be used on the study farm. The use of square bale to compact the straw has reduced diesel consumption which in turn minimises CO2 emission by 46% per year. The chemical treatment employed by using 4% Urea and 50% water of the straw weight was observed to be optimal. Based on the above chemical treatment procedure, an allowance of 5 to 8 kg DM per cow and day was recommended depending on the lactation stage of the cow. The effect of the square baling in conjunction with the Urea treatment at the dairy farm could reduce the yearly feed expenditure of the farm by 13%.

Mots clés : Milchviehhaltung, Verfahrensanalyse, semi-arid, Stroh, Futterstroh, Strohbearbeitung, Harnstoff, Transportanalyse, Transportoptimierung — Dairy, Process analysis, semi-arid, straw, feed straw, straw processing, Urea, transport analysis, transport optimisation

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Page publiée le 11 mars 2008, mise à jour le 13 mai 2019