Literature review on the influence of milling and pelleting on granulation and physical characteristics, and production cost of pelleted poultry feed
MetadataShow full item record
- Master's theses (IHA) 
The major objective of poultry feeding is the conversion of feedstuff into human food. The economic importance of poultry feeding, becomes apparent when it is realized that 60-70% of the total production cost of poultry production is feed. For this reason, the efficient use of feed is extremely important in broiler production. The objective of this research was to review connections between grinding and the pelleting process, and to describe how digestion processes in poultry were influenced by mash or pelleted feed. This literature showed that that energy consumption is a highly relevant factor of economy of feed industry, and that it is affected by grinding. Thus, main criterions for evaluating optimal particle size in feed were both biotic and economic factors. Comparisons were done with mash and pelleted feed. Mash diet gives greater unification of growth, lower mortality and requires lower use of energy, making it more economical. Poultry has preferences for bigger particles size, so pelleted feed increases feed intake relative to mash. Pelleted feed also results in lower percentage of waste in feeding, and is also easier to handle, transport and store. On the other side, pelleted feed is about 10% more expensive than the other which are not pelleted, largely due to higher energy consumption during production. Recommendations regarding optimum particle size, however, have been contradictory, as the results from feeding trials and different experiments are confounded by a number of factors, including feed physical form, complexity of the diet, grain type, endosperm hardness, grinding method, pellet quality and particle size distribution. On each of this factors possibilities to influence on them are always existing. On the end, however, pelleted feed seems to have more advantages than disadvantages. However, opinions presented in the literature are divided, so more researches is needed to finally conclude which is optimal, mash or pelleted feed.