| Summary: | 碩士 === 國立嘉義大學 === 動物科學系研究所 === 107 === The study wad divided into four parts. The First part is to investigate the effects of different concentrations of fermentation products from Aspergillus flavus (AF) or Aspergillus niger (AN) on growth performance in broilers. 360 Ross 308 female broilers were randomly distributed into groups in which diet supplemented with 0, 0.05, 0.10, 0.15 and 0.20% AF or AN fermentation products, respectively. There were 4 replicates in each treatment and chickens were ad libitum access to food and water and the experiment last for 35 days. Result showed that the AF and AN fermentation products could improve growth performance of broilers. And 0.20% AN and 0.15% AF groups had better improvements than others. The Second part is the effect of different fermemtation substrates with moisture content on the solid-fermemtation condition for AN, AF, and AO. Resuls showed that the growth rate of mycelium and spore color of AN reached an ideal condition when soybean hull was selected as a solid fermentation substrate with 60% moisture. The ability of AO to decompose different subtrates was less AN and AF. All strains in this test showed certain decomposition ability. The third part is to investigate the effects of different Aspergillus fermentation products on growth performance of broilers. 200 0-day-old female broilers (ROSS 308) were randomly distributed into diets with 0.1% AN fermentation products used wheat bran as solid-fermentation substrates as positive control, 0% (control group) or 0.1% AO and AN fermentation products used soybean hull as solid-fermentation substrates were added to the corn-soybean meal base diet. There were 4 replicates in each treatment and the experiment last for 21 days. Results showed that despite of positive effect on body weight and weight gain in the early stage in 0.1% AO group, AN and AF showed the better performance in FCR. Furthermore, 0.1% AO has the best PEF. These results showed that 0.1% AO fermentation product used soybean hull as solid-fermentation substrates has the best performance in the early stage in broiler. The purpose of fourth part is to investigate the effect of adding different amounts of Aspergillus fermentation products on the growth, carcass, physiology of digestive tract and clinical blood biochemistry in broilers. The results showed that the addition of 0.05% AO + 0.05% AN fermentation product in broiler diet could improve growth performance and carcass traits (P <0.05). In respect to the blood biochemistry, despite the level of Ca in serum in 0.10% AN group was significantly different (P < 0.05) than other group, other results in 0.05% AO, 0.02% AO, 0.05% AN + 0.05% AO fermentation product group were similar to control group . In conclusion, Aspergillus fermentation products have positive effect on growth performance, and supplementing 0.05% AN and 0.05% AO in diet have the best potential to develop as a economic feed additive in broiler.
Key words: Aspergillus spp., solid-state fermentation, soybean hulls, broiler
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