الفهرس 
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Abstract
The present study was conducted at the department of Nutrition and Clinical Nutrition, Faculty of Veterinary Medicine, University of Sadat City to investigate the biotechnological effects of different strains of fungi (Pleurotus Ostreatus , Trichoderma viride and Trichoderma reesei) on the nutritive value of agricultural residues and bacterial treatment by LAB (Lactobacillus Plantarum with or without addition of molasses) for production of good quality straw silage. Four types of straws were applied (rice straw ((RS), bean straw (BS), mixture of rice and bean straw (RBS) and wheat straw (WS) with each Microorganism. Five treatments and control group of each substrate which not inoculated with any micro orgasm. T1 (straws treated by Lactobacillus plantarum with molasses), T2 (straws treated with lactobacillus plantarum without molasses), T3 (straws treated by Trichoderma viride ),T4 (Straws treated by pleurotus ostreatus ) and T5 (Straw treated by Trichoderma reesei). Each treatment was carried out for four types of straws. The results of proximate analysis showed increased crude protein, ether extract and ash contents in all treatment compared to the un treated straws .The biotechnological treatment also led to reduction in dry matter, organic matter, crude fiber and fiber fractions contents in all treatments relative to the control group. Straws treated with Lactic acid bacteria (LAB) showed higher silage quality with lower PH value and higher total volatile fatty acids.