بهاالدین عالم زاده
حسن فضائلی
عزیز کردونی
محمد رضا مشایخی

In this experiment from 21 feeds tuffs included: cereal straw, sesam straw, barley, rice barn, sugarcane pith, sugarbeet tops and crown and alfalfa in 3 stages of flowering and two stages of Harvesting in Khuzestan samples have been collected systematic and randomly. The chemical composition of samples has been determined in laboratory and has been done according to the method of feacal collection. The nutritive value and digestible efficiency of enriched pith, suagarcane tops silage, maize silage, sugarbeet tops and crown silage has been determined. According to the results, the organic matter, crude protein, crude fiber, TDN and digestible energy of vetch straw was, 81.2, 9.9, 21.5, 48.7 percent and 2.02 MCal/kg respectively, and for sesam straw was 80.4, 12.4, 18.2, 42.4% and 1.92 MCal/kg, and for wheat straw it was 90.7, 2.5, 41.5, 43.6% and 1.86 MCal/kg, and for barley straw, 91.2, 4.46, 37.9, 47.8% and 2.09 MCal/kg and it was 84.3, 4.7, 35.3, 44.83% and 1.81 MCal/kg for rice straw, respectively. The above composition for barley grain was 96.7, 13.6, 7.6, 76.1% and 3.22 MCal/kg, for rice barn, 80.97, 6.7, 26.8, 48.4% and 1.92 MCal/kg respectively. The composition of agricultural by- products such as, sugar cane pith was 91.4, 2.2, 47.16, 39.02% and 1.96 MCal/kg for enriched pith, 91.5, 7.42, 35, 50.15% and 1.95 MCal/kg. The composition of different type of silages, such as sugarcane tops was 89, 7.5, 37.6, 48.2% and 2.23 MCal/kg maize silage, 92, 7.8, 27.63% , 8% and 3.08 MCal/kg, sugarbeet tops and crown silage, 74.5, 17.5, 18.2, 42.3% and 1.9 MCal/kg. The composition of alfalfa in the first flowering and harvesting was 91.8, 17.7, 30, 55.8% and 2.4 MCal/kg respectively in the second flowering and first harvesting it was 90.8, 13.8, 34.4, 54.7% and 2.41 MCal/kg respectively it was 91.3, 14.5, 31.4, 52.6% and 2.26 MCal/kg respectively and for alfalfa in the third flowering and first harvesting it was 90.6, 12.9, 33.1, 56.1%, 2.54 MCal/kg and in the second harvesting it was 91.5, 12.5, 34.1, 54.7% and 2.39 MCal/kg respectively.