determination of the nutritive value and digestibility of corn residues in kerman province by invivo technique

for this reason the samples were obtained from three area in kerman province that cartivate corn in large amounts (giroft, kahnooj, baft).the amounts of samples were enough for both voluntary consumption and investigation of digestibility. after that samples had been chopped by electric chopper we sampled again from every sample and its chemical compositions were determined with standard methods. chemical compositions were: dry matter: %90, ash: % 6.75 ,crude protein : % 5.15, crude fiber: % 41.5 , crude fat: % 2.23, adf: % 36.8, calcium: % 0.51, phosphorus: % 0.73.to compensate the probable deficiency of crude protein in corn residuals, cotton seed meal was used in maintenance dose to provide necessary nitrogen for rumen microorganisms. to determine voluntary consumption and digestive coefficients of food components five different diets contains of three diets of corn residual from three cities (baft, giroft, kahnooj) compound with cotton seed meal and diet of wheat straw (usual diet in the area) were used. indigenous male sheep’s were fed by these diets with four repetitions. animals were fed in metabolic cages individually. after separation the effects of cotton seed meal from corn residuals food, average digestibility of this diet (corn residuals) was determined. dry matter: % 43.1± 0.065, crude protein: % 59.6± 0.07, ash: % 32.3± 0.102, crude fiber: % 35.8± 0.125, nfe: % 89.5± 0.092, crude fat: % 34.8± 0.277, adf: %28.5± 0.106, ndf: %38.5± 0.096, gross energy: % 44.2± 0.126, organic matter: % 51.9± 0.068, tdn: %57.1 ±  0.299. to prevent voluntary usage of corn residuals compound with cotton seed meal, diets were plated and then were had within the reach of animals. average voluntary consumption in three treatments were: treatment 1: 1.235 kg/d treatment 2: 1.063 kg/d treatment 3: 1.286 kg/d. tdn of corn residuals in respect to wheat straw were: treatment 1: %52.61, treatment 2: %59.95, treatment 3: %47.29. total digestible nutrients, crude fat, nitrogen free extract (nfe) didn’t differ significantly in treatments. there were no significant differences between tdn and protein. also there were no significant differences between protein and ash. but there was significant differences between digestibility of other nutrients such as organic matter, gross energy, acid detergent fiber (adf), neutral detergent fiber (ndf), crude fiber, dry matter (p< 0.05).