This study was aimed to determine the variations into the nutrient contents found different plant parts of maize genotypes that containing high level of oil and protein at their different vegetative stages. In this study, six different maize genotypes were used as plant materials that have been generated by crossing of two special types of maize namely, IHO and IHP with two normal elite inbred lines (B73 and Mo17). Field trials have been conducted by using randomized complete block design along with three replications in the region of northwest of Turkey. Samplings were designed in accordance to plant sowing date and they were taken from the field at 40th, 60th, 82nd, 100th and 122nd days after sowing. Neutral detergent fiber (NDF), acid detergent fiber (ADF), acid detergent lignin (ADL), crude ash (CA), organic matter digestibility (OMD) and dry matter digestibility (DMD) have been investigated during this study work. The results of this research showed that the significant differences were found among genotypes and some sorts of significant variations have been observed into the cell wall components. Genotypes, having high level of protein in their stalks, have been found superior in terms of nutrient content while the genotypes, having high level of oil in their leaves, were found best for nutrient values. (C) 2016 The Authors. Published by Elsevier B.V.