An experiment was conducted at the Organic Research Farm, Federal University of Agriculture, Abeokuta between September 2013 and March 2014 to evaluate the influence of manure type and season on the chemical composition of plant fractions of Pennisetum purpureum varieties. The experiment was a split-split plot design with 4 manure types: swine (10.16 kg), cattle (22 kg), poultry (7.92 kg)/plot and control) were applied in one application as the main plot, 4 varieties of P. purpureum (green, purple, S13and S15) as the sub-plot and 2 seasons (early and late dry season) as the sub-sub plot with 3 replicates. An area of land of 53m × 11m was divided into individual plot size of 2m² after land clearing and was sown with P. purpureum stems. The level of manure application was determined according to the nitrogen need of the soil which contained: total N (0.15%), organic C (1.31%), and available P (32.87 mg kg-1). Forage subsamples were harvested after 12 weeks of growth, weighed and oven-dried. Analysis of proximate and fiber contents of leaves and stem fractions was carried out and data obtained were analyzed using GLM procedure of SPSS Statistics 20. Results from this experiment showed (P < 0.05) CP content of P. purpureum leaves was highest in early dry and late dry seasons for swine manure (25.94%, 21.94%) compared with control (24.86%, 21.83), cattle (25.53%, 18.49%) and poultry (24.19%, 18.04%) respectively. P. purpureum variety Local green had the highest (P < 0.05) CP content (23.32%) in leaf fractions while P. purpureum variety purple had the highest (P < 0.05) CP (4.73%) in stem fractions. Cellulose contents of leaf (42%) of the grasses harvested in the early dry season was higher (P < 0.05) than those harvested in the late dry season. The ADL content were lower (P < 0.05) in the leaves than in the stem fractions in all the parameters measured. Feeding values of all the varieties (DDM, DMI, RFV and FI) were higher (P < 0.05) in the leaf fractions than stem fractions. It could therefore be concluded that swine manure is a good source of nutrient for sown pasture production and the use of animal manures maintained the quality of the grasses throughout the dry season.