The objective of this study was to evaluate the yield and nutritive value of 2 sorghum hybrids (Advanta Seed Alta AF7401 [H1] and Alta XF372 [H2]) planted at densities of 148,260 (D1), 197,680 (D2), 247,105 (D3), 296,526 (D4) and 345,947 (D5) seeds/hectare on yield and nutritive value of whole-plant sorghum forage. The treatments (2 hybrids [H] x 5 plant densities [PD]) were randomly distributed in 4 replicate plots. Plots consisted of 4 rows spaced at 0.762 m apart, at a length of 6.096 m per row. Plots were harvested targeting 31% dry matter (DM). At harvesting, the 3 outermost plants in the center 2 rows were discarded and all remaining plants in a 3-m linear distance were collected, chopped and weighed to calculate yield within the respective row. Subsamples were collected and dried in a forced air oven at 60°C for 48 h for DM determination. Dry samples were then ground to pass through a 4 mm sieve and sent to Dairyland Labs (Arcadia, WI) for nutrient analysis and predicted ruminal in vitro NDF digestibility at 30h (NDFD) using a near infrared spectrometer. Estimated milk production per unit of forage (kg of milk/Mg of forage) or per hectare (kg of milk/ha) were based on the predictive equations of Milk2006. Data were analyzed using PROC GLM of SAS in a complete randomized design with a 5 × 2 factorial arrangement with fixed effects of hybrid, planting density and their interaction. A single H × PD interaction was observed in lignin (P ≤ 0.01), otherwise only main effects will be discussed. Greater concentration of aNDF (P < 0.01) and NDFD (P < 0.01), but lower starch concentration (P < 0.01) was observed for H1. Additionally, H2 had greater yield of DM (P < 0.01), and milk production estimates per unit of forage (P ≤ 0.03), and hectare (P < 0.01). As PD increased, the concentration of aNDF (P ≤ 0.01) increased as well. Greatest milk estimates (kg of milk/Mg of forage; P value ≤0.01) was observed at D1 and reduced gradually with increasing PD. These results emphasize the effect of hybrid and planting density on yield and nutritional value in whole plant sorghum forage.