Abstract: Eight Holstein steers (458±14 kg) with cannulas in rumen and proximal duodenum were used in a crossover design experiment to determine the feeding value of air Dried Rminal Contents (DRC). Treatments consisted of a steam-flaked corn-based growing diet containing (DMB) 30% of either Alfalfa hay (ALF) or DRC. The ALF contained 93.4% DM, 17.1% CP, 36.7% ADF, 1.0% EE and 7.3% ash. The DRC contained 92.8% DM, 12.5% CP, 44.3% ADF, 3.8% EE and 5.9% ash. Ruminal contents were obtained at a local cattle slaughtering facility. The material was first conveyed over a screen to separate liquids and solids. Solids were then spread over a concrete surface and allowed to air-dry. Dry matter intake was restricted to 9.6 kg head-1. Substituting DRC for ALF in the diet decreased ruminal digestion of OM 18% (p<0.01) and ADF (46.3%, p<0.01), postruminal digestion of OM (17.7%, p<0.01), total tract digestion of OM (15.4%, p<0.01), ADF (32.3%, p<0.01), N (12.0%, p<0.01) and DE, Mcal kg-1 (11.5%, p<0.01). Substituting DRC for ALF in the diet increased (p<0.01) ruminal microbial efficiency (24.2%, p<0.01) and ruminal N efficiency (19.8%, p<0.01). The estimated DE value of DRC was 1.21 Mcal kg-1, approximately 51% of medium-quality alfalfa hay.