This study was investigated fermentation characteristics in the rumen for the purpose to utilize cage layer manure (CLM). Sorghum was ensiled with 30%r CLM(sorghum-manure silage, based on dry matter of sorghum) and without CLM(sorghum silage), and the fistulated four Corriedale rams(average weight of about 40.6 ㎏; ♂) were used to determine the effect in the rumen. Total ruminal VFA in sheep fed CLM silage was significantly(P$lt;0.05) increased compared to that fed sorghum silage, and peaked(11.97 mmol/100㎖) at 2 hours after feeding. Ruminal ammonia nitrogen concentration in sheep fed CLM silage was significantly(P$lt;0.05) higher than that of sheep fed sorghum silage. The average ruminal pH values for sheep was significantly different, but was drastically reduced (P$lt;0.05) at 0.5 hours after feeding, and waa constantly level to 1 hours after feeding. Ruminal lactic acid peaked at 0.5 hours after feeding, and was drastically reduced at 0.5 hours after feeding. Ruminal acetic acid in sheep fed CLM silage was significantly(P$lt;0.05) increased compared to that fed sorghum silage. Ruminal propionic acid concentration was peaked at 2 hours after feeding(P$lt;0.05). However, this acidity of CLM silage(2.25 mmol/100㎖) was maticedly higher(P$lt;0.05) than that of the sorghum silage(1.78 mmol/100㎖). Ruminal butyric acid of sheep fed CLM silage was markedly higher (P$lt;0.05) than that fed sorghum silage.