In (his study the eflects of oils and protein coated with Ca soaps on degradation of feeds were investigated using one year old, three female Akkaraman lambs with rumen fistule. Effects ol crude sunflower oil (HV), acidulated oil refined from crude sunflower oil (AY) and protein coated with Ca soaps prepared from these fat sources (PKHY. PKAY) which are at level ol 8 % in concentrate feed were determined on degradation of wheat straw, barley, and soybean meal in rumen. Dry matter degradation of soybean meal at the periods of incubation 2, 4 and 24 hours was not significant among groups (P>0.05); however, the degradation with 8 hours period was found 47.10, 52.21, 53,78, 55.77, 51.91% respectively in control, HY, PKHY, AY, PKAY groups (P<0.05). The degradation of barley was found lower in control group than other groups at 2 hours incubation (P<0.05). The degradation level with 8 hours incubation was determined 71.32, 78.39, 75.65, 77.42, 78.97 % respectively There were important differences between control group and the other groups, and the differences between PKAY and PKHY groups were significant (P<0 05). It was determined that the degradation level of straw was very high particularly during 48 hours in AY and HY groups including free fat; however, there were statically no differences among groups in three incubation periods (P>0.05). As a result, both crude and Ca treated oil fractions improved ruminal dry matter degradation of barley and SBM and did not effect wheat straw.