Eighteen lactating buffaloes at the second lactation were used to evaluate the effect of feeding rations contairihg raw or heated soyabean seeds oh produclive and reproductive performance of buffaloes a‘. early lactation, The buffaloes were assigned to three Similar groups (six animals each). The buffaloes were fed ration containing similar ingredients with the same proportions of concentrate feed mixture, berseem, yellow corn and rice strawt The control group received a ration containing no supplementary soyabean the second group received rattoh containing raw soyabean seeds (R38) and the third group received ration containing heated soyabean seed (HSB) The total mixed rations With added soyabean seeds (888) had higher content of ethe extract {EE} and crud protein (OP); however, nitrogen free extract (NFEl ard fatty acid (FA'sji were lower compared With the control ration The magnitude of changes in body weight during the experimental period was greater in group had rations containing either raw soyabean or treated soyabean than control group Both R58 and H88 rations cause improvement of rumen parameters Feed ration containing soyabean seeds improved circulating progesterone (Pt). cortisol and prostaglandin (PG Ed) in blood These hormones caused safety parturition Added soyabean seeds resulted in significantly (Pd) 05:; high of fat corrected rnilw. tFCiJ: Milk fat percentage and yield, protein percentage and yield and total solids and yield were higher With added soyabean seeds (888) to buffaloes rations. Added R88 or HSB improved the reproductive performance of lactating buffaloes Number of service per conception and days open were reduced Eating behavior ciear'y showed that supplemented (583) had Significant (Pd: 05) effect or diurnal behavior activity of total eating time and decrease ruminating time The total eating time and ruminating period itKg DM intake expressed the greatest wher the buffaloes fed H88 followed by R88 Ration containing both raw or heated caused improvement of sexual behavior and a good sings of estrus than control groups T'ie hormone pattern lcortsol and PG F;Cti of treated groups was higher than that of control groups This profile eased management at parturition and placenta fall-down As results of feed 888 to early lactating buffalos. fed conversion and economical cost were improved The cost of productng 10 Kg milk was reduced, reproductive traits were improved Finally, fed R88 and H88 improved both the production and reproduction performance of lactating buffaloes at early lactation, it is recommended to use R88 or HSB as sources of fat and energy in early lactation of lactating buffaloes to reduce loss of body weight and the negative effect of adding natural fat to the rations, Abbreviations: RSB' Row soyabean - HSB: Heated soyabean - SNF solids not ‘at - TS, Total solids — DMD: Dry matter degradability -TPN‘ True protein nitrogen DO: Days open. 888‘ soyabean seeds (either heated or raw)