Abstract: Background and Objective: The utilization of by-products of palm oil industry consists of palm kernel cake (PKC), palm oil sludge (POS) as feed is limited duo to their high lignin content. Probiotics are able to create a balance of microbes in the digestive tract thus creating optimum conditions for digestion of fibrous feed and improving feed conversion efficiency, which in turn can increase the production of livestock. The objective of this research was to determine the level of replacement concentrate ration of Etawa Crossbred dairy goat (ECDG) with concentrates formulated by various of by product of palm oil industry (palm kernel cake (PKC) and palm oil sludge (POS)) that have supplemented with probiotics. Materials and Methods: Research was conducted using completely randomized design (CRD) with 5 treatments concentrate ration replacement and 4 replications (Treatment A: about 100% concentrate standard (CS) and 0% concentrate of by products of palm oil industry (CBPO), B: 75% CS+25% CBPO, C: 50% CS+50% CBPO, D: 25% CS+75% CBPO and Treatment E). 0% CS+100% CBPO. Parameters measured were quality of milk, ie protein, fat, solid non fat (SNF), density and mineral (Ca and P). Results: The results showed that protein, fat, SNF, density and mineral (Ca and P) was not significant (p>0.05). Conclusion: From the overall parameters it can be concluded that the use of a byproduct of palm oil industry until 100% for ECDG ration does not affect the quality of milk in terms of protein, fat, minerals and density of milk.