<![CDATA[The purpose of this research was to find the resistibility of Manalagi apple peel extract, using etanol, to the growth of was to determine the antibacterial activity of Manalagi apple peel (Malus sylvestris Mill) extract in various solvent using ethanol concentration against the growth of Streptococcus agalactiae and Escherichia coli bacteria that causing mastitis.The research methodwas experimental using Completely Randomized Design with 4 treatments and 6 replication. The treatments consisted of P1 (10%), P2 (20%), P3 (50%) concentrations and P0 (10%) iodips as the control. The variable measured was diameter of inhibition zone. The data were analyzed using ANOVA and continued by Duncan’s New Multiple Range Test (DMRT) test if there was significantly difference result. The result of the inhibition zone of Manalagi apple peel extract using etanol in preventing the growth of Streptococcus agalactiae and Escherichia coli bacteria was different (P<0,01). In P2 (30%) concentration, the extract resistibility to the growth of Streptococcus agalactiae bacteria was equivalent to P0 (iodips) and in P3 (50%) concentration, the extract resistibility to Escherichia coli bacteria was greater than P0 (iodips). Manalagi apple peel extract using etanol can be used as a natural antiseptic solution for teat dipping on dairy cows. The recommendation from the research was using extract Manalagi apple peel with etanol solvent concentration of 30% as a solution of teat dipping. Keywords : Manalagi apple peel, Teat dipping, Mastitis, Streptococcus agalactiaeand Escherichia coli]]>
