The research was aimed to evaluate the quality chilled semen of cross bred goat (Nubian and Ettawa) which diluted with skim milk and yolk citrate extender in different storage time.. An artivicial vagina was used to collect semen from three mature bucks, after that fresh semen was evaluated. Semen was devided into 5 part and diluted wih 5 combination of extenders (P1 = 100% yolk citrate), (P2 = 75% yolk citrate + 25 % skim milk), (P3 = 50% yolk citrate + 50% skim milk ), (P4 = 25% yolk citrate + 75% skim milk ) and (P5 = 100% skim milk), the extended semen was stored for 3,6,9 and 12 days at 4-7 0 C. Paramaters measured were pH, sperm motility, live sperm percentage and sperm abnormality percentage. Data were analyzed using SPSS software program. The result showed that 75% yolk citrate + 25 % skim milk extender could maintain the chilled semen quality at 4-7 0 C until 3 days with 72,79% live spermatozoa, 2,3 ± 0,58 mass motility, 2,67 ± 0,58 individual motility and 11,49% abnormal percentage.Key words: Extender, milk skim, yolk citrate, Nubian x PE goat ABSTRAK Penelitian ini bertujuan untuk mengevaluasi pengaruh pengencer susu skim dengan sitrat kuning telur dan lama penyimpanan terhadap kualitas semen kambing persilangan Nubian dengan Peranakan Ettawa. Semen ditampung dengan menggunakan vagina buatan dari 3 kambing jantan, setelah ditampung semen segar dievaluasi kemudian diencerkan dengan 5 kombinasi pengencer (P1 = 100% sitrat kuning telur), (P2 = 75% sitrat kuning telur + 25% susu skim), (P3 = 50% sitrat kuning telur + 50% susu skim), (P4 = 25% sitrat kuning telur + 75% susu skim) dan (P5 = 100% susu skim), semen disimpan selama 3, 6, 9 dan 12 hari pada suhu 4-7 0 C. Kualitas semen (pH, motilitas spermatozoa, persentase spermatozoa hidup, dan persentase abnormalitas spermatozoa) dihitung setiap 3, 6, 9 dan 12 hari. Hasil penelitian menunjukkan bahwa pengencer terbaik terdapat pada kombinasi pengencer P2 (75% sitrat kuning telur + 25% susu skim) pada penyimpanan 3 hari dengan persentase hidup 72,79%, motilitas massa 2,3 ± 0,58, motilitas individu 2,67 ± 0,58 dan persentase abnormalitas 11,4 %.Kata kunci : Pengencer, susu skim, sitrat kuning telur, kambing Nubian x PE.