ABSTRAK. Tujuan penelitian ini adalah mengevaluasi kinerja pertumbuhan sapi persilangan Belgian Blue (BB) dan sapi Peranakan Ongole (PO) pada turunan pertama (F1). Sapi persilangan (BB dan PO) yang digunakan sebanyak 15 ekor terdiri atas jantan 6 ekor dan betina 9 ekor, selain itu digunakan 8 ekor sapi PO betina yang dipelihara di Balai Embrio Ternak (BET) Cipelang Bogor. Peubah yang diamati adalah bobot lahir (BW), bobot sapih (WW) 205 hari, bobot 1 tahun (YW), pertambahan bobot badan harian dari lahir (GBW) sampai sapih (GWW) dan pertambahan bobot badan harian dari sapih (GWW) sampai umur 1 tahun (GYW). Data dianalisis secara deskriptif dan perbedaan antar sapi silangan (BB-PO) dengan sapi PO dilakukan uji t. Hasil analisis bobot badan dan pertumbuhan menunjukkan bahwa, bobot badan sapi silangan BB dan PO lebih tinggi dibandingkan dengan sapi PO pada WW 205 hari (165,2±21,3 kg dan 115±15,2 kg), YW (365 hari) (240,7±28,1 kg dan 194,9±26,1 kg) dan GBW sampai GWW (0,675±0,097 kg dan 0,441±0,059 kg). BW dan GWW sampai GYW tidak berbeda antara sapi silangan BB-PO dengan PO. Hasil penelitian ini menunjukkan bahwa program cross-breeding sapi BB dengan PO dapat meningkatkan kinerja bobot badan dan pertumbuhan.  (Growth performance evaluation of belgian blue and ongole crossbreed) ABSTRACT. The purpose of this study was to evaluate the growth performance of cross-breeding of Belgian Blue (BB) and Ongole Grade (PO) cattle in the first generation (F1). Crossbred of BB and PO cattle used as many as 15 individuals consisting of 6 males and 9 females, also, 8 individual PO females are used which are kept in the Livestock Embryo Center (BET) Cipelang, Bogor. The observed variables were birth weight (BW), weaning weight (WW) 205 days, 1-year weight (YW) 365 days, daily body weight gain from birth (GBW) to weaning (GWW) and daily body weight gain from weaning (GWW) until the age of 1 year (GYW). Data were analyzed descriptively and the difference between cross-breeding (BB-PO) cattle and PO cattle was analyzed by t-test. The results of body weight and growth analysis showed that crossbred BB and PO cattle were higher than PO cattle at WW 205 days (165.2 ± 21.3 kg and 115 ± 15.2 kg), YW (365 days) (240.7 ± 28.1 kg and 194.9 ± 26.1 kg ) and GBW to GWW (0.675 ± 0.097 kg and 0.441 ± 0.059 kg). BW and GWW to GYW do not differ between crossbred BB-PO and PO cattle. The results of this study indicate that the cross-breeding program for BB cattle with PO cattle breeds can improve the performance of body weight and growth.

The purpose of this study was to determine the diversity of qualitative traits in PO, Belgian Blue and PO-Belgian Blue crosses using principal component analysis. The total samples of cattle used were 36 consisting of 8 heads Belgian Blue (4 males and 4 females), 17 heads Belgian PO-Belgian cross-breed (11 males and 6 females) and 11 PO heads (all females)). The diversity of qualitative traits observed were 17 characteristics namely plain body-color (WTP), combination body-color (WTK), horned (MT), humped (MP), sagging (MG), black tail tip color (WUEH), white tail tip color (WUEH), black eyelash color (WBMH), white eyelash color (WBMP), circle hair head (PRK), circle hair back (PRP), circle hair bracket (PRB), black nail color (WKH), nail color white (WKP), double muscle (PG), black muzzle (WMH) and white muzzle (WMP). Qualitative data were analyzed descriptively by calculating the proportion value, while the determinant variables of each breed were analyzed using the principal component analysis method (AKU) with the Minitab version 7 program. The results showed that the characteristics of qualitative traits in PO, Belgian Blue, and PO-Belgian Blue cross-breed cattle have a high diversity. PO and Belgian Blue cattle breeds can be clearly distinguished based on the characteristics of qualitative traits, whereas PO-Belgian Blue crossbred cattle have clusters that are close to PO cattle clusters. Found character traits for each cattle breed in both PO, Belgian Blue, and PO-Belgian Blue cross-breed. There are three characteristics of qualitative traits possessed in each cow nation, namely the variable circle hair head (PRK), circle hair back (PRP) and horned characters (MT). Based on the results obtained that the qualitative traits in cattle can be used as a distinguishing character between PO, Belgian Blue, and PO-Blue Belgian cross cattle breeds.