Production performance of male Sumba Ongole, Brahman Cross and Australian Commercial Cross grown in a feedlot system

English. The feedlot (fattening) has been recognized as a method for improving beef cattle production including carcass quality. This experiment was conducted to study the growth rate, carcass and non-carcass production of Sumba Ongole (SO), Brahman Cross (Bx) and Australian Commercial Cross (ACC) cattle grown intensively and slaughtered at different weight. Ninety-six (96) heads of male SO, Bx and ACC beef cattle of approximately slaughtered at the live-weight of I (350-375 kg), II (376-400 kg), III (401-425 kg) and IV (426-450 kg), respectively. All animals were grown in feedlot system with similar diet, namely 85 percent concentrate and 15 percent King grass. The ration and water were given in ad libitum. The data obtained were analyzed by using a covariance analysis and profile analysis. The results indicated that all animal tended had a similar growth rate. The carcass percentage of Bx was higher, and drip percentage was lower than SO and ACC cattle. There were significant differences between cattle breeds on percentage of bone, meat and fat of carcass, and also on yield grade, percentage of retail cut and percentage of non-carcass were differ significantly. The percentage of bone and intestinal tended to decrease by increasing of slaughtered weight

Indonesian. Usaha penggemukan merupakan salah satu cara untuk meningkatkan produksi sapi potong, termasuk kualitas karkas yang dihasilkan. Penelitian ini bertujuan untuk mengetahui laju pertumbuhan, konsumsi pakan, produksi karkas dan non-karkas, serta kualitas karkas dari tiga bangsa sapi potong jantan, yaitu sapi Sumba Ongole (SO), Brahman Cross (Bx) dan Australian Commercial Cross (ACC) yang dipelihara secara intensif pada berbagai bobot potong. Sembilan puluh enam (96) ekor sapi SO, Bx dan ACC jantan umur kurang lebih dua tahun, masing-masing dipotong pada bobot potong I (350-375 kg), II (376-400 kg), III (401-425 kg) dan IV (426-450 kg). Sapi dipelihara secara feedlot (penggemukan) dengan pakan yang sama, yaitu terdiri dari 85 persen konsentrat dan 15 persen rumput Raja (King grass). Pakan dan air minum diberikan secara ad libitum. Data dianalisis dengan menggunakan analisis peragam (kovarians) dan analisis profil. Hasil penelitian menunjukkan bahwa ketiga bangsa sapi cenderung mempunyai laju pertumbuhan yang sama. Sapi Bx mempunyai persentase karkas yang lebih tinggi dan persentase penyusutan karkas yang lebih rendah dari pada sapi SO dan ACC. Persentase tulang, daging dan lemak karkas menunjukkan perbedaan yang nyata di antara bangsa sapi, demikian juga nilai yield grade. Persentase potongan komersial karkas (retail cut) dan komponen non-karkas, juga berbeda di antara bangsa sapi. Persentase tulang dan saluran pencernaan cenderung menurun dengan meningkatnya bobot potong