J I T A A Journal of the Indonesian Tropical Animal Agriculture Accredited by Ditjen Penguatan Risbang No. 60/E/KPT/2016 J. Indonesian Trop. Anim. Agric. pISSN 2087-8273 eISSN 2460-6278 http://ejournal.undip.ac.id/index.php/jitaa 46(2):106-113, June 2021 DOI: 10.14710/jitaa.46.2.106-113 Comparison of the favorable gain values of genetic improvement among Indonesian grade cow breeds selected for agrotechnopark intensification U. Paputungan, M. J. Hendrik and S. E. Siswosubroto Faculty of Animal Science, Sam Ratulangi University, Manado 95115, Indonesia Corresponding E-mail: umarpaputungan@unsrat.ac.id Received November 02, 2020; Accepted May 21, 2021 ABSTRAK Penelitian ini bertujuan membandingkan batas terkecil dan terbesar titik pangkas seleksi proporsi untuk menilai pertambahan bobot badan yang menguntungkan dalam peningkatan genetik bangsa sapi local Indonesia yang dipilih pada intensifikasi Agrotechnopark (sistem pertanian siklus-bio terpadu). Bobot hidup ternak dikoleksi dari 674 induk bangsa-bangsa sapi lokal dewasa yang dipelihara peternak di Sulawesi Utara. Data induk dikoreksi dengan penyesuaian ternak umur enam tahun. Semua induk dibagi kedalam tiga kelompok bangsa yang berbeda komposisi genetik dari generasi perbaikan bangsa Bali (BG) berjumlah 207 induk, generasi perbaikan bangsa Ongole (OG) berjumlah 189 induk, dan persilangan bangsa sapi lokal (LG) berjumlah 178 induk. Perbaikan genetik induk sapi BG, OG dan LG dianalisis dengan melibatkan intensitas seleksi ( i), ketepatan seleksi (r), dan standar deviasi ( SD) bobot hidup kelompok bangsa sapi lokal yang diseleksi. Hasil kajian menunjukkan bahwa komponen kritis adalah peningkatan genetik bangsa sapi lokal melalui pemilihan proporasi terkecil dari titik batasan pangkas 10% untuk persiapan intensifikasi Agrotechnopark dari induk unggul yang terseleksi antara kelompok populasi bangsa sapi BG, OG dan LG dengan kenaikan positif sifat bobot hidup induk sesuai urutan masing-masing ketiga bangsa sapi tersebut sebesar 58,6 kg, 23,15 kg, dan 28,62 kg per generasi dibandingakan dengan batasan proporsi titik pangkas 20% dan 30%. Kata Kunci: bangsa sapi lokal Indonesia, intensifikasi agrotechnopark, peningkatan genetik. ABSTRACT This research was aimed to compare the small and big truncation point proportions intended to evaluate gain values of genetic improvement for Indonesian Local cow breed groups selected for Agrotechnopark (integrated bio-cycle farming system) intensification. Animal live weights were collected from 674 Indonesian grade breed cows kept by local household farmers in North Sulawesi province. Data of cows were corrected by adjusting to six years old ages. All cows were divided into three breed groups with different genetic compositions of Bali breed cow generation (BG) of 207 cows, Ongole grade cow generation (OG) of 189 cows, and Local grade cow generation (LG) of 178 cows. The genetic improvements of BG, OG and LG were analyzed involving selection intensity (i), accuracy of selection (r), and standard deviation ( SD) of breed group traits under selection. Results of this study showed that the critical components was genetic development of local grade breeds by choosing small proportion of 10% truncation point for Agrotechnopark intensification of selected elite cows groups among BG, OG and LG populations with the positive live weight gains of 58.6 kg, 23.15 kg, and 28.62 kg per generation, respectively compared with larger percentages of 20% and 30% proportions of truncation Agrotechnopark is integrated bio-cycle farming system (Paputungan et al.) 106