This research has been conducted in Naikoten 1, Kota Raja, Kupang city or 3 months. The purpose of this research was to investigate the performance of growth and heritability value from mating group between Local rooster and Isa Brown laying hen. The method used in this research is experimental method. The experimental design used was Complete Randomized Design (CRD) of three treatments in the form of three types of rooster and three replications. The treatment is Saras = Sabu >< Isa Brown, Bakoras = Bangkok >< Isa Brown, Leguras = Leher Gundul >< Isa Brown. The variables measured are hatching weight, body weight, body weight gain, feed consumption, feed conversion, carcass weight, abdominal fat percentage and heritability value of the parameter. The results indicated that the average of cross breed showed excellent growth performance and there is an indication of heterosis effect. The highest heritability value found at carcass weight parameter and hatch weight parameter. Based on the result, it could be concluded that the best growth performance is cross with Bangkok rooster. ABSTRAKPenelitian ini telah dilaksanakan di Kelurahan Naikoten I, Kecamatan Kota Raja, Kota Kupang selama 3 (tiga) bulan. Penelitian ini bertujuan untuk mengetahui performa pertumbuhan dan besarnya nilai heritabilitas dari kelompok ayam hasil persilangan, antara ayam pejantan lokal dan ayam betina ras petelur jenis Isa Brown. Metode percobaan eksperimental merupakan metode yang digunakan dalam penelitian ini. Penelitian ini menggunakan Rancangan Acak Lengkap (RAL) terdiri dari tiga perlakuan yang berupa tiga jenis ayam jantan dan tiga ulangan. Perlakuan yang dimaksud adalah Saras = Sabu >< Isa Brown, Bakoras = Bangkok >< Isa Brown, Leguras = Leher Gundul >< Isa Brown. Variabel yang diukur antara bobot tetas, bobot badan, pertambahan bobot badan, konsumsi ransum, konversi ransum, bobot karkas, persentase lemak abdominal dan nilai heritabilitas dari parameter tersebut. Hasil penelitian menunjukkan bahwa rata-rata ayam hasil persilangan menunjukkan performa pertumbuhan yang sangat baik dan ada indikasi terjadinya efek heterosis. Nilai heritabilitas tertinggi terdapat pada parameter bobot karkas dan bobot tetas. Berdasarkan hasil penelitian disimpulkan bahwa performa pertumbuhan terbaik terdapat pada kelompok persilangan dengan pejantan Bangkok.Kata kunci: Persilangan, performa pertumbuhan, heritabilitas.
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