Indeks sinkronisasi pelepasan N-protein dan energy dalam rumen sebagai sebagai basis formulasi ransum ternak ruminansia dengan bahan lokal

Abstract

Berdasarkan asumsi para ahli dari negara subtropis bahwa nisbah yang optimal sinkronisasi degradasi protein dan bahan organik (BO) sebesar 25 g N/kg BO terfermentasi dalam rumen akan dihasilkan efisiensi sintesis N mikroba rumen, atau dikategorikan mempunyai nilai indeks sinkronisasi 1. Perbedaan jenis dan komposisi kimia bahan pakan dengan di Indonesia dan di daerah tropis lainnya diduga akan berbeda pula tingkat dan laju degradasi protein dan BO selanjutnya akan berbeda pula nisbah sinkronisasi kedua nutrien tersebut. Penggunaan indeks sinkronisasi selain kebutuhan energi dan protein dalam memformulasi ransum ternak ruminasia diharapkan akan dihasilkan efisiensi sintesis N mikroba dan produksi ternak yang optimal.

The experiments were conducted to prove the diet formulation technique which was based on the synchronization of releasing N-protein and energy in addition to energy and protein requrement in diet for efficiency of rumen microbial N synthesis and animal production. Exp. 1. Nylon bag technique was adopted to determine ruminal characteristic of protein and organic matter (OM) degradation of feedstuffs (forage and concentrate diet) for which the synchrony index of N-protein and OM fermented in the rumen might be determined based on synchronization ratio of 20 (I20), 25 (I25), and 30 g N/kg OM (I30) fermented in the rumen. Exp. 2. By using randomized block design, twelve local cattle were arranged into four groups according to average body weight of the animals. Each group was fed three types of diet that was different in synchronization ratio of supplying N-protein and fermented OM in rumen, namely 20 g N/kg OM (R20); 25 g N /kg OM (R25); and 30 g N /kg MO (R30). The diets had iso-energy and iso-protein contents and had the same synchrony index. Exp 3. By using randomized block design with a factorial of 3 x 2. The first factor was three diferent protein levels i.e. 10, 12, and 14 %; the second factor was two deferent levels of TDN (total digestible nutrients) (65 and 70 %). Eighteen local cattles were arranged into three groups according to average body weight of the animals. Each group was fed six types of diet that was different in level of CP or TDN. The diets had the same synchrony index, namely 0,560.