Judul: Sorgum Sebagai Pengganti Jagung Dengan Penambahan Tepung Tanaman Paku Air (Azolla Pinnata)Pada Ransum Puyuh Terhadap Mda Dan Kualitas Telur Puyuh
Abstrak: Penelitian ini bertujuan untuk mempelajari pengaruh sorgum dengan penambahan tepung tanaman paku air (Azolla pinnata) sebagai ransum puyuh petelur terhadap kualitas telur dan nilai MDA (Malondialdehyde). Penelitian ini menggunakan 30 ekor puyuh yang berumur 44 hari. Analisis yang digunakan pada penelitian ini adalah analisis deskriptif dengan cara membandingkan antar perlakuan. Perlakuan yang diberikan adalah ransum kontrol jagung (P0), ransum perlakuan sorgum (P1), ransum perlakuan sorgum + 1% tepung Azolla pinnata (P2), ransum perlakuan sorgum + 2% tepung Azolla pinnata (P3), dan ransum perlakuan sorgum + 3% tepung Azolla pinnata (P4). Peubah yang diamati adalah performa, kualitas telur (bobot telur, bobot kuning telur, bobot putih telur, bobot kerabang, tebal kerabang, skor kuning telur, dan Haugh Unit) dan kadar nilai MDA dalam kuning telur. Hasil yang didapatkan menunjukkan bahwa penggunaan sorgum dengan penambahan tepung Azolla dapat menyeimbangkan kandungan karetenoid yang terindikasi dalam skor warna kuning telur, tidak mengganggu performa puyuh, dan adanya aktivitas antioksidan yang dihasilkan oleh tepung Azolla (beta-karoten) pada telur puyuh.
Keyword: Azolla pinnata, kualitas telur, MDA (malondialdehyde), sorgum

Judul: Substitusi Jagung dengan Sorgum yang Ditambahkan Tepung Daun Singkong terhadap Kualitas Telur Puyuh
Abstrak: Sorgum is an energy sources which is highly potential to develop. It has low carotene level, so it has to be balanced by adding carotene in the feed meal. Cassava leaf meal is a kind of forages which has high carotene level 154mg kg-1. This research aimed to study the effect of White Sorgum as corn subtitution with cassava leaves meal combination on the quality and vitamin A of Japanese Quail Egg. This observations used completely randomized design with five treatment and three repetition (10 eggs/repetition). The treatments are control (P1), 50% sorgum + cassava leaves meal 0% (P2), 50% sorgum + cassava leaves meal 1.5% (P3), 50% sorgum + cassava leaves meal 3% (P4), 50% sorgum + cassava leaves meal 4.5% (P5). It is concluded that sorgum and cassava leafs meal were able to increase egg weight, yolk color, albumin weight, haugh unit, and vitamin A level.
Keyword: vitamin A, quail egg, sorgum, egg quality, cassava leaves meal

Judul: Bifurkasi Hopf pada Model Siklus Bisnis Kaldor Kalecki tanpa dan dengan Waktu Tunda
Abstrak: Business cycle model is one of dynamical system models in economic. One of the business cycles model is Kaldor-Kalecki model. Kaldor-Kalecki business cycle model that is written in delayed defferential equations, is a business cycle model that involves gross product and capital stock of a company. In this paper Kaldor-Kalecki business cycle model is analyzed using both nondelay and delay in time of capital stock. By Taylor expansion for the time delayed model, an analysis of stability around the fixed points has been done. Furthermore, by using Hopf bifurcation theorem, it can be shown that there exists periodic orbits and limit cycle. In the nondelayed model, changing the parameter of goods market could lead to the occurrence of Hopf bifurcation and the existence of limit cycle. Similarly, for the delayed model, it has been shown that changing the time delay parameter may result in the occurrence of Hopf bifurcation and limit cycle.
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