Judul: Performa Produksi dan Warna Kuning Telur Puyuh Jepang yang diberi Sorgum Putih dan Tepung Daun Singkong
Abstrak: Sorghum is cheaper and contains high level of energy but less carotenoid compared to maize. Cassava leaves meal is widely known has high level of carotenoid. The combination of these feed stuffs is expected to subtitute maize in ration. A study was carried out to evaluate the effect of sorghum and cassava leaves meal on production performance of japanese quail. A total of 150 laying japanese quail were used in this experiment which is completely randomized designed with 5 ration treatments and 3 replications. Differences between treatment were further analyzed by Duncan Test. The treatments in ration were 50% maize (P1), white sorghum without cassava leaves meal (P2), white sorghum + 1.5% cassava leaves meal (P3), white sorghum + 3% cassava leaves meal (P4), and white sorghum + 4.5% cassava leaves meal (P5). Traits measured were feed intake, egg production, feed conversion, mortality, egg yolk color and economic analysis. The result showed that feed intake and egg production were significantly higher for the ration contains white sorghum. However, the feed conversion and egg weight was not significantly affected. Egg yolk color improved significantly by increasing addition of cassava leaves meal but lowered egg production. In conclusion, white sorghum can substitute maize and cassava leaves meal can be used to increase egg yolk color
Keyword: white sorghum, japanese quail,, cassava leaves meal

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 lokal pada titik tetap non-hiperbolik
Abstrak: Bifurkasi menggambarkan perubahan pada struktur orbit di sekitar titik tetap. Titik tetap dibagi menjadi dua yaitu titik tetap hiperbolik dan titik tetap non-hiperbolik. Titik tetap non-hiperbolik terjadi jika ada nilai eigen dengan bagian real sama dengan nol. Kestabilan dari titik tetap dapat diketahui dari nilai eigen yang diperoleh dari pelinearan medan vektor. Pada bifurkasi satu-dimensi ditemukan kasus-kasus untuk bifurkasi saddle-node, bifurkasi transcritical dan bifurkasi pitchfork. Bifurkasi saddle-node terjadi jika satu sisi dari nilai parameter tidak terdapat titik tetap dan pada sisi lain terdapat dua titik tetap, dimana yang satu stabil dan yang lainnya tak-stabil. Bifurkasi transcritical terjadi jika terdapat pertukaran kestabilan, yaitu dari titik tetap stabil menjadi titik tetap tak-stabil dan sebaliknya. Sedangkan bifurkasi pitchfork dibagi menjadi dua, yaitu: bifurkasi pitchfork supercritical dan bifurkasi pitchfork subcritical. Bifurkasi pitchfork supercritical terjadi jika satu titik tetap stabil berubah menjadi dua titik tetap stabil dan satu titik tetap tak-stabil, dan bifurkasi pitchfork subcritical terjadi jika satu titik tetap stabil dan dua titik tetap tak-stabil berubah menjadi satu titik tetap tak-stabil. Bifurkasi Hopf (bifurkasi dua-dimensi) terjadi jika terdapat orbit periodik pada struktur orbitnya yang berupa lingkaran dengan jari-jari konstan. Ada atau tidaknya orbit periodik dapat diketahui setelah sistem ditransformasikan ke dalam koordinat polar. Orbit periodik ini dapat bersifat stabil maupun tak-stabil. Model periklanan (advertising) Feichtinger merupakan salah satu contoh penerapan bifurkasi Hopf Model ini menghasilkan satu titik tetap dan orbit periodik yang bersifat stabil.
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