Judul: Potensi ekstrak etanol daun kemangi sebagai sediaan antistres untuk ayam petelur
Abstrak: Ayam petelur tergolong mudah tercekam oleh perubahan lingkungan. Penelitian ini dilakukan untuk mengukur respons leukosit ayam petelur terhadap pemberian ekstrak etanol daun kemangi dan membuktikan adanya efek antistres pada kemangi. Sebanyak 16 ekor ayam petelur dibagi menjadi 4 kelompok perlakuan dengan 4 kali ulangan pada setiap kelompok perlakuan. Kelompok perlakuan I ialah kelompok kontrol yang dicekok akuades (K), kelompok perlakuan II, III, dan IV dicekok ekstrak etanol daun kemangi dengan dosis 1 (P1), 2 (P2), dan 3 mg/kg bb (P3). Darah ayam penelitian diambil pada saat ayam berumur 17–20 minggu serta diamati jumlah butir darah putih dan diferensiasi leukositnya. Hasil penelitian menunjukkan bahwa pemberian ekstrak etanol daun kemangi dosis 2 dan 3 mg/kg bb dapat mempertahankan jumlah butir darah putih ayam petelur. Pemberian ekstrak etanol daun kemangi tidak menyebabkan stres pada ayam petelur yang diketahui dari rasio H/L yang mendekati kontrol (K). Flavonoid yang terdapat pada ekstrak etanol daun kemangi berpotensi meningkatkan efek antistres pada ayam petelur.
Keyword: Bogor Agricultural University, Institut Pertanian Bogor, IPB, Ethanolic extract of kemangi leaves, Flavonoid, H/L ratio, Laying hens

Judul: Gambaran Darah Merah Ayam Petelur pada Awal Masa Produksi yang Dicekok dengan Ekstrak Etanol Daun Kemangi
Abstrak: Laying hens are responsive to stress which can cause a decrease in physiological status and production. Empirically, ethanol extract of kemangi leaves can cure various diseases in humans. Uses of ethanol extract of kemangi leaves in animals have not been widely applied. This research was conducted to observe the physiological status of laying hens fed ethanol extract of kemangi leaves. Red blood profile variables observed were red blood cells, hematocrit (PCV), and hemoglobin. Twelve laying hens were divided into 4 groups and each treatment group consisted of 3 chickens as replication. The first treatment group was not given ethanol extract of kemangi leaves as a control(C), the second treatment group was given orally ethanol extract of kemangi leaves with the dose of 1 mg/kg bw(P1), the third treatment group was given orally ethanol extract of kemangi leaves with the dose of 2 mg/kg bw(P2), and the fourth treatment group was given orally ethanol extract of kemangi leaves with the dose of 3 mg/kg bw(P3). The results showed that administration of ethanol extract of kemangi leaves with the dose of 1 mg/kg body weight could improve the physiological status of laying hens during the first week of treatment. Flavonoids, saponins, and tannins contained in ethanol extract of kemangi leaves are possible to improve the physiological condition of laying hens. Meanwhile, ethanol extract of kemangi leaves a dose of 2 mg/kg body weight and 3 mg/kg body weight can decrease red blood parameters in chiken
Keyword: 

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.
Keyword: