Judul: Evaluation of Vitamin D3 Supplementation in Diet on Quail (Coturnix coturnix japonica) Production Performance
Abstrak: Penurunan performa produksi pada puyuh akan berdampak secara ekonomis pada peternak. Rekayasa nutrisi pakan menggunakan vitamin D3 merupakan salah satu solusi yang dapat dilakukan untuk mengatasi masalah tersebut. Penelitian ini bertujuan mengevaluasi suplementasi vitamin D3 dalam ransum terhadap performa produksi puyuh. Ternak sebanyak 450 ekor dipelihara dari umur 22-27 minggu. Penelitian ini menggunakan Rancangan Acak Lengkap (RAL) dengan 3 perlakuan dan 5 ulangan, setiap ulangan menggunakan 30 ekor puyuh. Perlakuan terdiri atas P0 = ransum kontrol, P1 = ransum kontrol + vitamin D3 1,0 g kg-1 ransum, dan P2 = ransum kontrol + vitamin D3 1,5 g kg-1 ransum. Peubah yang diamati yaitu konsumsi pakan, quail day production (QDP), bobot telur, produksi massa telur, efisiensi pakan, mortalitas, dan income over feed cost (IOFC). Data dianalisis dengan sidik ragam (ANOVA) dan uji lanjut Duncan menggunakan SPSS 25 untuk hasil yang berpengaruh nyata. Hasil penelitian menunjukkan suplementasi vitamin D3 dengan dosis 1,5 g kg-1 ransum berpengaruh nyata (P<0,05) meningkatkan QDP, produksi massa telur, dan efisiensi pakan. Dapat disimpulkan bahwa vitamin D3 pada dosis 1,5 g kg-1 ransum dapat meningkatkan performa produksi puyuh., A decrease in laying quail performance will have an economic impact to the farmers. Modification in feed nutrition using vitamin D3 is one of the solution that can be done to overcome this problem. This study aimed to evaluate the supplementation of vitamin D3 in diet on quail production performance. A total of 450 quails were kept from age 22-27 weeks. This study used a Completely Randomized Design (CRD) with 3 treatments and 5 replications, each replication used 30 quails. The treatment diets consisted of P0 = control diet, P1 = control diet + vitamin D3 1.0 g kg-1 diet, and P2 = control diet + vitamin D3 1.5 g kg-1 diet. The variables observed were feed consumption, quail day production (QDP), egg weight, egg mass, feed efficiency, mortality and income over feed cost (IOFC). Data were analyzed using ANOVA and treatment that differed significantly were further tested with Duncan’s Test using SPSS 25 software. The results showed that the supplementation of vitamin D3 with dose 1.5 g kg-1 diet significantly (P<0.05) increased QDP, egg mass, and feed efficiency. It can be concluded that vitamin D3 at dose 1.5 g kg-1 diet can increase the quail production performance.
Keyword: performa produksi, puyuh, Vitamin D3

Judul: Evaluasi Suplementasi Vitamin D3 dalam Pakan terhadap Performa Ayam Petelur Lohmann Brown Umur 91-94 Minggu
Abstrak: Penelitian ini bertujuan mengevaluasi pengaruh suplementasi Vitamin D3-500 produksi Nutricell dalam pakan terhadap performa ayam petelur pada umur 91-94 minggu dengan menggunakan 108 ekor ayam petelur strain Lohmann Brown dengan rataan bobot badan berkisar 1,801-1,840 gram ekor^-1. Penelitian ini menggunakan Rancangan Acak Lengkap (RAL) yang terdiri dari 3 perlakuan dan 4 ulangan, setiap ulangan menggunakan 36 ekor ayam dan perlakuan yang digunakan pada penelitian ini adalah: P0= pakan kontrol (tanpa suplementasi Vitamin D3); P1= pakan kontrol + suplementasi Vitamin D3 1,0 gram kg^-1; P2= pakan kontrol + suplementasi Vitamin D3 1,5 gram kg^-1. Peubah yang diukur meliputi konsumsi pakan, hen day production, massa telur, konversi pakan, berat telur, konsumsi Ca dan P, mortalitas, serta Income Over Feed Cost (IOFC). Data dianalisis menggunakan ANOVA (Analysis of Variance). Hasil penelitian menunjukkan bahwa suplementasi Vitamin D3-500 tidak berpengaruh nyata (P>0,05) terhadap keseluruhan peubah yang diukur, namun masih sesuai dengan standar Lohmann Brown umur 91-94 minggu. Kesimpulan pada penelitian ini adalah suplementasi Vitamin D3-500 pada pakan dengan dosis 1,0-1,5 gram kg^-1 tidak berpengaruh pada konsumsi pakan, konversi pakan, hen day production, massa telur, dan berat telur karena tercukupinya Ca dan P dalam pakan kontrol. Nilai IOFC tertinggi yaitu pada perlakuan tanpa suplementasi Vitamin D3., This study aimed to evaluate the effects of Vitamin D3-500 supplementation produced by Nutricell in feed on the performance of laying hens at 91-94 weeks, using 108 Lohmann Brown laying hens with an average body weight 1.801-1.840 grams hens^-1. The study used a Completely Randomized Design (CRD) consisting of 3 treatments and 4 replications, with each replication involving 36 hens. The treatments: P0=control feed (without Vitamin D3 supplementation); P1= control feed + Vitamin D3 supplementation 1.0 gram kg^-1; P2= control feed + Vitamin D3 supplementation 1.5 gram kg^-1. Parameters measured feed consumption, hen day production, egg mass, feed conversion ratio, egg weight, Ca and P consumption, mortality, and Income Over Feed Cost (IOFC). Data were analyzed using Analysis of Variance (ANOVA). The results, supplementation Vitamin D3-500 had not significant effect (P>0.05) on the variables studied, but still met the standards. In conclusion, supplementation of Vitamin D3-500 in feed at dosages of 1.0-1.5 gram kg^-1 did not affect feed consumption, feed conversion ratio, hen day production, egg mass, or egg weight due to sufficient Ca and P in the control feed. IOFC without Vitamin D3 supplementation had a higher profit value.
Keyword: Performance, IOFC, Laying hens, Vitamin D3

Judul: Hamiltonian formulation for linear waves motion in two layers fluid
Abstrak: The surface wave could be considered as a wave that separates two fluids, namely water and air. Based on this assumption, it is introduced the interfacial wave, a wave between two layers of fluid with different density. The formulation of interfacial waves motion begins with deriving the base equation of irrotational ideal fluid. Furthermore, according to irrotational fluid assumption, the base equation can be stated in velocity potential. In this derivation, the fluids domain is assumed to be restricted by rigid lid boundary conditions, both at the upper and lower limit. Therefore, the interfacial waves motion can be explained in a hamiltonian formulation. In the hamiltonian formulation, total energy is defined as the sum of kinetic and potential energy. The hamiltonian system is obtained from reduction of kinetic energy by using the Dirichlet Neumann Operator. The resulted kinetic energy equation is nonlinear. Therefore, this form is linearized by first part of the Taylor expansion. This linearization gives a dispersion relation of linear wave. Based on this dispersion relation, the phase speed of the linear wave depends on the density ratio of the two layers fluid.
Keyword: