Judul: Free Range System Maintenance Evaluation of Inside  Organs and Digestive Tract of Chicken IPB-D1.
Abstrak: Pemeliharaan menjadi salah satu faktor keberhasilan suatu usaha ternak unggas. Umumnya pemeliharaan dilakukan secara intensif namun menyebabkan ayam hidup dalam kondisi stres dan tidak sejahtera. Upaya yang dilakukan untuk meminimalisir dampak negatif tersebut dengan menerapkan pemeliharaan sistem free range. Penelitian ini bertujuan mengevaluasi pengaruh pemeliharaan sistem free range terhadap kondisi organ dalam dan saluran pencernaan pada ayam IPBD1 umur 11 minggu di Sinar Harapan Farm. Sampel yang digunakan sebanyak 20 dari 110 ekor ayam IPB-D1 yang diambil secara purposive sampling. Data penelitian dianalisis secara deskriptif dengan menyajikan rata-rata (x̅) dan standar deviasi (sd). Hasil penelitian menunjukkan bahwa bobot organ dalam dan saluran pencernaan ayam IPB-D1 yang dipelihara secara free range lebih berat dibandingkan ayam IPB-D2 yang dipelihara intensif. Kesimpulan penelitian ini bahwa sistem free range meningkatkan konsumsi serat kasar dari hijauan yang berdampak pada berat organ dalam menjadi lebih besar., The rearing system is one of the success factors in the poultry farming business. In general, chickens are carried out intensively which causes the chickens to live under stressful conditions and leads to unwelfare poultry. Efforts made to minimize these negative impacts can be done with a free-range maintenance system. This study aims to evaluate the effect of rearing using the free range system on internal organs and digestive tract conditions of IPB-D1 chickens at 11 weeks of age at Sinar Harapan Farm. The sample used in this study was 20 IPB-D1 chickens taken by purposive sampling from 110 IPB-D1 chickens. The research data were analyzed descriptively by presenting the average (x̅) and standard deviation (sd). The results showed that free-range maintenance affected the internal organs and digestive tract of IPB-D1 chickens. Internal organ weights and digestive tract of IPB-D1 chickens reared in a free range showed heavier compared to those of IPB-D2 chickens. This study concludes that free range increases the consumption of crude fiber from forages which has an impact on the weight of the internal organs becoming larger.
Keyword: ayam IPB-D1, free range, organ dalam, saluran pencernaan, serat kasar

Judul: Evaluation of Free Range System on Performance and Income Over Feed Cost of IPB-D1 Chicken
Abstrak: Ayam IPB-D1 merupakan rumpun baru ayam lokal komposit yang memiliki keunggulan memiliki adaptasi yang baik terhadap sistem free range. Penelitian ini bertujuan mengevaluasi pengaruh pemeliharaan dengan sistem free range terhadap performa dan income over feed cost (IOFC) ayam IPB-D1. Penelitian ini dilaksanakan pada bulan September sampai bulan November 2022. Jumlah populasi yang digunakan pada penelitian ini sebanyak 110 ekor ayam IPB-D1 dengan umur berbeda. Data penelitian yang didapatkan dianalisis secara deskriptif dengan menyajikan rataan dan standar deviasi (sd). Hasil penelitian menunjukan bahwa ayam IPB-D1 yang dipelihara secara free range memiliki angka konsumsi ransum sebesar 361,67 gram, bobot badan akhir sebesar 668,22 gram pada kelompok A, 460,14 gram pada kelompok B, dan 360,18 gram pada kelompok C, konversi pakan sebesar 6,16 pada kelompok A, 8,69 pada kelompok B, dan 12,71 pada kelompok C dan nilai mortalitas sebesar 1,33% pada kelompok A, 8,70 pada kelompok B, dan 16,67 pada kelompok C. IOFC yang dihasilkan sebesar Rp. 21.632,61. Kesimpulan penelitian ini menunjukkan bahwa ayam IPB-D1 tidak memiliki performa yang optimal, namun menghasilkan IOFC yang baik., IPB-D1 chickens are a new family of composite local chickens which have the advantage is have good adaptation to the free range system. This study aimed to evaluate the effect of rearing using the free range system on the performance and income over feed cost (IOFC) of IPB-D1 chickens. This study was conducted from September to November 2022. The total population used in this study was 110 IPBD1 chickens with different ages. The research data obtained was analyzed descriptively by presenting the mean and standard deviation (SD). The results showed that IPB-D1 chickens reared in free range had a feed consumption of 361.67 grams, a final body weight of 668.22 grams in group A, 460.14 grams in group B, and 360.18 grams in group C, feed conversion was 6.16 in group A, 8.69 in group B, and 12.71 in group C and a mortality rate of 1.33% in group A, 8.70 in group B, and 16.67 in group C. The result of IOFC is Rp. 21.632.61. The conclusion of this study showed that IPB-D1 chickens do not have optimal performance, but produce good IOFC.
Keyword: free range system, IPB-D1 chicken, performance

Judul: Pembuatan Film Tipis Cu2ZnSnS4 sebagai Lapisan Penyerap Cahaya pada Sel Surya Menggunakan Metode Elektrodeposisi
Abstrak: Thin film of Cu2ZnSnS4 (CZTS) is an alternative semiconductor used as light absorber layer on solar cell. CZTS can replace silicon that commonly used as commercial semiconductor. The advantage of using CZTS as absorber layer is due to the abundance of its chemical composer on earth, and its high value of absorption coefficient. The absorber layer was made by using electrodeposition method on ITO glass substrates. The films were deposited at room temperature using potentiostatic mode with a potential of –1.05 V for 30, 45, and 60 minutes. After that, the films were annealed at two different temperatures, 180 ºC and 500 °C, for 45 minutes in N2/H2S atmosphere. Based on X-ray diffraction analysis, the polycrystalline thin film obtained fall into kesterite crystal phase. This type of crystal was obtained when the CZTS was annealed at 500 °C in H2S/N2 atmosphere. The value of optical band gap energy for the CZTS thin film was 2.2 eV with the film thickness about 1.228–6.366 μm. The sample of CZTS with electrodeposition time of 45 minutes and annealing temperature of 500 °C showed the best result and in conformity with absorber layers criteria for solar cells.
Keyword: semiconductor, ITO glass, CZTS thin film, electrodeposition