Judul: Pengaruh Fortifikasi Vitamin E dan Zink dalam Ransum terhadap Performa Ayam Petelur.
Abstrak: Indonesia as a tropical country with high ambient temperature and relatively humidity cause heat stress-related decreases in laying hen performance. Enrichment of antioxidants in the diet can reduce the negative effect of heat stress. The purpose of this study was to determine the effects of fortification vitamin E, zinc organic, and its combination as antioxidants in commercial diets on the performance of ISA-Brown laying hens. This study used 160 laying hens aged 20-25 weeks. The experimental design used in this research was completely randomized design (CRD) with 4 treatments, 4 replications of 10 birds of each. The birds were fed either a control diet (R0) or a control diet fortified with vitamin E 200 ppm (R1), zinc organic 200 ppm (R2), or a combination of vitamin E 200 ppm and zinc organic 200 ppm (R3). The results showed that fortification of vitamin E and zinc organic or its combination increased hen day production, egg mass production and feed conversion. Feed consumption of hens fed with vitamin E and vitamin E plus zinc organic was higher (P<0.05) than that of the control. Egg weight remained similar in all treatments. Combination of fortification dietary vitamin E 200 ppm and zinc organic 200 ppm resulted the best performance of laying hen.
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Judul: Pengaruh Fortifikasi Vitamin E dan Mineral Zn terhadap Umur Pertama Bertelur, Ukuran Shank dan Kualitas Telur Isa Brown
Abstrak: The aim of this research was to determine the effect of fortication vitamin E, Zn, and its combination in commercial the diets on the age of the first egg-laying, shank size, and egg quality of Isa Brown laying hens. This research was arranged in completely randomized design (CRD) with four treatments and four replicates. The parameters observed were shank length, shank diameter, egg weight, albumen weight, and albumen percentage, yolk weight, yolk percentage, shell weight, shell percentage, shell thickness and yolk color score. This research used 160 laying hens aged 20 weeks that reared intensvely until 25 weeks age. Treatment given were R0 = control diet (without vitamin E and Zn fortification), R1 = diet fortified with vitamin E 200 ppm, R2 = diet fortified with Zn 200 ppm, R3 = diet fortified vitamin E 200 ppm + Zn 200 ppm. Result of this research showed that fortification of vitamin E, Zn and its combination significantly increased (P<0.05) shank lenght, but did not affect shank diameter and egg quality. Vitamin E and Zn fortification could increased shank length and earlier age of the first egg-laying and did not affect egg quality and shank diameter.
Keyword: Zn, vitamin E, shank size, egg quality, age of the first egg-laying

Judul: Persamaan Geodesik Black Hole dengan Metrik Kerr 4+1 Dimensi dalam Koordinat Waktu Kosmik
Abstrak: Persamaan geodesik black hole dengan metrik Kerr 4+1 dimensi dalam koordinat waktu kosmik merupakan interpretasi lain dari persamaan geodesik black hole dengan metrik Kerr 4+1 dimensi, dimana acuan waktu yang digunakan diubah dari koordinat waktu wajar (proper time) ke dalam koordinat waktu kosmik (cosmic time). Waktu kosmik merupakan koordinat waktu yang dimana pengamat bergerak mengikuti ekspansi dari alam semesta. Penelitian ini merekonstruksi persamaan geodesik black hole dengan metrik Kerr 4+1 dimensi yang telah ditemukan pada penelitian sebelumnya menjadi persamaan geodesik yang memiliki fungsi terhadap dimensi waktu (t). Hasil akhir dari transformasi persamaan dapat digunakan sebagai bahan studi pustaka untuk penelitian lebih lanjut mengenai persamaan geodesik black hole dalam koordinat waktu kosmik.
Keyword: Dimensi ekstra, Metrik Kerr, Persamaan geodesik, Waktu kosmik