Judul: . Tingkat Keberhasilan Produksi Embrio Secara In Vitro Menggunakan Semen Beku Sapi Bali (Bos Javanicus) Dan Ongole (Bos Indicus).
Abstrak: Upaya peningkatan produktivitas dan populasi sapi lokal salah satunya adalah produksi embrio metode fertilisasi in vitro, metode ini memanfaatkan oosit ovarium sapi betina dari rumah potong hewan yang difertilisasi menggunakan semen beku sapi bali (Bos javanicus) dan sapi ongole (Bos indicus). Pengamatan dilakukan terhadap pembelahan embrio pada kultur hari ke-2 setelah fertilisasi, kecepatan pembelahan dan jumlah total blastosis yang terbentuk pada kultur hari ke-6, 7, 8, dan 9. Spermatozoa sapi bali lebih baik (p<0.05) dibandingkan sapi ongole dalam memfertilisasi dan mendukung kecepatan pembelahan embrio, serta total blastosis yang terbentuk. Embrio yang membelah pada hari ke-2 dari oosit yang difertilisasi semen sapi bali (39.40%) lebih tinggi dari embrio yang difertilisasi semen sapi ongole (25.22%). Tingkat perkembangan embrio tahap blastosis juga lebih tinggi pada embrio dari oosit yang difertilisasi semen sapi bali (47.05%) dari pada embrio yang berasal dari oosit yang difertilisasi semen sapi ongole (22.09%). Berdasarkan hal tersebut, spermatozoa sapi bali lebih baik digunakan dalam produksi embrio secara in vitro dari pada spermatozoa sapi ongole.
Keyword: produksi embrio in vitro, semen sapi bali, sapi ongole

Judul: Pembentukan Blastosis Pada Embrio Sapi yang Difertilisasi Secara In Vitro dengan Semen Sapi Bali (Bos javanicus) dan Semen Sapi Simmental (Bos taurus)
Abstrak: In vitro fertilization is one of reproductive biotechnology which can be used to increase population, productivity, and quality of cattle in Indonesia. Bali cattle (Bos javanicus) is one of native cattle from Indonesia, which have good carcass, meat production, which has adapted with invironment, and also have good fertility. Development of Bali cattle population can be accived through Embryo Transfer (ET) using IVF embryo production. The aim of this study was to determine the ability of Bali cattle semen (Bos javanicus) and compared with Simmental cattle semen (Bos taurus) to fertilized and its effect on cleavage rate until the blastocyst stage. This study was conducted in May and June 2012 at laboratory IVF production of Balai Embrio Ternak Cipelang, Bogor. Matured oocytes will be fertilized using Bali cattle semen and Simmental cattle semen, which have been capacitated before. Comparisons between bulls for cleavage, morula, and blastocyst rate, were analyzed using Chi-square analysis. The results indicate that Bali cattle can produced higher cleavage rate, morula rate, and blastocyst rate compared with Simmental cattle for in vitro embryo production. Embryo cleavage rate, morula rate and blastocyst rate were significantly different (P>0,05). The competence of embryo development from the blastocyst rate at day 6 was significantly different (P<0,05) but blastocyst rate at day 7, 8, and 9 were not significantly different (P>0,05).
Keyword: 

Judul: Metrik Einstein (Anti-) Self-Dual Berdimensi Empat dengan Metode Cartan
Abstrak: Gravitational field equation can be formulated in differential forms (differential geometry), which describes gravity as a manifestation of the curvature of space-time. Curvature of space-time is characterized by a metric that satisfies the gravitational field equation. With differential forms it can be formulated the (anti-) self-dual Einstein equation, which is a modification of the Cartan structure in (anti-) self-dual basis. Calculation of (anti-) self-dual metric with (anti-) self-dual Einstein equation is simpler than the calculation using Christoffel symbols.
Keyword: