Judul: Postpartum estrus of Sumatra x St. Croix x Barbados Blackbelly and Sumatra x Barbados Blackbelly Cross Bred Sheep.
Abstrak: Sheep are mainly raised in rural society because of their biological characteristic which support optimum production such as ability to reproduce throughout the year, short pregnancy period (150 days) and high litters. Postpartum estrus period is one of factors influenzing lambing interval beside pregnancy and breeding management. This research was conducted from October 9, 1999 -March 7, 2000 at Research Institute for Animal Production Experiment Station, West Cilebut, kecamatan Sukaraja, Bogor. Twenty four cross bred of Sumatra x Barbados Blackbelly (BC) sheep and 42 cross bred of Sumatra x St. Croix x Barbados Blackbelly sheep (M) were used for the study. Observed Variables were the period of postpartum estrus and other information like ewes age, live weight of ewes at lambing and estrus, litter size, total birth weight, and total feed consumption of ewes. Data were analyzed by General Linear Model according to SAS 1986.
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Judul: Production performance of prolific Javanese sheep
Abstrak: The production performance of 425 Javanese ewes based on 1143 records produced at the Cicadas sheep Research Station of the Research Institute of Animal Production, Bogor, Indonesia, was evaluated in this study. Although the focus was on the effect of prolificacy and some major environmental causes of variation on lamb survival and ewe output at weaning, the analysis included other traits such as litter size, age at first lambing and lambing interval. Results concerning variation of litter size were consistent with previous studies and with a major gene hypothesis proposed to explain the genetic variation of the trait. Three lines of prolificacy classified as noncarriers or low line (LL) and carriers of the gene: medium (ML) and high line (HL) averaged 1.24, 1.81 and 2.26 lambs, respectively. from Ewes different prolificacy lines performed distinctly in different years (P<0.01); with HL animals being more sensitive to environmental fluctuation. Primiparous ewes had 10 to 13% smaller litters (P<0.01) than ewes at later parities. The repeatability for litter size was 0.51 while the within line 0.33, 0.15 and 0.24 Heritability was 0.62. for LL, Changes ML, in and HL, respectively. survival were due to Prolificacy-Year and ewe weight gain during gestation (P<0.01). Survival in the HL was 44% lower than that of ML and LL in poor years. Lamb survival for quadruplets was 86, 67, 44, singles, and twins, triplets and 31% respectively. Lower survival of their lambs (64.9%) as compared to later parities (74.6%) (P<0.01), was recorded in primiparous ewes mainly due to low body weights. Two main causes associated with lamb mortality were studied: ewe weight gain during gestation and lamb birth weight, which have a relative contribution of in the determination of this trait…dst
Keyword: Sheep production, Lamb Size At Birth, Lamb Production At Weaning

Judul: Profil Aerodinamika Airfoil NACA 4312 dengan Variasi Sudut Gurney Flap
Abstrak: Analisa profil aerodinamika sangatlah penting untuk mengetahui kinerja yang optimal dalam memperoleh gaya angkat dan gaya hambat pada airfoil. Desain airfoil NACA seri 4312 dibentuk dengan software Autodesk Inventor. Simulasi menggunakan metode Computational Fluid Dynamic (CFD) dengan software Autodesk Simulation CFD dengan mengamati distribusi aliran fluida yang mengalir disekitar airfoil. Profil kecepatan aliran udara dan tekanan yang terbaca pada Autodesk Simulation CFD bervariasi karena tergantung posisi kemiringan sudut dari gurney flap. Hasil analisis menunjukkan aliran fluida di leading edge dan trailing edge pada airfoil tanpa gurney flap tidak mengalami perbedaan profil aliran udara dan tekanan yang signifikan. Pemasangan gurney flap dengan sudut 45o dan 90o memiliki perbedaan tekanan dibagian atas dan bawah airfoil. Gurney flap dengan sudut 90o menunjukkan bahwa gaya hambat yang diterima lebih besar akibat posisi gurney flap yang tegak lurus dengan trailing edge sehingga tekanan dibagian atas lebih kecil dan memiliki gaya angkat yang semakin besar.
Keyword: Aerodinamika, airfoil NACA, gurney flap, leading edge, trailing edge