Judul: Pengaruh Kombinasi Beberapa Bahan Pengencer dan Kuning Telur terhadap Motilitas Spermatozoa Ayam Buras secara in-Vitro
Abstrak: Ayam buras atau ayam kampung mempunyai peranan penting dalam penyediaan bahan pangan yang berupa protein hewani yang mencapai 17,67 % kebutuhan telur dan 17,21 % kebutuhan daging dari total produk telur dan daging unggas nasional. Penelitian ini bertujuan untuk mengetahui bahan pengencer yang tersedia di pasaran dan mudah didapat yang mampu mempertahankan motilitas spermatozoa ayam buras dalam jangka waktu lama, sehingga pelaksanaan IB dapat dilakukan secara mandiri oleh peternak. Penelitian dilakukan di Laboratorium Ladang Terpadu dan Laboratorium Fisiologi dan Inseminasi Buatan, bagian Reproduksi dan Kebidanan, Fakultas Kedokteran Hewan, Institut Pertanian Bogor.
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Judul: Pengaruh Beberapa Pengencer Semen, Lama Penyimpanan Semen dan Waktu Inseminasi Terhadap Fertilitas Spermatozoa Ayam Buras
Abstrak: Penelitian bertujuan untuk 1) mengetahui pengencer semen ayam buras yang secara tehnis layak untuk IB dan dapat mempertahankan fertilitas spermatozoa; dan 2) untuk mengetahui waktu pelaksanaan IB yang tepat pada ayam buras. Penelitian dibagi dalam dua tahap yaitu: tahap pertama evaluasi semen segar dan semen cair yang dilakukan di Laboratorium Biologi Reproduksi Program Pascasarjana IPB Bogor mulai dari bulan Januari sampai Mei 1995. dan tahap kedua yaitu IB yang dilakukan di Peternak Ayam Buras Kota Administratif Depok Jawa Barat dan penetasan telur hasi! IB di Balai Penelitian Ternak Ciawi Bogor mulai dari bulan Juni sampai Oktober 1995. Penelitian tahap pertama yaitu evaluasi semen segar dan semen cair bertujuan untuk menguji kelayakan pengencer semen dan kualitas spermatozoa sebelum digunakan untuk IB. Semen yang telah ditampung dari 10 ekor ayam jantan dengan menggunakan metode pemijatan, digabung menjadi satu dalam tabung berskala kemudian dilakukan pemeriksaan makroskopis dan mikroskopis. Pemeriksaan makroskopis meliputi: volume, warna, konsistensi dan pH, sedangkan pemeriksaan mikroskopis meliputi : gerakan massa, konsentrasi, motilitas dan hidup spermatozoa. Semen yang berkualitas baik selanjutnya diencerkan dengan tiga macam pengencer yaitu: tris phosphat (A,). tris asetat (A). dan bikarbonat kuning telur (A) sampai dengan konsentrasi 1000 juta spermazoa motil progressif per ml semen, kemudian disimpan didalam lemari es dengan suhu 5 °C. Pengamatan pH, motilitas, kualitas motil dan hidup spermatozoa dilakukan pada awal dan setiap 8 jam penyimpanan sampai dengan spermatozoa mati....dst
Keyword: Ayam buras

Judul: Thermal Characteristics and Dynamics of Tropical Cyclone over Western North Pacific Ocean: A Case Study of Typhoon Songda (Chedeng) 2011
Abstrak: The frequent occasion of Tropical Cyclone (TC) over Western North Pacific (WNP) Ocean lies from 10˚N to 26˚N and 121˚E to 170˚E. Sources of TC development come from warm ocean temperature where latent heat is released during condensation processes and subsequently concentrated in the boundary layer. Relative humidity at 850-700 hPa is responsible to produce the most intense storm. Meanwhile, weak vertical wind shear between 850-200 hPa is one of the dynamical factors that lead to the development of TC. Pressure level of 850-200 hPa is chosen to minimize the thermodynamic effect in the lower troposphere. Typhoon Songda (Chedeng in the Philippines) or TSC lasted from May 18th to 30th, 2011 and strengthened into powerful Super Typhoon stage between May 24th and 27th. Long curving track and the exhibition of all sequences of TC life cycle, TSC is then considered as an ideal case of TC. The objective of the study with case of TSC is to investigate the role of thermal characteristics and dynamics on TC intensity. The research is carried out by using Advanced Research of Weather Research and Forecasting model (WRF ARW model) version 3.3. Two domains are employed in the model. The first domain situate from 02˚N to 40˚N and 118˚E to 149˚E and cover spatial resolution () of 33.1 km. The second domain situate from 09˚N to 27˚N and 119˚E to 132˚E with of 11 km. Timestep of the model () is 120 seconds. The model is supported by the following physical parameterization, i.e., Yonsei University Scheme (YSU) in the boundary layer, Kain-Fritsch scheme (KF) in the cumulus, and WRF Single-Moment 3-class scheme in the microphysics. Initial meteorological condition prior to the formation of the cyclone is generated using WRF ARW standard-release model. Sensitivity of the model output is obtained from a selected single-parameter change scenarios, namely, 10 % to 20 % decrease and increase of wind shear initial data at 850-200 hPa, and by 10 % to 20 % decrease of relative humidity initial data at 850-700 hPa. The result showed that the negative correlations between wind shear and intensity are found in wind shear scenarios. Wind shears of 10 ms-1 which lead to strengthening of the wind intensity in the early period of Typhoon development are found in wind shear scenarios. The effect of wind shear changes on wind intensity is statistically significant in the 20 % wind shear scenarios. During mature stage, weak wind intensity occurred when wind shear increase as given in the WRF standard-release and the 20 % decreasing scenario. Different situation is found in the 20 % increasing scenario where wind shear tend to weak and lead to strong wind intensity at this stage. Meanwhile, the reduction of moisture supply at 850-700 hPa resulting from 20 % decreasing relative humidity play a major role in the weakening of wind intensity and reduces mechanical energy of the cycle process as much as 300 J kg-1.
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