Judul: Altering physiological conditions and semen acidity by manipulating dietary cation-anion difference and their effect on sperm characteristics of garut breed rams
Abstrak: This study was carried out to evaluate the effect of dietary cation-anion difference (DCAD) and fish oil supplementation on dry matter intake, dry matter and organic matter digestibility, weight gain, acidity of urine, blood and semen, blood gas, plasma mineral, sperm characteristics and ratio of X:Y spermatozoa. The dietary treatmens were as follows: RN0= basal ration (DCAD +14) without fish oil, RNI= basal ration (DCAD +14) with 3% fish oil, RB0= base ration (DCAD +40) without fish oil, RBI= base ration (DCAD +40) with 3% fish oil, RA0= acid ration (DCAD -40) without fish oil, and RAI= acid ration (DCAD -40) with 3% fish oil. The rations contained 150 ppm of zinc and were offered to 18 of Garut breeed rams. The result indicated that: DCAD +40 and -40 decreased dry matter intake significantly. The ration with DCAD +40 had the lowest dry matter intake. No differences were observed for dry matter and organic matter digestibility. DCAD +40 and -40 decreased body weight of rams except RA0 ration, however, the body weight of rams was very low. Variation of urine pH followed the DCAD pattern. Blood pH, pCO2, and pO2 were not affected by DCAD, but cHCO3 and cBase were affected. DCAD affected plasma Mg and S, but did not affect K, Na, Zn and Cl. Semen pH after day 28 of experimental period were significantly different and that followed DCAD pattern. There were not differences for X:Y ratio, macroscopic and microscpic characteristic of sperm.
Keyword: dry matter intake, semen PH, sperm characteristics, basal ration, West Java

Judul: Kualitas Semen Domba Garut dengan Pemberian Pakan Limbah Tauge dan Indigofera sp pada Pengencer Tris Kuning Telur.
Abstrak: Garut ram is one of good comodity of the livestock, but still traditional management systems. This is a delimiter in garut ram heir superior quality. Semen preservation in several extender can be as choice to maintain genetic superior of garut ram. Semen quality itself affected by the nutrient factors contained in the waste bean sprouts and Indigofera sp such as protein and vitamin E, which is capable of affecting the quality of spermatozoa in garut ram. The research was aimed to study the influence of feeding with 30% waste bean sprouts and 30% Indigofera sp on sperm quality in the tris egg yolk extender. Semen sample were collected from 4 garut male with age around 11 months were two garut ram was fed with limbah tauge and two garut ram was fed with Indigofera sp. Collected semen were diluted in tris egg yolk extender and stored at refrigerator 5 oC until fifth days. Parameter of semen quality was analyzed as follow: for the colour, consistency, pH, volume semen and sperm mass movement were expressed with descriptively analysis. Concentration and cytoplasmic droplet were tested by T-Test analysis. Sperm motility, sperm viability, integrity of sperm plasma membrane and sperm secondary abnormality were analyzed using Completely Randomized Design Factorial (2x5). The first factor was fed (waste bean sprouts and Indigofera sp) and the second factor was storage time (day 1st,2st,3st,4st and 5st). Data was analyzed by Analysis of Variance (ANOVA) and continued with Duncan test to observed the different between treatments. Result of the experiment showed descriptively: colour, concistency and semen pH in all treatment have same quality. Semen volume were collected from garut ram with fed waste bean sprouts better than with fed Indigofera sp, whereas sperm mass movement with fed Indigofera sp better than with fed waste bean sprouts. T-test analyzed showed all treatment were not significant different (P>0,05) to sperm concentration and cytoplasmic droplet. Analysis of Variance showed sperm motility in all treatment were not significant different (P>0,05) whereas in first and second days storage significant better than after third storage (>40%). Such as with sperm viability and integrity of sperm plasma membrane were significant maintaint until fourth storage with percentage (>60% and >50%). Percentage sperm secondary abnormality in treatment with fed Indigofera sp significant better than treatment with fed waste bean sprouts. It can be summarized that all treatment were not influence to sperm quality garut ram 11 years old, but storage time influential to sperm motility, sperm viability, and integrity of sperm plasma membrane. It is suggested to do further research the influence of both feed on adult ram.
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Judul: Bifurkasi lokal pada titik tetap non-hiperbolik
Abstrak: Bifurkasi menggambarkan perubahan pada struktur orbit di sekitar titik tetap. Titik tetap dibagi menjadi dua yaitu titik tetap hiperbolik dan titik tetap non-hiperbolik. Titik tetap non-hiperbolik terjadi jika ada nilai eigen dengan bagian real sama dengan nol. Kestabilan dari titik tetap dapat diketahui dari nilai eigen yang diperoleh dari pelinearan medan vektor. Pada bifurkasi satu-dimensi ditemukan kasus-kasus untuk bifurkasi saddle-node, bifurkasi transcritical dan bifurkasi pitchfork. Bifurkasi saddle-node terjadi jika satu sisi dari nilai parameter tidak terdapat titik tetap dan pada sisi lain terdapat dua titik tetap, dimana yang satu stabil dan yang lainnya tak-stabil. Bifurkasi transcritical terjadi jika terdapat pertukaran kestabilan, yaitu dari titik tetap stabil menjadi titik tetap tak-stabil dan sebaliknya. Sedangkan bifurkasi pitchfork dibagi menjadi dua, yaitu: bifurkasi pitchfork supercritical dan bifurkasi pitchfork subcritical. Bifurkasi pitchfork supercritical terjadi jika satu titik tetap stabil berubah menjadi dua titik tetap stabil dan satu titik tetap tak-stabil, dan bifurkasi pitchfork subcritical terjadi jika satu titik tetap stabil dan dua titik tetap tak-stabil berubah menjadi satu titik tetap tak-stabil. Bifurkasi Hopf (bifurkasi dua-dimensi) terjadi jika terdapat orbit periodik pada struktur orbitnya yang berupa lingkaran dengan jari-jari konstan. Ada atau tidaknya orbit periodik dapat diketahui setelah sistem ditransformasikan ke dalam koordinat polar. Orbit periodik ini dapat bersifat stabil maupun tak-stabil. Model periklanan (advertising) Feichtinger merupakan salah satu contoh penerapan bifurkasi Hopf Model ini menghasilkan satu titik tetap dan orbit periodik yang bersifat stabil.
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