Judul: Kajian Pola Hubungan Antara Sifat Fisik dan Komposisi Kimiawi Bahan Pakan Hijauan
Abstrak: The physical properties are indicator of testing the quality of raw material which is very important in addition to chemical and biological tests. This research observed physical properties and chemical composition of forage materials Gliricidia sepium, Calliandra calothyrsus, Leucaena leucocephala, Indigofera sp, Trichantera gigantea, Carica papaya, Manihot utilissima, and the relationship between the physical properties and chemical composition of the feed materials. The study was conducted for 2 months by measuring physical properties and proximate and van soest for chemical composition analysis of forage. The results showed that specific gravity was negatively affected by crude protein (r = - 0.654) and positively affected by ash (r = 0.692) were significantly different at P < 0.05. Bulk density negatively affected by crude protein (r = - 0.522) were significantly different at P < 0.05. Bulk density compaction negatively affected by crude protein (r = - 0.644) and neutral detergent insoluble crude protein (r = - 0.767) were significantly different at P < 0.05. It can be concluded that the relationship between physical properties and chemical composition of forage have a small effect excepted for the crude protein.
Keyword: physical properties, forage, chemical composition

Judul: Kajian Pola Hubungan Antara Sifat Fisik Dan Komposisi Kimiawi Bahan Pakan Konsentrat
Abstrak: Sifat fisik merupakan salah satu metode uji kualitas bahan baku yang sangat penting selain uji secara kimia dan biologis yang dilakukan untuk mengetahui kualitas bahan pakan. Dalam penelitian ini diamati sifat fisik dan komposisi kimia beberapa bahan pakan konsentrat serta hubungan antara sifat fisik dan komposisi kimia bahan pakan tersebut. Penelitian dilakukan selama 2 bulan dengan menggunakan metode Khalil untuk sifat fisik dan analisis proksimat dan van soest untuk komposisi kimia. Diperoleh hasil berat jenis (BJ) berkolerasi positif dengan ABU (r = 0.57; P < 0.05). Sudut tumpukan (ST) berkolerasi positif dengan serat kasar (SK) (r = 0,68; P < 0.05), berkolerasi negatif dengan protein kasar (PK) (r = -0.89; P < 0.01), dan berkolerasi negatife dengan ADICP (r = - 0.86; P < 0.05). KT berkolerasi positif dengan PK (r = 0.77; P < 0.05). KPT berkolerasi positif dengan PK (r = 0.65; P < 0.05). Dapat disimpulkan bahwa beberapa sifat kimia pakan memiliki hubungan dengan sifat fisik pakan.
Keyword: bahan pakan konsentrat, komposisi kimia, sifat fisik

Judul: A Continuous Vaccination Strategy in the SVIR Epidemic Model
Abstrak: Vaccination is conducted to minimize the spread of a disease. The vaccination is usually done several times within a fixed time interval. In the SVIR model, it is assumed that individuals do not get immediate immunity following a vaccination program. So according to process of vaccination on SVIR model, there are two strategies, i.e. the continuous vaccination strategy (CVS) and the pulse vaccination strategy (PVS). In this study, only the CVS strategy in epidemic model SVIR is considered. Results of the study indicate that dynamics of the CVS system depends on the basic reproductive number. If the basic reproductive number is less than one, then the disease-free fixed point is asymptotically stable. It means that the disease will eventually disappear from the population. Conversely, if the basic reproductive number is greater than one, then the endemic fixed point is asymptotically stable, which means that the disease will remain exist in the population. Simulation result shows that the vaccination would minimize the spread of disease by reducing the basic reproductive number. If the time for the vaccinated recipients to obtain the immunity, as well as a possibility of vaccinated recipients to be infected are neglected, then the disease will be eradicated. This condition is called an over-evaluating effect of vaccination.
Keyword: