Judul: Subsitusi Konsentrat Komersil dengan Tepung Indigofera (Indigofera sp.) untuk Konsumsi Pakan, Kecernaan dan Produksi Susu Sapi Friesian Holstein (FH)
Abstrak: South Bandung district is one of the largest milk-producing areas in West Java. Sub-district Pasirjambu is a part of Bandung Selatan regency that have big potential in dairy cattle breeding. The problem in this area is low production of milk produced by farmers and the high price of the commercial feed concentrates, so it influences market value for milk and welfare farmers. Indigofera sp. mesh in this research was used as commercial concentrates substitution. This research using randomized design group (RAK method – ANOVA) on 3 group based on milk production. Nine Friesian Holstein (FH) cows with random treatment. The treatment P0 (100% concentrates : 0% Indigofera sp.), P1 (80% concentrates : 20% Indigofera sp.), and P2 (60% concentrates : 40% Indigofera sp.). The results showed that substitution of Indigofera sp. mesh can substitute concentrate to 40% as a commercial concentrate substitution does not affect milk feed intake, digestibility and milk production.
Keyword: milk production., Indigofera sp, feed intake, digestibility, commercial concenstrat

Judul: Efek Pemberian Tepung Indigofera (Indigofera sp.) Sebagai Substitusi Konsentrat Komersial terhadap Produksi dan Kualitas Susu Sapi FH
Abstrak: This research aimed to evaluate the use of Indigofera (Indigofera sp.) meal as substitute of commercial concentrate on the quantity and quality of milk of Friesien Holstein cows at Pasirjambu districts. This research used a randomized block design and analysis of Covariance (RBD - ANCOVA), in 3 levels of concentrates and Indigofera meal with 3 replications as a block based on milk production levels. Nine of dairy cows were used and offered treatments randomly. The treatments were R0 (60% forage + 40% concentrate), R1 (60% forage + 32% concentrate + 8% Indigofera meal) dan R2 (60% forage + 24% concentrate + 16% Indigofera meal). The results showed that there was no significant different on protein, fat, SNF, lactose, density, salt and freezing point of milk among treatment. This means Indigofera meal added as substitute of commercial concentrate did not negative affect milk quantity and quality. Thus, indigofera can be used as substitute to commercial concentrate up to 16%.
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Judul: Penentuan Nilai Eigen dan Vektor Eigen dari Matriks Tridiagonal 2-Toeplitz dengan Pendekatan Polinomial Chebyshev
Abstrak: The eigenvalues and eigenvectors of a matrix can be determined by finding its characteristic polynomials. The characteristic polynomials of a tridiagonal 2-Toeplitz matrix is shown to be closely connected to polynomials which satisfy the Chebyshev recurrence relationship. If the order of the matrix is odd, then the eigenvalues are found explicitly in terms of the Chebyshev zeros and the eigenvectors are found in terms of the polynomials satisfying the recurrence relationship. For even ordered matrices, the situation is more complicated. The problem in these cases is that although the Chebyshev recurrence formula is still applied, its initial values are not generating Chebyshev polynomials
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