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 Hijauan Fermentasi (Hi-fer+) dan Konsentrat Standar terhadap Produksi dan Kualitas Susu Sapi Perah Friesian Holstein
Abstrak: Hijauan fermentasi (Hi-fer+) adalah contoh penyediaan hijauan yang difermentasi menggunakan komplemen pakan (KP) dan molasses. Penelitian ini bertujuan untuk menguji pengaruh pemberian Hi-fer+ dan konsentrat standar (PK 17.10%; TDN 71.05%) terhadap produksi dan kualitas susu sapi perah. Rancangan acak kelompok digunakan dalam penelitian ini (3 perlakuan; 4 ulangan); perlakuan terdiri atas: P0=hijauan peternak (rumput gajah/jerami padi) + konsentrat lokal, P1=hijauan peternak (rumput gajah/jerami padi) + konsentrat standar, P2=hijauan fermentasi (Hi-fer+) + konsentrat standar. Data dianalisis dengan sidik ragam (ANOVA) dan uji ortogonal kontras. Perlakuan tidak mempengaruhi produksi dan kualitas susu (lemak, protein, laktosa, SNF, total solid dan densitas), pertambahan bobot badan, efisiensi penggunaan pakan dan persistensi laktasi. Pemberian Hi-fer+ dan konsentrat standar mampu meningkatkan kadar lemak susu sebesar 36.5%, mempengaruhi body condition score (BCS) (P<0.05), memperbaiki total plate count (TPC), meningkatkan konsumsi bahan segar hijauan dan memberikan income over feed cost yang lebih besar bagi peternak.
Keyword: Hi-fer+, konsentrat standar, kualitas susu, produksi susu

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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