Judul: The Overview of Calcium (Ca) Phosphorus (P) Levels in Blood of Dairy Cattle (Friesian Holstein) and Mineral Levels in Feedstuff.
Abstrak: Serum mengandung beberapa substansi penting di antaranya mineral, enzim, bilirubin, kreatinin, serta nutrien lainnya. Kalsium (Ca) dan fosfor (P) termasuk mineral yang sangat dibutuhkan oleh sapi perah karena memiliki peran biokimia dan fisiologis untuk menjalankan fungsi-fungsi tertentu dalam tubuh dan sapi hanya dapat memperoleh kedua mineral tersebut dari pakan. Penelitian ini bertujuan mengetahui gambaran kadar kalsium (Ca) fosfor (P) dalam darah sapi perah (Friesian holstein) dan kadar mineral pada pakan. Penelitian ini juga menggunakan metode deskriptif untuk menganalisis gambaran kadar kalsium (Ca), fosfor (P) dalam darah sapi perah FH dan kadar mineral pada pakan. Hasil pemeriksaan serum menunjukkan dua sampel memiliki kadar kalsium (Ca) fosfor (P) yang tergolong diatas standar nilai normal, dan satu sampel lainnya tergolong sesuai standar nilai normal. Hasil analisis proksimat menunjukkan kadar nutrien mineral pada pakan masih tergolong di bawah besaran angka dari penyerapan nutrien mineral kalsium (Ca) dan fosfor (P) pada saluran pencernaan usus halus yang dimanisfestasikan dengan kadar kedua nutrien mineral dalam darah pada umumnya. Tingginya kadar mineral (Ca, P) pada darah sapi perah FH dikarenakan kadar mineral (Ca, P) yang diperoleh tidak hanya dari hasil konsumsi mineral (Ca, P) murni pakan konsentrat saja, namun juga bisa diperoleh dari hasil proses pencernaan komposisi penyusun ransum (pakan) lainnya yaitu dari pakan hijauan.
Keyword: serum, pakan, kalsium, fosfor, FH

Judul: Gambaran Kalsium dan Fosfor Darah Sapi Perah FH (Friesian Holstein) pada Masa Pertumbuhan
Abstrak: The aim of this study was to know the profile of calcium and phosphorus in blood of FH (Friesian Holstein) dairy cow during growth. Twenty five serum samples were collected from healthy dairy cows that divided into five groups. Each group consisted of five dairy cows are differentiated by age, one month, three months, six months, nine months, and twelve months. Blood sampels were taken from the jugular vein, calcium and phosporus of the serum were examined using spectrophotometry. The results showed levels of calcium in blood of dairy cow ranging from 7,5±0,38 to 8,7±0,07 mg/dl. The highest calcium of blood levels was obtained from dairy cows at age three months. Levels of phosphorus in blood of dairy cow ranging from 3,3±1,15 to 6,5±1,75 mg/dl. The highest of phosphorus blood levels was obtained from dairy cows at age six months. The lowest of calcium and phosphorus blood levels was obtained from dairy cows at age nine months.
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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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