Judul: Evaluasi kecukupan nutrien sapi fries holland periode laktasi ke-3 dan ke-4 di PT. Taurus Dairy Farm, Cicurug, Sukabumi
Abstrak: The aim of this research was to evaluate dairy cattle performances according to nutrient requirement especially third and fourth lactation period. The measured parameters were body weight, milk production, feed consumption and nutrient balance. The cows were divided into two groups according to the body weight. Those groups were groups of heavier body weight and groups of lighter body weight in each lactation period. According to lactation curve, the peak of milk production was reached at second rnontl~ of lactation period. The heavier cows groups included in third lactation and fourth lactation period were insufficient of energy (Total Digestible Nutrient). In addition, the heavier cows in fourth lactation period suffered crude protein insufficiency. Otherwise, the lighter cows groups included in both lactation period were abundantly required in dry matter, Total Digestible Nutrient, crude protein, calsium, and phosphorus. Keywords : lactation period, milk production, body weight, nutrient balance
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Judul: Profil reproduksi sapi fries holland di PT Taurus Dairy Farm
Abstrak: A research was carried out to observed effect of lactation period and season on reprodu~tivep erformance of Holstein cows in PT Taurus Dairy Farm (PT TDF). Data of fist service afier calving (FS), service per conception (SIC), days open (DO), conception rate (CR) and calving interval (CI) were collected from 438 animals recorded fiom 1998 to 2004. Rain fall data were collected from Office for research of spices and medicine. The data then clasified according to Schmidth- Ferguson classification. Mitab ver. 14 software was used to analyzed the data. Reproductive performance of PT TDF, except for CR, are going to be better year by year. The reproductive performance, except for SIC, are also going to be better by lactation period. Tb: effect of season (dry vs rain seasons) on the reproductive performance were not observed. Keywords : reproductive performance, lactation period, rainfall
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Judul: Analisis Keamanan Skema El-Gamal Signature pada Penandaan Digital.
Abstrak: Bertukar informasi merupakan hal yang sering dilakukan, namun menjadi sulit dilakukan dikarenakan adanya pihak yang tidak berwenang mampu mengakses bahkan memalsukan informasi tersebut. Hal ini disebabkan karena sebuah infomasi yang dipertukarkan sulit dipastikan keasliannya, oleh sebab itu informasi yang dipertukarkan akan diberikan sebuah tanda unik agar kerahasiaan dan keaslian informasi dapat dijaga keamanannya oleh pihak yang bertukar informasi. Penandaan informasi yang dibubuhkan pada suatu dokumen digital dikenal sebagai digital signature, yang merupakan salah satu teknologi yang digunakan untuk meningkatkan keamanan jaringan pada dokumen berbentuk digital. Digital signature dapat memastikan bahwa data yang dipertukarkan adalah data yang sebenarnya dan ada dua syarat kemanan jaringan yang dipenuhi yaitu Authenticity dan Nonrepudation. Untuk membuat tanda tangan digital diperlukan teknik matematika yang dikenal dengan kriptografi. Salah satu metode yang digunakan untuk membuat tanda tangan digital adalah skema El-Gamal signature. Pada bahasan kali ini akan dijelaskan mengenai mekanisme penandaan digital menggunakan metode El-Gamal signature serta bagaimana cara menerapkannya pada perangkat lunak Maple 13.
Keyword: digital signature, El-Gamal, penandaan