Judul: Persentase dan Kualitas Karkas Itik Cihateup-Alabio (CA) pada Umur Pemotongan yang Berbeda
Abstrak: Low demand of duck meat is influenced by its quality. Generally, ducks slaughtered at 8 weeks have low carcass quality. Slaughter age is expected to influence carcass quality. Therefore, the study of carcass quality in different slaughter ages (8, 10, and 12 weeks) is needed. This research used 32 males and 18 females cihateup-alabio (CA) ducks. Ducks were grouped by hatching period. The experiment design was randomized block factorial (3x2). Treatments were slaughter age and sex. Traits measured were slaughter weight, percentage of carcass and its parts, physical and sensory quality of duck carcass. The result showed that interaction of slaughter age and sex affect slaughter weight. The higher slaughter age resulted higher breast and abdominal fat percentage, but had smaller thigh percentage. Sex had no effect on carcass percentage and its parts. Higher slaughter age and male sex showed better phisycal carcass quality. Differences in slaughter age and sex had no effect on panelist preference. This research concluded that higher slaughter age produces better carcass percentage and quality.
Keyword: 

Judul: Pendugaan Umur Itik Alabio dan Cihateup Berdasarkan Tempat Tumbuh Bulu Tetap pada Bagian-Bagian Tubuh
Abstrak: Duck selection for replacement is difficult for farmers, as day old duck (DOD) are generally sold in a group although they have different ages. The purpose of this study was to estimate the age of ducks (cihateup and alabio) through the growth of fixed feather on the body. A total of 143 alabio ducks eggs originate from Borneo and 32 cihateup ducks from Tasikmalaya had hatched in Animal Husbandry Hatching Laboratory then grew up at the Field Laboratory of Poultry Production, Bogor Agricultural University. The results showed that the overall changing of hatching feathers into fixed feathers on both types of ducks is observes successively from the chest, armpits, upper back, tail, lower back, neck, wing primary and secondary wings. The alabio ducks hatching feathers substitution into fixed feathers were faster than cihateup ducks. Cihateup ducks showed changing of hatching feathers into fixed feathers in its chest in weeks 4, while the alabio ducks showed changing in the chest, armpit and upper back on the same week. Alabio ducks changed all the fixed feathers in their body on weeks 6, mean while cihateup duck on weeks 7.
Keyword: 

Judul: Aproksimasi Fungsi Sinus dan Kosinus sebagai Kombinasi Linear dari Fungsi Eksponensial
Abstrak: Salah satu gagasan yang menarik dalam matematika adalah aproksimasi suatu fungsi oleh fungsi lain. Sebagai contoh, fungsi polinom dapat diaproksimasi menggunakan deret Taylor atau fungsi persamaan diferensial dapat diaproksimasi menggunakan deret Fourier. Adapun fungsi yang dapat mengaproksimasi fungsi lain salah satunya adalah fungsi eksponensial. Kemungkinan mengaproksimasi fungsi dengan kombinasi linear dari fungsi eksponensial dari bentuk eˣ, e²ˣ, ... dianggap sebagai perkembangan sejajar dengan gagasan Deret Taylor yang mengaproksimasi fungsi dengan kombinasi linear dari segi fungsi kuadrat. Fungsi sin x dan cos x digunakan sebagai target untuk menilai seberapa baik aproksimasi yang dilakukan oleh fungsi yang diberikan. Aproksimasi fungsi sinus dan kosinus menggunakan hampiran Taylor lebih akurat dibandingkan dengan aproksimasi menggunakan fungsi eksponensial.
Keyword: Aprosimaksi eksponensial, aproksimasi fungsi, aprosimaksi Taylor, fungsi eksponensial