Judul: Perbedaan Kualitas Nutrisi Hijauan Pada Musim Hujan dan Kemarau Serta Pengaruhnya terhadap Produksi dan Kualitas Susu di Kampung Barunagri, Lembang, Bandung Utara.
Abstrak: Availabilities of quality forages fluctuated during the year. In dry season, where plants grow slower and their qualities drop rapidly, is one of the hardest season for dairy farmer. High cattle stocking rate and limited available land hit the farmer harder. Barunagri village is one of the cattle stocking rate in Lembang Regency. The farmer experienced the difficulties of affording forage during dry season for several years. The research was aimed to studying the influence of season on availability quality forage and their impact on milk production and quality. The study have been conducted during wet and dry season (2007/2008) and observed 27 respondent from 8 different farmer groups. The study used both primary and secondary data. Parameter observed in the study included availability of quality forage, feed intake, milk production and quality. The data were described or analyzed used T-test. During dry seasons, forage qualities and availabilities as well as milk production were significantly lower in compare to wet season. However, milk fat contents were higher during dry season. Although Barunagri farmer had difficulties in affording high quality forages for their cows during dry seasons, but the farmer provided forage with lower quality and added with some agriculture by product that could maintained body weight of the animal but lowering milk production.
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Judul: Evaluasi Kecukupan Nutrisi Sapi Perah di Kawasan Usaha Peternakan Cibungbulang Bogor, Jawa Barat
Abstrak: The study is aimed to evaluate nutritional status of cows and their relation to animal performance at two different seasons (drought and rainy). The study was conducted in two phases. First phase was drought season data collecting for 3 months and the second phase was rainy season data collecting. The sample collected was examined in Dairy Nutrition and PAU laboratories IPB (March – June 2013). Variable was measured including the type and amount of feeds and nutrients offered, milk production and quality, body condition score. The collected data was tabulated and analyzed using descriptive statistic. Comparison between nutrients offered and standard requirement was analyzed using T-test. T-test have also been used to compare nutritional status of animal in rainy and drought seasons. The result showed that farmers in KUNAK have offered sufficient amounts of nutriens for their cows exept for Ca, when drought season came, deficiency of P was also occured. Milk yield tent to decrease during drought season but milk fat content increase during drought season but milk fat content increased. It is concluded that imbalance ration is one of the cause for low average milk production in KUNAK.
Keyword: nutrient adequacy, milk quality, milk production, dairy cows

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