Judul: Physiological Response and Production Performance of Chicken IPB-D1 in the intensively maintened and Free-Range
Abstrak: Ayam IPB-D1 merupakan hasil persilangan antara ayam jantan lokal F1 PS (Pelung x Sentul) dengan betina F1 KB (Kampung x Parent Stock Broiler) yang telah ditetapkan sebagai rumpun baru ayam lokal oleh Kementerian Pertanian RI. Produktivitas ayam dipengaruhi oleh beberapa faktor, yaitu internal (genetik), eksternal (pakan, lingkungan dan manajemen pemeliharaan) dan interaksi antara keduanya (Nataamijaya et al. 2010). Manajemen pemeliharaan yang baik dapat dilihat dari kondisi kandang dan lingkungan yang nyaman, menyebabkan tingkat stres pada ternak akan berkurang. Kondisi lingkungan pemeliharaan yang mempunyai pengaruh signifikan terhadap performa adalah suhu dan kelembapan lingkungan. Suhu lingkungan pemeliharaan yang tinggi dapat menyebabkan stres oksidatif. Stres oksidatif merupakan ketidakseimbangan antara radikal bebas (pro oksidan) dan antioksidan yang dipicu oleh dua kondisi umum yaitu kurangnya antioksidan dan kelebihan produksi radikal bebas (Rush et al. 2005). Beberapa studi mengatakan bahwa semakin tinggi kadar stres oksidatif akan meningkatkan peroksidasi lipid yang dipresentasikan sebagai malondialdehida (MDA) dan menurunkan aktivitas enzim Superoxide dismutase (SOD) (Abramov, Scorziello, & Duchen, 2007). Salah satu cara mengatasi hal tersebut yaitu dengan sistem manajemen free-range. Ayam yang dipelihara dengan sistem intensif dan sistem free-range berjumlah 50 ekor dengan waktu penelitian selama 5 minggu. Data yang diperoleh dianalisis secara deskriptif. Hasil penelitian menunjukkan bahwa pemeliharaan ayam IPB-D1 dengan sistem free-range menghasilkan kondisi fisiologis dan performa produksi yang lebih baik dibandingkan dengan pemeliharaan intensif. Kesimpulannya, pemeliharaan dengan sistem free-range menunjukkan kondisi yang lebih baik dibandingkan pemeliharaan intensif. Kondisi fisiologis ayam yang dipelihara pada sistem free-range menunjukkan tingkat stres yang rendah (kimia darah, nilai hematologi, dan indikator stres). Sistem free-range menghasilkan kinerja produksi yang lebih baik ditandai dengan rendahnya konversi pakan selama pemeliharaan., IPB-D1 chicken is the result of a cross between local F1 PS (Pelung x Sentul) roosters and F1 KB (Kampung x Parent Stock Broiler) females which have been designated as new clumps of local chickens by the Indonesian Ministry of Agriculture. Chicken productivity is influenced by several factors, namely internal (genetic), external (feed, environment and maintenance management) and the interaction between the two (Nataamijaya et al. 2010). Good maintenance management can be seen from the conditions of the pen and a comfortable environment, causing the level of stress in livestock to be reduced. Maintenance environment conditions that have a significant influence on performance are environmental temperature and humidity. High maintenance environment temperatures can cause oxidative stress. Oxidative stress is an imbalance between free radicals (pro oxidants) and antioxidants triggered by two common conditions namely lack of antioxidants and overproduction of free radicals (Rush et al. 2005). Some studies say that higher levels of oxidative stress will increase lipid peroxidation presented as malondialdehyde (MDA) and decrease the activity of the enzyme Superoxide dismutase (SOD) (Abramov, Scorziello, & Duchen, 2007). One way to overcome this is with a free-range management system. Chickens raised with an intensive system and free-range system totaled 50 heads with a research time of 5 weeks. The data obtained are analyzed descriptively. The results showed that the maintenance of IPB-D1 chickens with a free-range system resulted in better physiological conditions and production performance compared to intensive maintenance. In conclusion, maintenance with a free-range system
Keyword: free-range, heat stress, IPB-D1 chicken, performance

Judul: Kinerja Ayam IPB-D1 Jantan dan Betina pada Pemeliharaan Sistem Free-range.
Abstrak: Ayam IPB-D1 merupakan ayam lokal yang memiliki keunggulan. Sistem pemeliharaan free-range adalah model pemeliharaan yang memberikan akses lahan penggembalaan. Penelitian ini bertujuan untuk mengkaji performa ayam jantan dan betina melalui pemeliharaan di kandang bebas. Tahapan penelitian meliputi pemeliharaan sistem free-range, pembuatan pakan, dan pengamatan variabel yaitu bobot badan, kecuali konsumsi, konversi pakan, konversi pakan, mortalitas, dan pendapatan atas pakan dan biaya ayam. Penelitian menggunakan 15 ekor ayam jantan dan 15 ekor ayam betina. Ayam IPB-D1 jantan memiliki jumlah konsumsi pakan, pertambahan bobot badan, konversi pakan, mortalitas, serta indeks over feed chick and Cost ayam IPB-D1 jantan lebih tinggi dibandingkan ayam IPB-D1 betina. Terdapat perbedaan nyata pada pertambahan bobot badan., IPB-D1 chicken is a local chicken that has superior. The free-range rearing system is a maintenance model that provides access to grazing land other than cages as shelter. This study aimed to examine the performance of male and female chickens in free cages. The stages of the research included maintaining the freerange system, making feed, and observing variables, namely body weight, except for consumption, feed conversion, feed conversion, mortality, and income from feed and chicken costs. The study used 15 male chickens and 15 female chickens. IPB D1 male chickens had higher feed consumption, body weight gain, feed conversion, and mortality than female IPB D1 chickens. Body weight gain had significant differences in male and female IPB D1 chickens. The value of the over feed chick index and the cost of IPB D1 male chickens was higher than the female IPB D1 chickens.
Keyword: free-range, IPB-D1 chicken, performance, free-range, IPB-D1 chicken, performance

Judul: : Persamaan Tunggal sebagai Representasi Kurva Komposit
Abstrak: A mathematical method is introduced to represent a composite curve based on an extension of analytic geometry. The representation is given either with a single equation or with two equations, in the case of parametric representation. This method permits the representation of composite curves in similar manner to the conventional representation of non-composite curves. Some mathematical tools, including Heaviside unit step function and periodizer function, are used in the establishment of a single equation. In this paper, regular equations of regular and irregular polygon, as well as composite curves of two dimensions, are implemented using a computer algebraic system, Mathematica.
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