Judul: Peranan bakteri probiotik pada performa produksi dan kualitas telur yang diinfeksi Salmonella enteritidi
Abstrak: The Salmonella disease is mostly found in laying hens that effect on egg production and increased mortality. Prevention of Salmonella infection can be conducted with probiotics. Probiotics are non pathogenic microbes which when ingested produces a positive effect on the health and physiology of the host that stimulates the immune system. This study aimed to determine the role of probiotic bacteria on the production performance and egg quality of laying hens that infected by Salmonella enteritidis transovarian. This research was conducted in the poultry cages, poultry unit of the Faculty of Animal Science, Bogor Agricultural University in September to October 2010. 60 head of laying hens were used for four treatments and three replications with each replication of five heads. The first treatment (P1), the control treatment, a second treatment (P2), hens were infected with S. enteritidis. Treatment three (P3), hens were infected with S. enteritidis and given probiotics once. Treatment fourth (P4), hens were infected with S. enteritidis and given probiotics twice. Feed intake, feed conversion, hen-day egg production, egg weight, Haugh unit, albumen weight, yolk weight and egg shell weight were observed. Research using completely randomized design (CRD) and the T test to see the effect of treatment. Feed consumption and percentage of hen day egg production were not difference between treatment P1 and P3, giving probiotics in animals which was infected with S. enteritidis help the healing process. P2 treatment increased feed consumption due to infection S. enteritidis resulted in efforts to recovery condition of laying hens. P4 treatment, feed intake and hen day egg production were not different from the P2 because of infection S. enteritidis and given probiotics twice can accelerate recovery of laying hens conditions. Lactic acid probiotic can increase the productivity of laying hens by recovery of laying hens form attacking of S. enteritidis
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Judul: Isolation of Salmonella spp in the Ovaries and Eggs from Laying Hens is Given Lactobacillus acidophilus Probiotic
Abstrak: Salmonellosis adalah penyakit yang disebabkan oleh infeksi Salmonella yang termasuk dalam foodborne disease. Meningkatnya kasus Salmonellosis pada manusia terjadi karena mengkonsumsi daging, telur, dan hasil olahannya yang terkontaminasi oleh Salmonella. Salmonella spp banyak ditemukan pada ternak ayam dan dapat mengakibatkan kontaminasi produk ayam (khususnya telur) secara vertikal maupun horizontal. Bakteri ini harus dihindari keberadaannya di telur ayam. Salah satu alternatif pencegahan Salmonella spp pada ayam petelur adalah dengan penggunaan probiotik. Bakteri asam laktat yang dapat digunakan sebagai agen probiotik adalah L. acidophilus yang mempunyai aktifitas antimikroba terhadap Salmonella spp. Penelitian ini terdiri dari empat perlakuan yang terdiri atas kontrol, perlakuan pemberian Salmonella spp, perlakuan pemberian Salmonella spp dan L. acidophilus sebanyak 1 kali pemberian dan perlakuan pemberian Salmonella spp dan probiotik L. acidophilus sebanyak 2 kali pemberian. Pemberian L. acidophilus diberikan selama 20 hari pemeliharaan dan infeksi Salmonella spp selama 5 hari di pertengahan pemeliharaan. Kemudian dilakukan pengambilan sampel pada ayam ras petelur berupa ovarium dan telur yang sudah ditetaskan dan dilakukan isolasi Salmonella spp dengan metode Bacteriological Analitycal Method (BAM) meliputi tahapan proses pengkayaan, agar selektif, hingga uji biokimia awal. Rancangan yang digunakan dalam penelitian ini adalah Rancangan Acak Kelompok, memiliki 3 ulangan di masing-masing perlakuannya dan kelompok waktu pengambilan data yang berbeda. Data yang diperoleh dianalisis secara deskriptif. Hasil penelitian menunjukkan bahwa dengan pemberian probiotik L. acidophilus satu atau dua kali pemberian selama 20 hari pemeliharaan dengan dosis 109cfu/ml/ekor/hari efektif dalam menurunkan keberadaan bakteri patogen Salmonella spp. Hal tersebut dibuktikan tidak ditemukannya Salmonella spp pada telur perlakuan ketiga dan keempat di hari pengamatan ke 20. Probiotik L. acidophilus layak digunakan sebagai bahan tambahan pakan pada ayam ras petelur guna keamanan produk hasil peternakan khususnya telur.
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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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