Pengaruh Model Pembelajaran Inkuiri Berbantuan Laboratorium Virtual Terhadap Penguasaan Konsep Fisika Peserta Didik

This study aims to determine the effect model of inquiry aided virtual laboratory to physical concept comprehension of students MA DI Putri Nurul Hakim Kediri the academic year 2015/2016. Experimental research design using "pre-test-post-test control group design". The population in this study were all students of class X MA DI Putri Nurul Hakim Kediri totaling 5 classes, while samples were students of class X.1 as an eksperiment class majoring in X.2 as a control class. The data collection concept comprehension using techniques shaped test multiple choice. The research hypotheses were tested by t-test polled variance variance with significance level of 5% that is a hypothesis which does not indicate a specific direction. The results showed that physical concept comprehension ability of students learning with virtual media-aided model of inquiry higher than those not using the model inquiry-aided virtual laboratory

The Change of Body Composition of Indigenous Rams on Different Body Weight and Feeding Level

The aim of this research was to investigate the influence of body weight and feeding level on the changeof body composition of indigenous ram. This research was expected to establish the efficient feeding levelto produce high growth rate and meat quality of ram in tropical environment. Sixteen rams with differentbody weight (BW) were divided into 2 groups, i.e. light BW (10 + 1.47 kg) and heavy BW (18 + 1.18 kg).The experimental design was Split Plot design with two factors. The main plot was body weight (light andheavy) and the sub plot was level of feeding (FL, 1x maintenance and 1.5 x maintenance). The parametersmeasured in this experiment were live weight gain and body composition. The results of this study showedthat body water, body protein and body fat were significantly higher (P<0.01) in heavy body weight (HBW)than those in light body weight (LBW), and was higher in 1.5xM than those 1xM. Ram of HW and LW hadsimilar change rate of physical composition. Ram given 1.5xM had higher rate of change of body fat andbody water than those given feed at maintenance level. It can be concluded that there was no interactionbetween BW and FL on the change of body water, body protein and body fat. Ram of HBW and LBW hadsimilar rate of change of physical composition. Level of feeding affected body water content, the higherlevel of feeding resulted in fatter ram, leading to less body water content

Potensi Cemaran Nitrogen ke Udara dari Feses Sapi Potong dengan Level Protein Intake yang Berbeda

Penelitian ini dilakukan untuk mengetahui potensi cemaran N yang berasal dari sapi potong. Materi yang digunakan adalah 16 ekor sapi yang terdiri dari sapi Madura, sapi Peranakan Ongole (PO) dan sapi Peranakan Limousin (PL) berjenis kelamin jantan, dengan bobot badan rata-rata 201,20 ± 46,34 kg. Feses dikoleksi selama satu minggu dan kadar nitrogen diukur dengan metode Kjeldahl; cemaran N ke udara dihitung selisih kadar N di feses segar dan kering. Hasil penelitian ini menunjukkan bahwa cemaran N berhubungan erat dengan kualitas pakan dan protein intake. Semakin tinggi protein intake, maka N feses yang hilang ke udara akan semakin tinggi. Hal tersebut dapat dihitung dengan memasukan ke dalam persamaan y = 0,0568x + 0,0051 (y= N feses volatil dan x = % protein pakan). Produksi N yang dihasilkan sapi di Indonesia adalah 8,7 gN per kg feses (dalam 100% BK). Dengan menggunakan angka tersebut, potensi kontaminasi N yang dihasilkan oleh sapi potong di Indonesia adalah 9,09 gN per ekor atau dapat diperhitungkan sekitar 71,2 ton N per tahun yang dikonversikan menjadi amonia adalah 66,3 mt per tahun (untuk populasi 16,6 juta ekor)

Pemanfaatan Protein pada Domba Lokal Jantan dengan Bobot Badan dan Aras Pemberian Pakan yang Berbeda

ABSTRAK Penelitian bertujuan untuk mengkaji perbedaan pemanfaatan protein pada domba lokal jantan dengan bobot badan dan aras pemberian pakan yang berbeda. Penelitian dilaksanakan di Laboratorium Ternak Potong dan Kerja, Fakultas Peternakan, Universitas Diponegoro dari bulan Agustus hingga November 2009. Enam belas ekor domba lokal jantan yang terdiri dari 8 ekor dengan bobot badan (BB) rendah 10 ± 3,4 kg (CV = 8,89%), berumur 5-6 bulan, dan 8 ekor dengan BB tinggi 18 ± 3,8 kg (CV = 7,13%), berumur 9-12 bulan digunakan dalam penelitian ini. Penelitian dilakukan dengan menggunakan rancangan petak terbagi RAL dengan 4 ulangan. Pakan diberikan dalam bentuk complete feed sebanyak 2,4% dari BB untuk hidup pokok (HP) dan 3,6% untuk 1,5 kali hidup pokok (1,5HP). Pakan mengandung 92,11% BK; 12,9% protein kasar (PK); 1,86% LK; 22,48% SK; 42,13% BETN dan 14,66 kJ/g. Kebutuhan HP didapatkan dari pemeliharaan ternak tanpa pertambahan bobot badan selama periode adaptasi. Parameter yang diamati adalah konsumsi pakan, pemanfaatan konsumsi PK, kecernaan PK, retensi PK, nilai biologis protein (NBP), konsentrasi NH3 rumen dan urea darah serta produksi mikroba rumen. Hasil penelitian menunjukkan bahwa Kecernaan BK (%) tidak berbeda antara BB dan antar aras pemberian pakan (P>0,05), yaitu berkisar antara 50,03-51,41%. Kecernaan PK tidak berbeda antara BB dan aras pemberian pakan (P>0,05) dengan kisaran nilai 63,91-69,09%. PK termetabolis pada aras pemberian pakan 1,5xHP (17,61g/hr) nilainya lebih tinggi daripada 1xHP (8,31 g/hari) (P<0,05) namun tidak ada perbedaan yang nyata berdasarkan perbedaaan bobot badan. Tidak ada perbedaan nilai retensi PK dan NBP (P>0,05). Kisaran nilai retensi PK adalah 15,51%-24,22% dan NBP berkisar 24,11%-34,80%. Konsentrasi NH3 tidak berbeda antar BB dan antar aras pemberian pakan (P>0,05), yaitu pada jam ke 0 sebesar 140mgN/l dan pada 3 jam setelah pemberian pakan sebesar 147,5mgN/l. Konsentrasi urea darah pada 0 jam (4,51-4,78 mg/l), 3 jam (4,48-4,60 mg/l) dan 6 jam (4,40-4,89 mg/l) setelah pemberian pakan tidak berbeda antar BB dan antar aras pemberian pakan (P>0,05). Tidak terjadi perbedaan akibat perbedaan bobot badan dan aras pemberian pakan terhadap produksi nitrogen mikrobia (P>0,05). Berdasarkan hasil penelitian dapat disimpulkan bahwa pemanfaatan protein pada domba lokal jantan dengan bobot badan dan level pemberian pakan yang berbeda tidak berbeda. Kata kunci: pemanfaatan protein,domba lokal jantan,bobot badan, aras pakan Dietary Protein Utilisation by Indigenous Rams with Various Body Weight and Level of Feeding G. Mahesti, J. Achmadi and E. Rianto Master of Animal Science, Diponegoro University, Semarang ABSTRACK The objective of this experiment was to study dietary protein utilisation by rams with various body weight and level of feeding. This experiment was carried out at Laboratory of Meat and Drought Animal Science, Faculty of Animal Agriculture, Diponegoro University, from August to November 2007. Sixteen rams, consisting of 8 rams with average body weight (BW) of 10 ± 3.4 kg (CV = 8.89 %), 5-6 months old for light BW group, and 8 rams with average BW of 18 ± 3.8 kg (CV = 7.13%), 9-12 months for heavy BW group were used in this experiment. This experiment used splitplot design with 4 replications. The diet given contained 92.11% dry matter; 12.9% crude protein; 1.86% ethyl ether; 22.48% crude fibre; 42.13% nitrogen free extract and 14.66 kJ/g energy. It was offered as complete feed at 2.4% of BW for maintenance (1xM) and 3.6% of BW for 1.5 maintenance (1.5xM) feeding level. The 1xM feeding determined by maintaining the animals at zero body weight gain. The experimental variables measured were feed intake, protein utilisation, rumen NH3 concentration, blood urea concentration and microbial protein production. The results showed that dry matter digestibility (%) was not different between body weights (BW) and between feeding levels (P>0.05), ranged between 50.03 and 51.41%. Protein digestibility was not different between BWs and feeding levels (P>0.05), ranged between 63.91 and 69.09%. Metabolisable protein intake in 1.5xM (17.61 g/day) was higher than that in 1xM (8.31 g/day) (P<0.05), but there was no difference between BWs. There was no difference in protein utilisation which was represented by protein retention and biological value (NBV) (P>0.05). Protein retention ranged from 15.51 to 24.22% and NBV ranged from 24.11 to 34.80%. Concentration of NH3 was not different between BWs and between feeding levels (P>0.05). Rumen NH3 concentration at 0 hour before feeding is 140 mgN/l and at 3 hours after feeding was 147.5 mgN/l. Blood urea concentration at 0 (4.51–4.78 mg/l), at 3 (4.48–4.60 mg/l) and 6 hours (4.40–4.89 mg/l) after feeding was not different between BWs and between feeding levels (P>0.05). There was no difference between BWs and between feeding levels in microbial protein production (P>0.05). Based on results, it can be concluded that dietary protein utilisation in indigenous rams with different BW and feeding level was not different. Keywords : dietary protein utilsation, indigenous ram, body weight, level of feedin

THE CHANGE OF BODY COMPOSITION OF INDIGENOUS RAMS ON DIFFERENT BODY WEIGHT AND FEEDING LEVEL

The aim of this research was to investigate the influence of body weight and feeding level on the change of body composition of indigenous ram. This research was expected to establish the efficient feeding level to produce high growth rate and meat quality of ram in tropical environment. Sixteen rams with different body weight (BW) were divided into 2 groups, i.e. light BW (10 + 1.47 kg) and heavy BW (18 + 1.18 kg). The experimental design was Split Plot design with two factors. The main plot was body weight (light and heavy) and the sub plot was level of feeding (FL, 1x maintenance and 1.5 x maintenance). The parameters measured in this experiment were live weight gain and body composition. The results of this study showed that body water, body protein and body fat were significantly higher (P<0.01) in heavy body weight (HBW) than those in light body weight (LBW), and was higher in 1.5xM than those 1xM. Ram of HW and LW had similar change rate of physical composition. Ram given 1.5xM had higher rate of change of body fat and body water than those given feed at maintenance level. It can be concluded that there was no interaction between BW and FL on the change of body water, body protein and body fat. Ram of HBW and LBW had similar rate of change of physical composition. Level of feeding affected body water content, the higher level of feeding resulted in fatter ram, leading to less body water content. Keywords: Body Weight, Feeding Level, Maintenance, Body Compositio

THE CHANGE OF BODY COMPOSITION OF INDIGENOUS RAMS ON DIFFERENT BODY WEIGHT AND FEEDING LEVEL

The aim of this research was to investigate the influence of body weight and feeding level on the changeof body composition of indigenous ram. This research was expected to establish the efficient feeding levelto produce high growth rate and meat quality of ram in tropical environment. Sixteen rams with differentbody weight (BW) were divided into 2 groups, i.e. light BW (10 + 1.47 kg) and heavy BW (18 + 1.18 kg).The experimental design was Split Plot design with two factors. The main plot was body weight (light andheavy) and the sub plot was level of feeding (FL, 1x maintenance and 1.5 x maintenance). The parametersmeasured in this experiment were live weight gain and body composition. The results of this study showedthat body water, body protein and body fat were significantly higher (P&lt;0.01) in heavy body weight (HBW)than those in light body weight (LBW), and was higher in 1.5xM than those 1xM. Ram of HW and LW hadsimilar change rate of physical composition. Ram given 1.5xM had higher rate of change of body fat andbody water than those given feed at maintenance level. It can be concluded that there was no interactionbetween BW and FL on the change of body water, body protein and body fat. Ram of HBW and LBW hadsimilar rate of change of physical composition. Level of feeding affected body water content, the higherlevel of feeding resulted in fatter ram, leading to less body water content