Sebuah studi eksperimental dilakukan untuk menilai pengaruh kualitas pakan pada produktivitas dan komposisi tubuh dari kambing Kacang. Lima belas ekor kambing Kacang jantan dengan bobot badan 14,28 ± 3,36 kg (CV = 23,55%) dibagi menjadi 5 kelompok berdasarkan bobot badan. Desain eksperimen yang digunakan dalam penelitian ini adalah Rancangan Acak Kelompok (RAK) dengan 3 perlakuan kandungan protein dan total nutrien tecerna (total digestible nutrients, TDN) yaitu T1 = pakan dengan protein 9,20% dan 54,67% TDN, T2 = ransum dengan protein 11,6% dan 58,61% TDN, T3 = ransum dengan protein 18,33% dan 65,23% TDN). Parameter yang diamati dalam penelitian ini adalah konsumsi bahan kering pakan, konsumsi protein kasar, konsumsi TDN, pertambahan bobot badan dan komposisi tubuh dari kambing Kacang. Hasil penelitian menunjukkan bahwa kualitas pakan perlakuan tidak berpengaruh nyata (P>0,05) pada konsumsi bahan kering dan komposisi tubuh, tetapi berpengaruh nyata (P<0,05) pada konsumsi protein, konsumsi TDN dan pertambahan bobot badan. Dari penelitian ini dapat disimpulkan bahwa kualitas pakan yang lebih tinggi menghasilkan produktivitas yang lebih tinggi, tetapi kualitas pakan yang lebih tinggi pada penelitian ini tidak mempengaruhi komposisi tubuh dari kambing Kacang, kecuali pertambahan lemak tubuh (%). Kata kunci : kambing Kacang, kualitas pakan, komposisi tubuh, produktivitas
Background and Aim: Grass is often scarce for ruminants during the dry season in Indonesia; thus agricultural by-products are widely used as a substitute for grass. This study aimed to determine the effect of replacing Napier grass (NG) with agricultural by-products on the productivity and carcass characteristics of lambs.
Materials and Methods: Twenty-four 3-month-old male lambs with initial body weights of 13.26±1.29 kg (coefficient of variation=9.73%) were allocated into a completely randomized design with four treatments and six replications. The treatments included: NG=100% NG; corn cobs (CCs)=50% NG and 50% CCs; bagasse (BG)=50% NG and 50% BG; and peanut shells (PSs)=50% NG and 50% PSs. All treatment diets were pelleted and consisted of 40% fibrous feed and 60% concentrate feed, and contained 10.36-11.65% crude protein and 55.47-57.31% total digestible nutrients. Parameters observed included dry matter intake (DMI), dry matter digestibility, body weight gain (BWG), feed conversion ratio (FCR), feed cost per gain (FC/G), and carcass characteristics.
Results: Lambs fed the PSs diet had the highest (p<0.05) DMI (781 g/d), digestibility, and body weight gain (92.5 g/d; p<0.05). The FCR of the PSs diet (9.13) was similar to NG. The FC/G of the PSs diet (IDR 23,541/kg) was the lowest of all diets. The BG diet had the lowest (p<0.05) digestibility, body weight gain (54.4 g/d), and the highest (13.53) FCR. No significant differences (p>0.05) were found in the carcass or meat characteristics of any diets. The averages of slaughter weight, carcass weight, and carcass percentage were 20.03 kg, 8.02 kg, and 40.0%, respectively. The average meat bone ratio was 3.67.
Conclusion: It was concluded that agricultural wastes could be used as an alternative to NG at the level of 50% in the diet of lambs without a negative effect on production performance and carcass traits.
An experimental study was carried out to evaluate the implication of early fattening of Kejobong goats by improving feeding quality on methane production and meat production. Sixteen goats (8 young and 8 mature) were raised for 4 months study period. Nested design was used in this study, with young and mature as a nest factor, and diet (G7C3: 70% grass and 30% concentrate and G3C7: 30% grass and 70% concentrate) as the treatments. The main parameters observed were DMI, BWG, carcass (CWG) and meat weight gain (MWG), and methane emission. The results showed, the young goat fed G3C7 was higher than that fed G7C3 in DMI. The BWG’s of goats fed G3C7 were higher than those fed G7C3, but there was no difference between ages in BWG. The FCR of young goat fed G3C7 was lower than that fed G7C3. The DMI of mature goat was higher than young goat, but there were no differences between the ages in DM digestibility, carcass weight and meat weight gain. The young and mature goats fed G3C7 was significantly lower than that of G7C3 in methane emissions per unit of BWG (0.28 vs 0.40 and 0.36 vs 0.53, respectively), in methane emissions per unit CWG (0.60 vs 0.93 and 0.79 vs 1.47, respectively), and methane emission per unit MWG (0.89 vs 1.42 and 1.16 vs 2.19, respectively). It can be concluded that fattening young Kejobong goats by improving feed quality is more environmentally friendly than fattening the mature ones.
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