One of the obstacles faced by the broiler farmer breeders is the high price of feed, which can cause low profits obtained in the broiler chicken farming businesses. An alternative is to use fermented Lamtoro (Leucaena leucocephala) leaf flour. The purpose of this study was to examine the effect of partial replacement of a commercial ration with fermented Lamtoro leaf flour. This study was carried out according to a completely randomized design with five treatments and four replications for each treatment, in which each experimental unit consisted of five-day-old chicks. The treatments were L0 (100% commercial feed), L1 (95% commercial feed + 5% fermented Lamtoro leaf flour), L2 (90% commercial feed + 10% fermented Lamtoro leaf flour), L3 (85% commercial feed + 15% fermented Lamtoro leaf flour), and L4 (80% commercial feed + 20% fermented Lamtoro leaf flour). The results showed that the substitution of the commercial rations up to the level of 20% had no significant effects (P>0.05) on all parameters tested (final body weight, carcass weight, carcass percentage, and percentage of chest, thigh, or back). From this study, it can be concluded that fermented Lamtoro leaf flour can replace the use of the commercial ration of broiler up to 20%.

This study aimed to determine the effect of arbuscular mycorrhizal fungi (AMF) and phosphate (P) fertilizer on the nutrient content, phosphate uptake and in vitro digestibility of alfalfa (Medicago sativa L.).The research was conducted at green house of Forage and Pastures Science Laboratory, Faculty of Animal Science Universitas Gadjah Mada. The experiment was arranged in Completely Randomized Design using 3x4 factorial patterns with four replications. The first factor was dosage of phosphate fertilizer SP 36 (0, 60, and 120 kg/ha). Second factor was the dosage of AMF (0, 0.8, 1.6, and 2.4kg/ha). The variable measured was nutrient contents (crude protein, dry matter, and organic matter), total P uptake and dry matter and organic matter in vitro digestibility. The results showed that the interaction of AMF and P fertilizer had no significant effect on crude protein and total P uptake, but highly significant effect on the parameters of dry matter, organic matter and dry matter and organic matter in vitro digestibility.

Abstract. Putra B, Warly L, Evitayani, Utama BP. 2021. The role of arbuscular mycorrhizal fungi in phytoremediation of heavy metals and their effect on the growth of Pennisetum purpureum cv. Mott on gold mine tailings in Muara Bungo, Jambi, Indonesia. Biodiversitas 23: 478-485. The increase of heavy metal pollution in the soil results from human activities such as gold mining, which impacts human and environmental health problems. Phytoremediation is an environmentally friendly, inexpensive, and efficient solution to overcome environmental damage caused by heavy metal contamination. Inoculation of AMF in dwarf Napier grass can reduce the level of metal contaminants in soil and subsequently its absorption in plant tissue. This study investigates the effect of arbuscular mycorrhizal fungi (AMF) on dwarf Napier grass (Pennisetum purpureum cv. Mott) plant growth and heavy metal remediation rates. The experiment was a completely randomized design with 4 levels of AMF inoculation (0, 5, 10, and 15 g/pot) with 5 repetitions. After eight weeks of potting experiments, shoot and root biomass, plant growth, heavy metal content in potting media were assessed. The results revealed that AMF inoculation of 10 g/pot exhibited a higher growth yield of dwarf Napier grass compared to other treatments (plant height (p<0.01), leaf length (P<0.01), leaf width (P<0.01), stem diameter (P<0.01) and plant fresh weight (P<0.01)), but had no significant effect on the number of leaves and number of shoots (P>0.05). AMF (10 g/pot) significantly affected root growth of dwarf Napier grass (root length (P<0.01), number of roots (P<0.05), and root fresh weight (P<0.01)). The results also showed that AMF increased the uptake of Al, Co, Cr, and Fe significantly in the growing media (Al (P<0.01), Co (P<0.05), Cr (P<0.01), Fe (P<0.05) but no significant effect on Pb (P>0.05). This study concluded that AMF effectively increased the growth of dwarf Napier grass and reduced heavy metal contaminants on gold mines tailings.

Pakan substitusi sebagian ransum komersil dengan menggunakan indigofera sp adalah alternatif untuk memcahkan masalah mahalnya harga pakan broiler. indigofera sp memiliki keunggulan kandungan protein yang tinggi serta mudah untuk didapatkan. Penelitian ini dilaksanakan dengan tujuan untuk mengetahui pengaruh substitusi sebagian ransum komersil dengan menggunakan tepung Indigifera sp terhadap lemak abdomen ayam broiler. Penelitian ini dilaksanakan dengan metode rancangan acak lengkap dengan  5 perlakuan dan 4 ulangan, dengan rincian; perlakuan I0 (100% ransum komersil), I1 (92% komersil + 16% Indigofera sp, I3 (76% ransum komersil + 24% Indigofera sp), dan I4 (68% ransum komersil + 32% Indigofera sp).  Hasil penelitian menunjukkan bahwa penggunaan Indigofera sp sebagai substitusi sebagian pakan komersil berbeda tidak nyata (P>0,05) terhadap semua parameter yang diteliti, yakni lemak abdomen, persentase lemak abdomen terhadap bobot hidup, persentase lemak abdomen terhadap karkas, persentase lemak abdomen terhadap organ dalam ayam broiler. Kesimpulan penelitian ini adalah penggunaan Indigofera sp hingga level 32% tidak mempengaruhi lemak abdomen ayam broiler.   Kata Kunci : Indigofera sp, abdomen, broiler

Mercury composite and cyanidation are gold mining methods that are frequently used. The mercury composite method produces tailings containing heavy metals that can harm living organisms. Utilisation of tailings for the development of forage may be enhanced through arbuscular mycorrhizal fungi (AMF) inoculation to increase plant resistance, absorption of macro and micronutrients, and reduce levels of metal contaminants in the tailings. This study aimed to investigate the effect of arbuscular mycorrhizal fungi on nutrients and heavy metals uptake by <em>Pennisetum purpureum</em> cv Mott in phytoremediation of gold mine tailings. Treatments consisted of four levels of AMF inoculation (0, 5, 10 and 15 g pot^-1) were arranged in a completely randomised design with five replications. Each pot contained 3 kg of tailings. The results showed that the best crude protein, crude fiber, crude fat, Ca, and P contents in the plant shoots was obtained by providing AMF inoculation of 15 g pot^-1. However, the treatment had no significant effect on dry weight, dry matter, and nitrogen-free extract. AMF significantly increased the uptake of heavy metals by the plant roots. The treatments did not significantly affect Pb uptake by plant roots and shoots and Hg uptake by plant shoots. AMF treatments significantly reduced the translocation factor (TF) value for Hg, bioconcentration factor (BCF) values for Cd and Pb, and removal efficiency (RE) values for Cd and Pb. AMF could effectively increase nutrient absorption in the plant shoots, reduce Cd, Hg, and Pb translocation in plant shoots, and reduce Cd, Hg, and Pb in the tailings.