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Triet N.M.,Nong Lam University | Khang D.N.,Nong Lam University | Preston T.R.,Centro Para La Investigacion En Sistemas Sostenibles Of Produccion Agropecuaria Cipav
Livestock Research for Rural Development | Year: 2016

The study aimed to measure gas yield, methane content of the gas and substrate pH in experimental biodigesters designed according to the “plug-flow” and “dome” configuration. The biodigesters were made from recycled “pet” plastic water bottles of 5 liter capacity. The liquid volume was set at 4 liters with a hydraulic retention time of 20 days. The influent (200 ml day-1) was fresh manure, from growing cattle fed Elephant grass (Pennisetum purpurreum) and concentrates, mixed with water to give 4% total solids. The experiment lasted 20 days. On average the gas production was 54% greater in the “plug-flow” configuration than in the “dome” configuration. The percentage of methane in the gas increased linearly over the first 14 days of the incubation with higher values for the “plug-flow” than the “dome” configuration. After 14 days the concentration of methane stabilized at slightly over 50% with no differences between the two configurations. pH values were similar in the two configurations, falling from an initial value of 7.0 to 5.5 over the first 5 days, then stabilizing at 7.0 for the rest of the 20 day test period. Overall, mainly because of the greater daily gas production, the production of methane was 78% greater for the “plug-flow” than for the “dome” configuration. © 2016, Fundacion CIPAV. All rights reserved. Source


Silivong P.,Souphanouvong University | Preston T.R.,Centro Para La Investigacion En Sistemas Sostenibles Of Produccion Agropecuaria Cipav
Livestock Research for Rural Development | Year: 2016

The objective of the study was to determine the effect of water spinach and biochar on feed intake, digestibility, N retention and growth performance of local goats fed Bauhinia acuminata as basal diet. Ground sun-dried cassava root was included at 5% (as DM) of all the diets to serve as a carrier for the biochar The experiment was arranged as a 2*2 factorial with 3 replications using twelve goats in individual pens (initial body live-weight 12.5kg and 5-6 months of age). Daily live weight gain and feed conversion, apparent digestibility of DM, OM, crude protein, and N retention, were improved by supplements of water spinach and biochar. The higher values of rumen ammonia in goats fed water spinach reflected the greater solubility of the crude protein (CP) in the water spinach compared with that in the basal diet of Bauhinia) This could be the explanation for the better animal response with this supplement. © 2016, Fundacion CIPAV. All rights reserved. Source


Manivanh N.,Souphanouvong University | Preston T.R.,Centro Para La Investigacion En Sistemas Sostenibles Of Produccion Agropecuaria Cipav
Livestock Research for Rural Development | Year: 2016

A growth trial was conducted with 12 local pigs (Moo Lat breed) with average 14.8 kg initial live weight in a randomized complete block design (RCBD), with three replications of four treatments. The aim of the study was to determine the effect of replacing ensiled taro foliage with protein-enriched cassava root in a basal diet of ensiled banana stem. Fermentation of fresh cassava root with yeast, urea and di-ammonium phosphate (DAP) increased the content of true protein in the root from 2.5 to 14.2% in DM. There were positive responses in dry matter (DM) intake, live weight gain, feed conversion ratio, apparent DM digestibility and N retention as the percentage of protein-enriched cassava root in the diet was increased. © 2016, Fundacion CIPAV. All rights reserved. Source


Silivong P.,Souphanouvong University | Preston T.R.,Centro Para La Investigacion En Sistemas Sostenibles Of Produccion Agropecuaria Cipav
Livestock Research for Rural Development | Year: 2015

The aim of the study was to determine the effect of water spinach and biochar on enteric methane emissions, feed intake, digestibility, nitrogen retention and growth performance in local goats fed Bauhinia acuminata and molasses as basal diet. The experiment was arranged as a 2*2 factorial with 4 replications using sixteen goats in individual pens (initial live weight 12.9 kg and 6-7 months of age). Daily live weight gain and feed conversion, and DM digestibility and N retention, were improved by feeding water spinach and by supplementation with biochar. The higher value of rumen ammonia in goats fed water spinach reflected the greater solubility of the crude protein in the water spinach. Supplementation with water spinach led to a reduction in the methane/carbon dioxide ratio in the eructed breath of the goats but this criterion was not affected by biochar. © iForest – Biogeosciences and Forestry. Source


Silivong P.,Souphanouvong University | Preston T.R.,Centro Para La Investigacion En Sistemas Sostenibles Of Produccion Agropecuaria Cipav
Livestock Research for Rural Development | Year: 2015

The objective of this study was to determine the effect of water spinach as source of soluble protein, and of biochar as support for biofilms, on methane production in an in vitro incubation system using leaves of Bauhinia acuminata and Azadirachta indica as the substrate. For each source of leaves, the experimental design was a 2*2 factorial arrangement of 4 treatments with four replications. Measurements were made of total gas, percent methane in the gas and DM and N solubilized, at intervals of 6, 12, 18 and 24h. Gas production and percent substrate solubilized were increased by water spinach on both Bauhinia and Bitter Neem. By contrast, water spinach did not affect methane production on Bauhinia but increased it on Bitter Neem. Biochar supplementation had no effect on total gas and methane production. © iForest – Biogeosciences and Forestry. Source

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