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Cho Dok, Vietnam

Lam V.,Angiang University
Livestock Research for Rural Development | Year: 2016

Three varieties of sweet potato, Trang giay, Duyen ngoc and Hshinchu, were grown for forage production with harvests at 15 to 20 day intervals during a period of 125 days. Two kinds of fertiliser were used, chemical fertiliser (160 kg N, 60 kg P and 30 kg K per ha), and goat manure with a similar amount of N. The control treatment was without fertiliser. Dry matter (DM) yield of sweet potato vines was similar for both sources of fertilizer and was some 30% better than in the control with no fertilizer. The highest DM content was in the control treatment with no fertiliser applied and the lowest in the treatment with goat manure. The sweet potato vines fertilised with chemical fertiliser had the highest CP content. Ash content of sweet potato vines fertilised with goat manure was higher than on the two other treatments. Sweet potato for forage production should be replanted after four months and/or be given fertilizer to prolong the harvesting period. © 2016, Fundacion CIPAV. All rights reserved. Source


Giang N.T.,Angiang University | Preston T.R.,UTA | Ogle B.,Swedish University of Agricultural Sciences
Livestock Research for Rural Development | Year: 2010

Two on-farm experiments were conducted in a suburb of Long Xuyen City, An Giang province, Vietnam, to investigate the effect of diets of rice polishings with taro (Colocacia esculenta) foliage on the growth performance of common ducks. In experiment 1, 168 crossbred common ducks (crosses of an exotic and indigenous breed) were used in a completely randomized design (CRD) with 7 dietary treatments and 3 replicates. The ducks were offered chopped fresh taro leaves ad libitum, supplemented with five levels (3, 4, 5, 6, 7% of live weight [LW] as dry matter [DM]) of a basal diet (soybean meal, rice bran and broken rice) with a premix added There were two other treatments, the basal diet without premix fed at 3% of LW, with free-access to taro leaves, and the basal diet with premix, fed at the equivalent of 7% of LW, with no taro leaves provided. Each experimental unit included 8 ducks, balanced for sex. In experiment 2, in total 80 common ducks were used, with ten treatments, two replicates and four ducks (balanced for sex) per replicate. The dietary treatments were arranged as a 5*2 completely random factorial design, with ingredient ratio (5) and feeding system (2) as factors. The basal diet was high protein rice bran supplemented by five levels of taro silage (20, 30, 40, 50, and 60%), fed to the ducks in mixed or separate form. In experiment 1, the total dry matter intake was highest on the treatment in which the ducks were fed 7% of LW of the basal diet supplemented by fresh taro leaves ad libitum (110g/day), and lowest in the treatment with 3% of LW of the basal diet and taro leaves ad libitum (84.4g/day). The average daily gain among treatments was significantly different (P<0.05), and was poorest in the treatment 3% of basal diet-taro leaves ad libitum. It was concluded that fresh taro leaves can meet the duck's requirements of vitamins and minerals. In experiment 2, silage made from taro foliage (leaves and stems) was shown to replace up to 60% of the rice bran in diets for growing ducks without any reduction in growth performance and with positive effects on carcass quality (the weight of abdominal fat decreased as the taro silage intake increased). For smallholder farmers in the Mekong delta there can be significant economic benefits from the opportunity to fatten common ducks using resources (rice bran and taro foliage) that are widely available in the region and of lower cost than commercial feeds. Source


Thu Hong N.T.,Angiang University | Preston T.R.,TOSOLY
Livestock Research for Rural Development | Year: 2013

Experiments were carried out at the farm of Angiang University from January to August 2011 to measure: (i) the effect of fertilization with biodigester effluent on biomass production of Tithonia diversifolia (Wild Sunflower); and (ii) the effect on intake and digestibility by growing goats of supplementing Tithonia diversifolia foliage with foliage from Sesbania sesban and/or Mimosa pigra. Biomass productivity of Tithonia was raised by 175% by increasing the level of fertilization with biodigester effluent from 20 to 60 kg N/ha. Feed DM intake was increased by from 11 to 23% and N retention by 30-32% when goats fed a basal diet of Tithonia were supplemented with foliage from either Mimosa pigra or Sesbania sesban, or the combination of both legume foliages. Source


Hang B.P.T.,Angiang University | Lam V.,Angiang University
Livestock Research for Rural Development | Year: 2016

A study was conducted at Hoaan Farming System Research Station of Cantho University, Haugiang province, Vietnam from May to November 2004 to estimate the biomass production of naturally growing Melastoma affine, D. Don in the acid sulphate soil area. Five Melastoma shrubs of 4 different height classes (<1.0 m; 1.0-1.9 m; 2.0-2.9 m and (>2.9 m) were cut at 15-20 cm above ground. The edible foliage (leaves+petioles+40cm of stem) and woody stems were harvested and weighed to measure the total biomass yields from shrubs of different heights and proportion of edible foliage. Number of shoots and sub-shoots, average height of the shoots and sub-shoots were counted and measured once per month each individual plant to measure the ability of re-growth. No Melastoma shrub higher than 2.9 m was found in the fields. The highest percentage of edible DM yield was from Melastoma below 2.0 m. Shrubs higher than 2.0 m were more suitable for fuel wood. After cutting, the number of shoots and sub-shoots was higher than the number of stumps and grew well. Twenty sub-plots (5m*5m) were also randomly selected and marked within 4 main plots (20m*20m) (5 sub-plots per main plot) for estimating biomass production per hectare in an area dominated by Melastoma. The total fresh biomass yield per ha was about 37.2 tons. The biomass of edible foliage was 1.5 times higher than the biomass of woody stems. The results showed that the height of naturally growing Melastoma strongly influenced the yield of edible foliage and woody stems. © 2016, Fundacion CIPAV. All rights reserved. Source


Hang B.P.T.,Angiang University | Lam V.,Angiang University | Preston T.R.,Centro Para La Investigacion En Sistemas Sostenibles Of Produccion Agropecuaria Cipav
Livestock Research for Rural Development | Year: 2016

An experiment was conducted in order to compare the effect of the dimensions of plastic biodigesters (width:length ratio) on gas production and composition of effluent. The experiment had three treatments consisting of different dimensions of plastic biodigester: 2, 3 and 5 m length and 64 cm diameter. Fresh cow manure at a loading rate of 4 kg DM/m3 of liquid capacity was charged daily into each biodigester. The manure was mixed with 11.4, 17.1 and 28.5 litres of water in biodigesters 2, 3, and 5 m long, respectively, to give a retention time of 20 days. Biogas production was measured daily by water displacement in inverted light-weight containers suspended in 200 litre drums filled with water. Gas production progressively increased with time in all three biodigesters and after 30 days was 55% of the liquid volume for the 5m biodigester compared with 33% for the 2 and 3m biodigesters. There was no apparent effect of biodigester dimension on chemical characteristics of the effluent, with overall means of 3.59% for DM, 77.4% for organic matter in DM, 6.59 for pH and 967 mg N/litre, respectively. Ammonia content in the effluent was on average 391 mg/litre, accounting for 41.1% of total N. It is concluded that a length:diameter ratio of 5:0.65 is better than ratios of 2:0.65 or 3:0.65 for the construction of plug flow tubular plastic biodigesters. © 2016, Fundacion CIPAV. All rights reserved. Source

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