Natural, Vietnam
Natural, Vietnam

Time filter

Source Type

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.


Tien D.T.M.,Angiang University | Tran N.T.B.,Angiang University | Hang B.P.T.,Angiang University | Preston T.R.,Finca Ecologica
Livestock Research for Rural Development | Year: 2013

The aim of this experiment was to evaluate the effect of the ensiled mixture of banana stem and taro foliage as a partial replacement of rice bran in the diet of growing common ducks. The design was a completely randomized arrangement of five treatments and three replicates. The treatments were based on percentages of silage of banana stem and taro foliage (50:50, DM basis) replacing rice bran in the diet (0, 20, 30, 40 and 50% as DM). The average crude protein content of the diets was in the range of 11 to 13% in DM. DM intake decreased and DM feed conversion was improved when the banana stem-taro silage replaced rice bran. Live weight gain increased with a curvilinear trend with the optimum (13 g/day) between 30 and 40% banana stem-taro silage in the diet.


Hang B.P.T.,Angiang University | Lam V.,Angiang University | Preston T.R.,Finca Ecologica
Livestock Research for Rural Development | Year: 2013

Weaned crossbred rabbits (n=30) were allocated to a 2*5 factorial design, to compare: (i) water spinach (WS) as the only foliage, or offered at 50% of observed intake in treatment WS with ad libitum water hyacinth leaves (WHL); and (ii) levels of paddy rice (PR) of 0, 5, 10, 20 or 35 g/day. There were linear increases in growth rate on WS and WHL treatments as the offer level of paddy rice was increased up to 20 g/day, with no further increase at the 35 g/day level. At all levels of paddy rice the growth rates on water spinach as the sole forage were almost double those when the water spinach was restricted and water hyacinth leaves were fed ad libitum. There were improvements in feed conversion as the level of paddy rice was increased, and poorer results when water hyacinth leaves replaced 50% of the water spinach.


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.


Hang B.P.T.,Angiang University | Lam V.,Angiang University | Phuong T.T.B.,Angiang University | Preston T.R.,TOSOLY
Livestock Research for Rural Development | Year: 2011

Water hyacinth (Eichhornia crassipes) infestation of water surfaces is usually thought to be a problem. On the other hand, its capacity to remove nutrients from polluted water is an asset. Developing ways to use economically the foliage of water hyacinth is therefore an important goal for researchers. The present study aimed to investigate if supplementation with other foliages would improve the utilization of water hyacinth by growing goats. Two experiments were conducted in the Angiang University Research Farm. The digestibility study was a 4*4 Latin-square design with Sesbania sesban at levels of 1 or 2% of LW (DM basis) in basal diets of water hyacinth leaves or leaves + stems. The growth study was a Complete Randomized Design with the water hyacinth leaves ad libitum supplemented with either Sesbania sesban, water spinach, natural grass or sweet potato vines (all at 1% of LW on DM basis).Feed intake and N retention were higher when water hyacinth leaves were the basal diet rather than leaves + stems. Growth rates were higher when Sesbania sesban, water spinach or sweet potato vines, rather than grass, were used to supplement the water hyacinth leaves.


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.


Tam N.H.,Angiang University | Hang B.P.T.,Angiang University | Lam V.,Angiang University | Preston T.R.,TOSOLY
Livestock Research for Rural Development | Year: 2013

Thirty- two weaned crossbred rabbits were used in a study to identify the components in paddy rice that supported best growth rates when fed as supplements to either Operculina turpethum alone or combined with water spinach. The design was a 2*4 factorial arrangement with 4 replications. The factors were: (i) Operculina turpethum (OT) alone or mixed 50:50 with water spinach (OW); (ii) components of paddy rice (paddy rice, rice grain+bran, rice grain+bran+husk, rice grain) at levels (g/day) of: 20, 14+2, 14+2+4 and 14, respectively. The study lasted 8 weeks. When the rabbits had access to rice bran, as well as rice grain, growth rates were improved compared with rice grain fed as the only supplement, and were similar to the results with paddy rice. Growth rates were improved when water spinach replaced 50% of the Operculina foliage; however, the relative effects of the rice supplements were similar for both sources of foliage. These results indicate that it is the bran in the paddy rice that explains the better growth rate on paddy rice compared with rice grain. The fact that the rabbits did not eat the husk when it was offered as a separate feed, shows that it plays no positive role in a diet composed mainly of water spinach.


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.


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.


Hong N.T.T.,Angiang University | Lam N.T.,Angiang University
Livestock Research for Rural Development | Year: 2011

The experiment was conducted on a farm in Tam Nong district, Dong Thap province to evaluate the feeding value of Mimosa pigra for goats. Sixteen growing male goats (16+3 kg live weight) were allocated to 4 treatments in a 2*2 factorial arrangement with 4 replications. The treatments were foliage of Mimosa fed fresh (MF) or wilted (MW); and with a supplement of water spinach (WS) or no supplement (NWS). The Mimosa foliage was offered ad libitum; water spinach was fed at 30 g/kg live weight (fresh basis). The trial lasted 110 days. Growth rates were increased by feeding the fresh rather than wilted Mimosa (103 vs 91.7 g/day), and by supplementation with water spinach (102 vs 92.3 g/day) (SEM±4.7). Feed intake and apparent digestibility coefficients for dry matter and crude protein showed the same tendency as growth rates. For the MFS and MWS treatments, water spinach represented 27% of the total DM intake.

Loading Angiang University collaborators
Loading Angiang University collaborators