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  1. Article ; Online: Effects of Stocking Density in Group Cages on Egg Production, Profitability, and Aggressive Pecking of Hens

    Hanh, Han Quang / Phuong, Nguyen Thi / Tien, Nguyen Dinh / Nhung, Dang Thuy / Lebailly, Philippe / Ton, Vu Dinh

    Journal of Applied Animal Welfare Science. 2023 July 03, v. 26, no. 3 p.374-385

    2023  

    Abstract: There is an increasing concern about welfare issues related to battery cages, which are commonly used in Vietnam, and requires a modified cage that improves hen welfare while retaining its economic and management advantages. We combined adjacent ... ...

    Abstract There is an increasing concern about welfare issues related to battery cages, which are commonly used in Vietnam, and requires a modified cage that improves hen welfare while retaining its economic and management advantages. We combined adjacent conventional cages to form group cages to examine the effects of stocking density on egg production, economic returns, and aggressive pecking of hens. The control group included triplicate conventional cages with four birds/single cage (12 hens per three cages) or 450 cm² area per hen. Three group cage treatments were set up with 10, 12, and 14 birds per group cage or 540, 450, and 386 cm² of floor area per hen, respectively. Compared to 14 birds per cage, hens housed at 10 birds per group cage had a higher hen-day production, consumed less feed, and thus had a better feed conversion ratio/dozen eggs. Reducing the stocking density to 10 birds per group cage resulted in additional production cost, but it was compensated for by a high egg income, and significantly decreased aggressive pecks. Group cages benefit hen performance, profitability, and welfare when decreasing the stocking density to 10 birds per cage with 540 cm²/hen.
    Keywords animal welfare ; batteries ; cages ; egg production ; eggs ; feed conversion ; hens ; income ; profitability ; Vietnam ; Cage density ; feather pecking ; modified cage
    Language English
    Dates of publication 2023-0703
    Size p. 374-385.
    Publishing place Taylor & Francis
    Document type Article ; Online
    ISSN 1532-7604
    DOI 10.1080/10888705.2021.1983723
    Database NAL-Catalogue (AGRICOLA)

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  2. Article ; Online: Growing and laying performances of two varieties of Noi chickens raised in an intensive farming system

    Vu Hoa Dang / Van Diep Duong / Thi Huong Nguyen / Ngoc Khanh Do / Thi Hue Le / Minh Hieu Nguyen / Thi Ut Tran / Hoang Nguyen Nguyen / Thuy Nhung Dang

    Vietnam Journal of Science, Technology and Engineering, Vol 64, Iss

    2022  Volume 2

    Abstract: This study was conducted to compare the black and dark brown varieties of Noi purebred chickens raised in an intensive farming system. A total of 600 black and 600 dark brown Noi chickens were observed starting from 1 day after hatching. At 20 weeks of ... ...

    Abstract This study was conducted to compare the black and dark brown varieties of Noi purebred chickens raised in an intensive farming system. A total of 600 black and 600 dark brown Noi chickens were observed starting from 1 day after hatching. At 20 weeks of age, 30 black Noi cocks and 300 black Noi hens, as well as 30 dark brown Noi cocks and 300 dark brown Noi hens, were studied until the beginning of reproduction. All roosters and hens were kept in individual cages and mating was accomplished artificially. At 24 weeks of age, the black and dark brown Noi cocks had average weights of 2555 and 2600 g, respectively, and 1796 and 1830 g for hens, respectively. There was no difference in body weight between the two varieties. The first egg-laying ages of both varieties were relatively late. From the age of 25 weeks up to 50 weeks, the egg yields of the black and dark brown Noi hens were 74.33 and 77.98 eggs/hen, respectively, with average egg weights of 48.3 and 49.7 g, respectively. Embryonic egg rates were low at 80.3 and 81.9% for the black and dark brown varieties, respectively, and the rate of chick/incubated eggs was 73.4 and 77.0%, respectively. The Noi chickens, especially the dark brown variety, reached a relatively high egg yield in an intensive farming system, which creates great potential for the exploitation and development of this genetic source.
    Keywords growth performance ; laying performance ; native hen ; Noi chicken ; Science ; Q
    Subject code 630
    Language English
    Publishing date 2022-06-01T00:00:00Z
    Publisher Vietnam Ministry of Science and Technology
    Document type Article ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

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  3. Article ; Online: Effects of Stocking Density in Group Cages on Egg Production, Profitability, and Aggressive Pecking of Hens.

    Hanh, Han Quang / Phuong, Nguyen Thi / Tien, Nguyen Dinh / Nhung, Dang Thuy / Lebailly, Philippe / Ton, Vu Dinh

    Journal of applied animal welfare science : JAAWS

    2021  Volume 26, Issue 3, Page(s) 374–385

    Abstract: There is an increasing concern about welfare issues related to battery cages, which are commonly used in Vietnam, and requires a modified cage that improves hen welfare while retaining its economic and management advantages. We combined adjacent ... ...

    Abstract There is an increasing concern about welfare issues related to battery cages, which are commonly used in Vietnam, and requires a modified cage that improves hen welfare while retaining its economic and management advantages. We combined adjacent conventional cages to form group cages to examine the effects of stocking density on egg production, economic returns, and aggressive pecking of hens. The control group included triplicate conventional cages with four birds/single cage (12 hens per three cages) or 450 cm
    MeSH term(s) Animals ; Female ; Chickens ; Housing, Animal ; Ovum ; Floors and Floorcoverings
    Language English
    Publishing date 2021-10-13
    Publishing country England
    Document type Journal Article
    ISSN 1532-7604
    ISSN (online) 1532-7604
    DOI 10.1080/10888705.2021.1983723
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  4. Article: Characteristics of Pleurotus sp. TD36 and its ability to reduce wood extractives in pretreatment for pulping

    Thao, Phan Thi Hong / Lien, Nguyen Thi Hong / Van Hieu, Nguyen / Linh, Nguyen Vu Mai / Nhung, Dang Thi / Huong, Tran Thi / Van Son, Cao

    European journal of wood and wood products. 2021 Sept., v. 79, no. 5

    2021  

    Abstract: Lipophilic extractives of wood cause pitch deposition during pulp and paper production, leading to serious economic losses and environmental pollution. Natural seasoning of wood material before pulping can reduce wood extractives, but there is no control ...

    Abstract Lipophilic extractives of wood cause pitch deposition during pulp and paper production, leading to serious economic losses and environmental pollution. Natural seasoning of wood material before pulping can reduce wood extractives, but there is no control of the pulp yield and quality. Pretreatment of the wood chips with selected fungi is regarded as better controlled seasoning with effective removal of problematic extractives. Commercially available fungal preparations are effective mostly for softwood, but not quite suitable for Acacia mangium and hybrid hardwood—the main pulpwood of Vietnam. In this paper, a fungal isolate TD36 was identified as white-rot basidiomycete Pleurotus sp. TD36 based on the biological characteristics and phylogenetic analysis. Having high activity of ligninolytic enzymes, amylase and protease, Pleurotus sp. TD36 was able to degrade lignin-like compounds (guaiacol, Remazol Brilliant Blue), starch and casein. Degradation of wood extractives was evaluated by laccase and sterol esterase assays of the fungus in shake flask cultures and in pretreatment of Acacia wood chips. Favorable conditions for wood pretreatment were selected, including: inoculum size, 1% v/w; wood moisture, 60% v/w; temperature, 28–30 °C and 30 days. Under such conditions, Pleurotus sp. TD36 removed about 68 ± 2.75% of wood acetone extractives soluble in chloroform. Of that, about 73–89% of fatty acids and fatty alcohols, 76% of free sterols and 63% of sterol ester, were removed. Fungal pretreatment did not significantly affect the cellulose content of wood and Kraft pulp yield.
    Keywords Acacia mangium ; Pleurotus ; acetone ; amylases ; casein ; cellulose ; chloroform ; culture flasks ; guaiacol ; hybrids ; inoculum ; kraft pulp ; laccase ; lipophilicity ; papermaking ; phylogeny ; pollution ; proteinases ; pulpwood ; softwood ; starch ; sterol esterase ; sterols ; temperature ; wood extractives ; wood moisture ; Vietnam
    Language English
    Dates of publication 2021-09
    Size p. 1315-1324.
    Publishing place Springer Berlin Heidelberg
    Document type Article
    ZDB-ID 2485250-8
    ISSN 1436-736X ; 0018-3768
    ISSN (online) 1436-736X
    ISSN 0018-3768
    DOI 10.1007/s00107-021-01687-1
    Database NAL-Catalogue (AGRICOLA)

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  5. Article: Antibiotics in the aquatic environment of Vietnam: Sources, concentrations, risk and control strategy

    Binh, Vu Ngan / Nhung Dang / Nguyen Thi Kieu Anh / Le Xuan Ky / Phong K. Thai

    Chemosphere. 2018 Apr., v. 197

    2018  

    Abstract: The presence of antibiotics in the aquatic environment is a serious concern because it may lead to the emergence of antibiotic resistance, thus lowering the therapeutic effect of antibiotics. In Vietnam, the problem is aggravated by the irrational use of ...

    Abstract The presence of antibiotics in the aquatic environment is a serious concern because it may lead to the emergence of antibiotic resistance, thus lowering the therapeutic effect of antibiotics. In Vietnam, the problem is aggravated by the irrational use of antibiotics in different sectors of agriculture and human health service. Moreover, the residues of antibiotics in the aquatic environment can be spread widely due to the lack of proper wastewater treatment systems. In this paper, we aim to comprehensively review all relevant sources that discharge antibiotics to the aquatic environment in Vietnam. Apart from the common source of antibiotics from aquaculture, other activities that release considerable amounts of antibiotics into water environment are also included. Environmental concentrations of antibiotics related to those sources are studied to demonstrate their contributions to the presence of antibiotics in the aquatic environment in Vietnam. As antibiotic-contained water may be used as water supply for irrigation and even human consumption in rural areas, the essence of wastewater treatment is highlighted. Finally, we also discuss the new National Action plan from the Ministry of Health for controlling the issue of antibiotic resistance in Vietnam.
    Keywords antibiotic resistance ; antibiotics ; aquaculture ; aquatic environment ; health services ; human health ; humans ; irrigation ; risk ; rural areas ; therapeutics ; wastewater treatment ; water supply ; Vietnam
    Language English
    Dates of publication 2018-04
    Size p. 438-450.
    Publishing place Elsevier Ltd
    Document type Article
    ZDB-ID 120089-6
    ISSN 1879-1298 ; 0045-6535 ; 0366-7111
    ISSN (online) 1879-1298
    ISSN 0045-6535 ; 0366-7111
    DOI 10.1016/j.chemosphere.2018.01.061
    Database NAL-Catalogue (AGRICOLA)

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  6. Article: Can wastewater-based epidemiology be used to evaluate the health impact of temperature? – An exploratory study in an Australian population

    Phung, Dung / Jochen Mueller / Foon Yin Lai / Jake O’Brien / Nhung Dang / Lidia Morawska / Phong K. Thai

    Environmental research. 2017 July, v. 156

    2017  

    Abstract: Ambient temperature is known to have impact on population health but assessing its impact by the traditional cohort approach is resource intensive. Wastewater-based epidemiology (WBE) could be an alternative for the traditional approach. This study was ... ...

    Abstract Ambient temperature is known to have impact on population health but assessing its impact by the traditional cohort approach is resource intensive. Wastewater-based epidemiology (WBE) could be an alternative for the traditional approach. This study was to provide the first evaluation to see if WBE can be used to assess the impact of temperature exposure to a population in South East Queensland, Australia using selected pharmaceuticals and personal care products (PPCPs) as biomarkers. Daily loads of eight PPCPs in wastewater collected from a wastewater treatment plant were measured from February 2011 to June 2012. Corresponding daily weather data were obtained from the closest weather station. Missing data of PPCPs were handled using the multiple imputation (MI) method, then we used a one-way between-groups analysis of variance to examine the seasonal effect on daily variation of PPCPs by seasons. Finally, an MI estimate was performed to evaluate the continuous relationship between daily average temperature and each multiply-imputed PPCP using time-series regression analysis. The results indicated that an increase of 1°C in average temperature associated with decrease at 1.3g/d (95% CI: −2.2 to (−0.4), p<0.05) for atenolol, increase at 36.5g/d (95% CI: 25.2–47.8, p<0.01) for acesulfame, and increase at 0.8g/d (95% CI: 0.02–1.55, p=0.05) for naproxen. No significant association was observed between temperature and the remaining PPCPs, comprising: caffeine, carbamazepine, codeine, hydrochlorothiazide, and salicylic acid. The findings suggested that consumption of sweetened drinks, risk of worsening cardiovascular conditions and pains are associated with variation in ambient temperature. WBE can thus be used as a complementary method to traditional cohort studies in epidemiological evaluation of the association between environmental factors and health outcomes provided that specific biomarkers of such health outcomes can be identified.
    Keywords acesulfame potassium ; ambient temperature ; beverages ; biomarkers ; caffeine ; codeine ; cohort studies ; drugs ; epidemiology ; hydrochlorothiazide ; meteorological data ; personal care products ; regression analysis ; risk ; salicylic acid ; seasonal variation ; time series analysis ; wastewater ; wastewater treatment ; Queensland
    Language English
    Dates of publication 2017-07
    Size p. 113-119.
    Publishing place Elsevier Inc.
    Document type Article
    ZDB-ID 205699-9
    ISSN 1096-0953 ; 0013-9351
    ISSN (online) 1096-0953
    ISSN 0013-9351
    DOI 10.1016/j.envres.2017.03.023
    Database NAL-Catalogue (AGRICOLA)

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  7. Article: Temporal trend of pesticide concentrations in the Chikugo River (Japan) with changes in environmental regulation and field infrastructure

    Phong, Thai Khanh / Inoue, Tsuyoshi / Yoshino, Katsunori / Hiramatsu, Kazuaki / Nhung, Dang Thi Tuyet

    Agricultural water management. 2012 Oct., v. 113

    2012  

    Abstract: Contamination of pesticides, which are applied to rice paddy fields, in river water has been a major problem in Japan for decades. A prolonged water holding period after pesticide application in paddy fields is expected to reduce the concentration of ... ...

    Abstract Contamination of pesticides, which are applied to rice paddy fields, in river water has been a major problem in Japan for decades. A prolonged water holding period after pesticide application in paddy fields is expected to reduce the concentration of rice pesticides in river water. Therefore, a long monitoring campaign was conducted from 2004 to 2010 to measure the concentrations of pesticides in water samples collected from several points along the Chikugo River (Japan) including tributaries and the main stream to see if there was any reduction in the level of pesticide contamination after the extension of the water holding period (from 3–4 days to 7 days) was introduced in 2007 by the new water management regulation. No significant difference (p>0.05) was found in pesticide concentrations between the periods before and after 2007 in all monitoring points, except in one tributary where the pesticide concentrations after 2007 were even higher than that of the previous period. A detailed study in one of the tributaries also revealed that the renovated infrastructure did not reduce the pesticide concentrations in the drainage canals. Neither the introduction of the new regulation nor the improved infrastructure had any significant effect on reducing the contamination of pesticides in water of the Chikugo River. It is probably because most farmers did not properly implement the new requirement of holding paddy water within the field for 7 days after the application of pesticides. Only tightening the regulation would not be sufficient and more actions should be taken to enforce/provide extension support for the new water management regulation in order to reduce the level of residual pesticides in river water in Japan.
    Keywords drainage channels ; environmental law ; infrastructure ; paddies ; pesticide application ; pesticides ; rice ; river water ; rivers ; water management ; Japan
    Language English
    Dates of publication 2012-10
    Size p. 96-104.
    Publishing place Elsevier B.V.
    Document type Article
    ZDB-ID 751144-9
    ISSN 1873-2283 ; 0378-3774
    ISSN (online) 1873-2283
    ISSN 0378-3774
    DOI 10.1016/j.agwat.2012.07.002
    Database NAL-Catalogue (AGRICOLA)

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  8. Article ; Online: Behavior of simetryn and thiobencarb in the plough zone of rice fields.

    Phong, Thai K / Nhung, Dang T T / Motobayashi, Takashi / Watanabe, Hirozumi

    Bulletin of environmental contamination and toxicology

    2009  Volume 83, Issue 6, Page(s) 794–798

    Abstract: The behavior of simetryn and thiobencarb in flooded rice soil was investigated in a 2-year study. The concentrations of simetryn and thiobencarb were in the hundreds of μg kg−1 in the top soil layer (0–5 cm) and became significantly lower in tens of μg ... ...

    Abstract The behavior of simetryn and thiobencarb in flooded rice soil was investigated in a 2-year study. The concentrations of simetryn and thiobencarb were in the hundreds of μg kg−1 in the top soil layer (0–5 cm) and became significantly lower in tens of μg kg−1 in the deeper soil layers (5–10 and 10–15 cm). The half-lives of the two herbicides were also shorter (36 and 17 days for simetryn and thiobencarb, respectively) in the top soil layer, as they were most affected by environmental conditions, compared with corresponding values of 82 and 69 days in the 5–10 cm soil layer. Simetryn concentration was stable, while thiobencarb’s half-life was 165 days in the 10–15 cm layer. About 35% of the applied mass of simetryn and thiobencarb were found in the rice soil compartment.
    MeSH term(s) Agriculture ; Environmental Monitoring ; Half-Life ; Herbicides/analysis ; Herbicides/chemistry ; Kinetics ; Models, Chemical ; Oryza ; Risk Assessment ; Soil/chemistry ; Soil Pollutants/analysis ; Soil Pollutants/chemistry ; Thiocarbamates/analysis ; Thiocarbamates/chemistry ; Triazines/analysis ; Triazines/chemistry
    Chemical Substances Herbicides ; Soil ; Soil Pollutants ; Thiocarbamates ; Triazines ; simetryn (036180247V) ; benthiocarb (90LN6Y7I7H)
    Language English
    Publishing date 2009-12
    Publishing country United States
    Document type Journal Article
    ZDB-ID 6895-0
    ISSN 1432-0800 ; 0007-4861
    ISSN (online) 1432-0800
    ISSN 0007-4861
    DOI 10.1007/s00128-009-9810-9
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  9. Article: Changes in lycopene and beta carotene contents in aril and oil of gac fruit during storage

    Nhung, Dang Thi Tuyet / Bung, Pham Ngoc / Ha, Nguyen Thu / Phong, Thai Khanh

    Food chemistry. 2010 July 15, v. 121, no. 2

    2010  

    Abstract: Gac fruits were physically measured and stored under ambient conditions for up to 2weeks to observe changes in carotenoid contents (lycopene and beta carotene) in its aril. Initial concentrations in the aril of lycopene were from 2.378mg/g fresh weight ( ... ...

    Abstract Gac fruits were physically measured and stored under ambient conditions for up to 2weeks to observe changes in carotenoid contents (lycopene and beta carotene) in its aril. Initial concentrations in the aril of lycopene were from 2.378mg/g fresh weight (FW) to 3.728mg/g FW and those of beta carotene were from 0.257 to 0.379mg/g FW. Carotenoid concentrations in the aril remained stable after 1week but sharply declined after 2weeks of storage. Gac oil, pressed from gac aril, has similar concentrations of lycopene and beta carotene (2.436 and 2.592mg/g, respectively). Oil was treated with 0.02% of butylated hydroxytoluene, or with a stream of nitrogen or untreated then stored in the dark for up to 15 or 19weeks under different temperatures (5°C, ambient, 45 and 60°C). Lycopene and beta carotene in control gac oil degraded following the first-order kinetic model. The degradation rate of lycopene and beta carotene in the treated oil samples were lower than that in the control oil but the first-order kinetic was not always followed. However, both lycopene and beta carotene degraded quickly in gac oil with the first-order kinetic under high temperature conditions (45 and 60°C) regardless of the treatments used.
    Keywords Momordica ; essential oils ; fruit composition ; lycopene ; phytochemicals ; beta-carotene ; vitamin content ; food storage ; storage quality ; food nutrient losses ; ambient temperature ; storage temperature ; fruits (food) ; kinetics ; mathematical models ; chemical degradation ; storage time ; lipid peroxidation ; plant fats and oils
    Language English
    Dates of publication 2010-0715
    Size p. 326-331.
    Publishing place [Amsterdam]: Elsevier Science
    Document type Article
    ZDB-ID 243123-3
    ISSN 1873-7072 ; 0308-8146
    ISSN (online) 1873-7072
    ISSN 0308-8146
    DOI 10.1016/j.foodchem.2009.12.032
    Database NAL-Catalogue (AGRICOLA)

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  10. Article: Behavior of Simetryn and Thiobencarb in the Plough Zone of Rice Fields

    Phong, Thai K / Nhung, Dang T. T / Motobayashi, Takashi / Watanabe, Hirozumi

    Bulletin of environmental contamination and toxicology. 2009 Dec., v. 83, no. 6

    2009  

    Abstract: The behavior of simetryn and thiobencarb in flooded rice soil was investigated in a 2-year study. The concentrations of simetryn and thiobencarb were in the hundreds of μg kg⁻¹ in the top soil layer (0-5 cm) and became significantly lower in tens of μg ... ...

    Abstract The behavior of simetryn and thiobencarb in flooded rice soil was investigated in a 2-year study. The concentrations of simetryn and thiobencarb were in the hundreds of μg kg⁻¹ in the top soil layer (0-5 cm) and became significantly lower in tens of μg kg⁻¹ in the deeper soil layers (5-10 and 10-15 cm). The half-lives of the two herbicides were also shorter (36 and 17 days for simetryn and thiobencarb, respectively) in the top soil layer, as they were most affected by environmental conditions, compared with corresponding values of 82 and 69 days in the 5-10 cm soil layer. Simetryn concentration was stable, while thiobencarb's half-life was 165 days in the 10-15 cm layer. About 35% of the applied mass of simetryn and thiobencarb were found in the rice soil compartment.
    Keywords environmental factors ; paddies ; rice soils ; simetryn ; thiobencarb ; topsoil
    Language English
    Dates of publication 2009-12
    Size p. 794-798.
    Publisher Springer-Verlag
    Publishing place New York
    Document type Article
    ZDB-ID 6895-0
    ISSN 1432-0800 ; 0007-4861
    ISSN (online) 1432-0800
    ISSN 0007-4861
    DOI 10.1007/s00128-009-9810-9
    Database NAL-Catalogue (AGRICOLA)

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