Veronika Maurer | Forschungsinstitut für biologischen Landbau - FiBL (original) (raw)

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Papers by Veronika Maurer

Research paper thumbnail of Performance of organic and low input livestock systems: a matter of sound design?

... 2007). Dried chicory abolished egg excretion within 2-6 days, but after withdrawal of the chi... more ... 2007). Dried chicory abolished egg excretion within 2-6 days, but after withdrawal of the chicory faecal egg counts increased. ... WP4.2 Alternative treatment strategies for controlling endo-and ectoparasites of pigs and poultry. POULTRY ...

Research paper thumbnail of New measures to control ectoparasites with reference to red mites

Research paper thumbnail of Control methods for Dermanyssus gallinae in systems for laying hens: results of an international seminar

Worlds Poultry Science Journal, 2009

This paper reports the results of a seminar on poultry red mite (PRM), Dermanyssus gallinae. Eigh... more This paper reports the results of a seminar on poultry red mite (PRM), Dermanyssus gallinae. Eighteen researchers from eight European countries discussed life cycle issues of the mite, effects of mites on hens and egg production, and monitoring and control methods for PRM in poultry facilities. It was determined that PRM probably causes more damage than envisaged, with the cost

Research paper thumbnail of Temperature influence on life table statistics of the chicken mite Dermanyssus gallinae (Acari: Dermanyssidae

Experimental and Applied Acarology, 1992

An age-specific life table for the chicken miteDermanyssus gallinae (DeGeer, 1778) was based on v... more An age-specific life table for the chicken miteDermanyssus gallinae (DeGeer, 1778) was based on various observations carried out at 25°C. The generation time was calculated to be 16.8 days; the intrinsic rate of natural increase was 0.12 per day, and the net reproductive rate was 7.2. A nonlinear function was found satisfactory to describe the developmental rate of the different immature lifestages at temperatures below 40°C. The stage-specific survival of the immature life-stages was generally high between 10 and 37°C, but decreased quickly outside this temperature range. Most of the eggs were laid during the first three weeks of the adult life. The proportion of surviving females rapidly decreases after moulting to the adult stage. At a temperature of 30°C, the highest number of eggs (3 eggs per day) was laid.

Research paper thumbnail of Individual administration of three tanniferous forage plants to lambs artificially infected with Haemonchus contortus and Cooperia curticei

Veterinary Parasitology, 2007

Research paper thumbnail of In vitro efficacies of oils, silicas and plant preparations against the poultry red mite Dermanyssus gallinae

The aim of this study was to test the effectiveness of physically acting substances (oils and sil... more The aim of this study was to test the effectiveness of physically acting substances (oils and silicas) and plant preparations for the control of the poultry red mite Dermanyssus gallinae (De Geer 1778). Reproduction and survival of fed D. gallinae females were evaluated in vitro for a total of 168 h using the “area under the survival curve” (AUC) to compare survival of the mites between treatments. Four oils (two plant oils, one petroleum spray oil and diesel), one soap, three silicas (one synthetic amorphous silica, one diatomaceous earth (DE) and one DE with 2% pyrethrum extract) and seven plant preparations (derived from Chrysanthemum cineariaefolium, Allium sativum, Tanacetum vulgare, Yucca schidigera, Quillaja saponaria, Dryopteris filix-mas, and Thuja occidentalis) were tested at various concentrations. All the oils, diesel and soap significantly reduced D. gallinae survival. All silicas tested inhibited reproduction. DE significantly reduced mite survival, but amorphous silica was less effective in vitro. Except for pure A. sativum juice and the highest concentration of C. cineariaefolium extract, the plant preparations tested resulted in statistically insignificant control of D. gallinae.

Research paper thumbnail of The anthelmintic efficacy of five plant products against gastrointestinal trichostrongylids in artificially infected lambs

Veterinary Parasitology, 2003

Research paper thumbnail of In vitro screening of six anthelmintic plant products against larval Haemonchus contortus with a modified methyl-thiazolyl-tetrazolium reduction assay

Journal of Ethnopharmacology, 2006

Research paper thumbnail of A population model for Dermanyssus gallinae (Acari: Dermanyssidae

Experimental and Applied Acarology, 1994

A model based on a time-varying distributed delay with attrition was developed for simulating the... more A model based on a time-varying distributed delay with attrition was developed for simulating the population dynamics of the chicken mite Dermanyssus gallinae (DeGeer, 1778). The model was parametrised according to cohort life table studies conducted under constant temperature conditions and was validated with two independent data set obtained in an experimental poultry house. The predicted mite densities and the stage-structure of the population corresponded to the values observed during experimental periods of 32, and 11 weeks, respectively. Temperature and a poultry house-specific density effect were determined to control the population development.

Research paper thumbnail of Effect of sainfoin ( Onobrychis viciifolia) silage and hay on established populations of Haemonchus contortus and Cooperia curticei in lambs

Veterinary Parasitology, 2006

Research paper thumbnail of Silicas for control of the poultry red mite Dermanyssus gallinae

Research paper thumbnail of Do stocking rate and a simple run management practice influence the infection of laying hens with gastrointestinal helminths

Veterinary Parasitology, 2009

Research paper thumbnail of Poultry litter as a source of gastrointestinal helminth infections

Veterinary Parasitology, 2009

Research paper thumbnail of In vitro efficacies of oils, silicas and plant preparations against the poultry red mite Dermanyssus gallinae

Experimental and Applied Acarology, 2009

The aim of this study was to test the effectiveness of physically acting substances (oils and sil... more The aim of this study was to test the effectiveness of physically acting substances (oils and silicas) and plant preparations for the control of the poultry red mite Dermanyssus gallinae (De Geer 1778). Reproduction and survival of fed D. gallinae females were evaluated in vitro for a total of 168 h using the “area under the survival curve” (AUC) to compare survival of the mites between treatments. Four oils (two plant oils, one petroleum spray oil and diesel), one soap, three silicas (one synthetic amorphous silica, one diatomaceous earth (DE) and one DE with 2% pyrethrum extract) and seven plant preparations (derived from Chrysanthemum cineariaefolium, Allium sativum, Tanacetum vulgare, Yucca schidigera, Quillaja saponaria, Dryopteris filix-mas, and Thuja occidentalis) were tested at various concentrations. All the oils, diesel and soap significantly reduced D. gallinae survival. All silicas tested inhibited reproduction. DE significantly reduced mite survival, but amorphous silica was less effective in vitro. Except for pure A. sativum juice and the highest concentration of C. cineariaefolium extract, the plant preparations tested resulted in statistically insignificant control of D. gallinae.

Research paper thumbnail of Effect of sainfoin ( Onobrychis Viciifolia ) silage and hay against gastrointestinal nematodes in lambs

Research paper thumbnail of QLIF Workshop 4: Performance of organic and low input livestock systems: a matter of sound design

... 2007). Dried chicory abolished egg excretion within 2-6 days, but after withdrawal of the chi... more ... 2007). Dried chicory abolished egg excretion within 2-6 days, but after withdrawal of the chicory faecal egg counts increased. ... WP4.2 Alternative treatment strategies for controlling endo-and ectoparasites of pigs and poultry. POULTRY ...

Research paper thumbnail of Performance of organic and low input livestock systems: a matter of sound design?

... 2007). Dried chicory abolished egg excretion within 2-6 days, but after withdrawal of the chi... more ... 2007). Dried chicory abolished egg excretion within 2-6 days, but after withdrawal of the chicory faecal egg counts increased. ... WP4.2 Alternative treatment strategies for controlling endo-and ectoparasites of pigs and poultry. POULTRY ...

Research paper thumbnail of New measures to control ectoparasites with reference to red mites

Research paper thumbnail of Control methods for Dermanyssus gallinae in systems for laying hens: results of an international seminar

Worlds Poultry Science Journal, 2009

This paper reports the results of a seminar on poultry red mite (PRM), Dermanyssus gallinae. Eigh... more This paper reports the results of a seminar on poultry red mite (PRM), Dermanyssus gallinae. Eighteen researchers from eight European countries discussed life cycle issues of the mite, effects of mites on hens and egg production, and monitoring and control methods for PRM in poultry facilities. It was determined that PRM probably causes more damage than envisaged, with the cost

Research paper thumbnail of Temperature influence on life table statistics of the chicken mite Dermanyssus gallinae (Acari: Dermanyssidae

Experimental and Applied Acarology, 1992

An age-specific life table for the chicken miteDermanyssus gallinae (DeGeer, 1778) was based on v... more An age-specific life table for the chicken miteDermanyssus gallinae (DeGeer, 1778) was based on various observations carried out at 25°C. The generation time was calculated to be 16.8 days; the intrinsic rate of natural increase was 0.12 per day, and the net reproductive rate was 7.2. A nonlinear function was found satisfactory to describe the developmental rate of the different immature lifestages at temperatures below 40°C. The stage-specific survival of the immature life-stages was generally high between 10 and 37°C, but decreased quickly outside this temperature range. Most of the eggs were laid during the first three weeks of the adult life. The proportion of surviving females rapidly decreases after moulting to the adult stage. At a temperature of 30°C, the highest number of eggs (3 eggs per day) was laid.

Research paper thumbnail of Individual administration of three tanniferous forage plants to lambs artificially infected with Haemonchus contortus and Cooperia curticei

Veterinary Parasitology, 2007

Research paper thumbnail of In vitro efficacies of oils, silicas and plant preparations against the poultry red mite Dermanyssus gallinae

The aim of this study was to test the effectiveness of physically acting substances (oils and sil... more The aim of this study was to test the effectiveness of physically acting substances (oils and silicas) and plant preparations for the control of the poultry red mite Dermanyssus gallinae (De Geer 1778). Reproduction and survival of fed D. gallinae females were evaluated in vitro for a total of 168 h using the “area under the survival curve” (AUC) to compare survival of the mites between treatments. Four oils (two plant oils, one petroleum spray oil and diesel), one soap, three silicas (one synthetic amorphous silica, one diatomaceous earth (DE) and one DE with 2% pyrethrum extract) and seven plant preparations (derived from Chrysanthemum cineariaefolium, Allium sativum, Tanacetum vulgare, Yucca schidigera, Quillaja saponaria, Dryopteris filix-mas, and Thuja occidentalis) were tested at various concentrations. All the oils, diesel and soap significantly reduced D. gallinae survival. All silicas tested inhibited reproduction. DE significantly reduced mite survival, but amorphous silica was less effective in vitro. Except for pure A. sativum juice and the highest concentration of C. cineariaefolium extract, the plant preparations tested resulted in statistically insignificant control of D. gallinae.

Research paper thumbnail of The anthelmintic efficacy of five plant products against gastrointestinal trichostrongylids in artificially infected lambs

Veterinary Parasitology, 2003

Research paper thumbnail of In vitro screening of six anthelmintic plant products against larval Haemonchus contortus with a modified methyl-thiazolyl-tetrazolium reduction assay

Journal of Ethnopharmacology, 2006

Research paper thumbnail of A population model for Dermanyssus gallinae (Acari: Dermanyssidae

Experimental and Applied Acarology, 1994

A model based on a time-varying distributed delay with attrition was developed for simulating the... more A model based on a time-varying distributed delay with attrition was developed for simulating the population dynamics of the chicken mite Dermanyssus gallinae (DeGeer, 1778). The model was parametrised according to cohort life table studies conducted under constant temperature conditions and was validated with two independent data set obtained in an experimental poultry house. The predicted mite densities and the stage-structure of the population corresponded to the values observed during experimental periods of 32, and 11 weeks, respectively. Temperature and a poultry house-specific density effect were determined to control the population development.

Research paper thumbnail of Effect of sainfoin ( Onobrychis viciifolia) silage and hay on established populations of Haemonchus contortus and Cooperia curticei in lambs

Veterinary Parasitology, 2006

Research paper thumbnail of Silicas for control of the poultry red mite Dermanyssus gallinae

Research paper thumbnail of Do stocking rate and a simple run management practice influence the infection of laying hens with gastrointestinal helminths

Veterinary Parasitology, 2009

Research paper thumbnail of Poultry litter as a source of gastrointestinal helminth infections

Veterinary Parasitology, 2009

Research paper thumbnail of In vitro efficacies of oils, silicas and plant preparations against the poultry red mite Dermanyssus gallinae

Experimental and Applied Acarology, 2009

The aim of this study was to test the effectiveness of physically acting substances (oils and sil... more The aim of this study was to test the effectiveness of physically acting substances (oils and silicas) and plant preparations for the control of the poultry red mite Dermanyssus gallinae (De Geer 1778). Reproduction and survival of fed D. gallinae females were evaluated in vitro for a total of 168 h using the “area under the survival curve” (AUC) to compare survival of the mites between treatments. Four oils (two plant oils, one petroleum spray oil and diesel), one soap, three silicas (one synthetic amorphous silica, one diatomaceous earth (DE) and one DE with 2% pyrethrum extract) and seven plant preparations (derived from Chrysanthemum cineariaefolium, Allium sativum, Tanacetum vulgare, Yucca schidigera, Quillaja saponaria, Dryopteris filix-mas, and Thuja occidentalis) were tested at various concentrations. All the oils, diesel and soap significantly reduced D. gallinae survival. All silicas tested inhibited reproduction. DE significantly reduced mite survival, but amorphous silica was less effective in vitro. Except for pure A. sativum juice and the highest concentration of C. cineariaefolium extract, the plant preparations tested resulted in statistically insignificant control of D. gallinae.

Research paper thumbnail of Effect of sainfoin ( Onobrychis Viciifolia ) silage and hay against gastrointestinal nematodes in lambs

Research paper thumbnail of QLIF Workshop 4: Performance of organic and low input livestock systems: a matter of sound design

... 2007). Dried chicory abolished egg excretion within 2-6 days, but after withdrawal of the chi... more ... 2007). Dried chicory abolished egg excretion within 2-6 days, but after withdrawal of the chicory faecal egg counts increased. ... WP4.2 Alternative treatment strategies for controlling endo-and ectoparasites of pigs and poultry. POULTRY ...