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Registros recuperados: 5
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Challenges of foraging on a high-quality but unpredictable food source: the dynamics of grass production and consumption in savanna grazing lawns Inra
Bonnet, O.; Fritz, H.; Gignoux, J.; Meuret, M..
1. Grazing lawns are short grassland areas where intense grazing maintains grass in an early growth stage. These areas represent a source of high-quality forage for herbivores. However, as herbivores continually remove nearly all the newly accumulated biomass, instantaneous resource availability depends on the dynamics of grass growth. 2. In this study, we investigate how production and consumption inside grazing lawns are synchronized. We then explore how that synchronization affects the ability of large herbivores to use these lawns. We also provide a critical comparison between grazing lawns and intensively managed grasslands in livestock farms. 3. We investigated vegetation production and herbivore grazing activity during a wet and a dry season using...
Tipo: Journal Article Palavras-chave: DYNAMIQUE DE LA VEGETATION; SYSTEME DE PATURAGE; PATURAGE CONTINU; RHINOCEROS BLANC; RESSOURCE FOURRAGERE; PATURAGE INTENSIF; REGIME DES PLUIES CERATOTHERIUM SIMUN.
Ano: 2010 URL: http://www.prodinra.inra.fr/prodinra/pinra/doc.xsp?id=PROD20107d754831&uri=/notices/prodinra1/2011/04/
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Constraints of feeding on Salicornia ramosissima by wigeon Anas penelope : an experimental approach Inra
Durant, D.; Kersten, M.; Fritz, H.; Juin, H.; Lila, M..
The coastal marshes of the Charente-Maritime (western France) are a major wintering area for wigeon Anas penelope. In these marshes, wigeon feed mainly on grasses, while foraging on Salicornia (a fleshy, succulent halophyte) is uncommon. In order to understand the reason for this under-exploitation, an experimental study was carried out with captive wigeon in autumn 1998 on a Salicornia ramosissima marsh in the Charente-Maritime. Birds were unable to maintain their body weight when feeding on Salicornia. Measurements of food chemical composition and metabolisability, as well as instantaneous intake rate of the birds (g/min) could not explain these weight losses. However, the time budget of wigeon revealed that they spent a maximum of 10–11 h per 24 h...
Tipo: Journal Article Palavras-chave: SALICORNE; CANARD SIFFLEUR WIGEON; DIGESTIVE BOTTLENEK; INTAKE RATE; TIME BUDGET.
Ano: 2006 URL: http://www.prodinra.inra.fr/prodinra/pinra/doc.xsp?id=PROD2006548cf7e&uri=/notices/prodinra1/2011/04/
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Feeding behaviour of sheep on shrubs in response to contrasting herbaceous cover in rangelands dominated by Cytisus scoparius L. Inra
Da Silveira Pontes, L.; Agreil, C.; Magda, D.; Gleizes, B.; Fritz, H..
The foraging responses of ewes faced with a diversity of feed items and their effects on broom (Cytisus scoparius L.) consumption were examined. The experiment was conducted on a farm in the autumn with ewes (n = 33) grazing three small paddocks (0.44 ha on average, for at least 10 days each) located in broom shrubland. The effects of three different herbaceous covers on broom consumption were compared: 100% of paddock area previously grazed in summer; 50% of paddock area previously grazed in summer; and paddock area non-grazed during the year. The characteristics of herbaceous cover (availability and quality) and the ewes’ diet selection were encoded as bite categories. Flock activities were recorded through scan sampling. We used logistic regression to...
Tipo: Journal Article Palavras-chave: RESSOURCE FOURRAGERE BITE; BROOM; FEEDING CHOICES; GRAZING BEHAVIOUR; SHRUB ENCROACHMENT; SHRUBLAND.
Ano: 2010 URL: http://www.prodinra.inra.fr/prodinra/pinra/doc.xsp?id=PROD20104e7484ca&uri=/notices/prodinra1/2011/04/
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Field occupancy by breeding lapwings Vanellus vanellus and redshanks Tringa totanus in agricultural wet grasslands Inra
Durant, D.; Tichit, M.; Fritz, H.; Kerneis, E..
This study is based on a comparative approach to explore how two breeding waders, the lapwing Vanellus vanellus and the redshank Tringa tetanus, respond to cattle grazing in terms of timing and intensity of grazing in the Marais Poitevin (French Atlantic coast). Generalised linear mixed models (GLMM) showed that the two main predictors determining suitable grasslands were sward structure (i.e. mean sward height and tussock frequency) and water surface. A grazing index (LU.days/ha) was then monitored to tackle the extent to which the occupancy of fields by waders depended upon the grazing management involved in previous autumn, as well as in spring (early and mid-spring grazing). Species’ biology as well as variations in their sward structure requirements...
Tipo: Journal Article Palavras-chave: VANELLUS VANELLUS; TRINGA TOTANUS BIRD; BREEDING WADER; GRAZING; SWARD STRUCTURE; WATER SURFACE; WET GRASSLAND.
Ano: 2008 URL: http://www.prodinra.inra.fr/prodinra/pinra/doc.xsp?id=PROD2008c5ca4b94&uri=/notices/prodinra1/2010/09/
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Monoterpene effect on feeding choice by deer Inra
Vourc'h, G.; de Garine-Wichatitsky, M.; Labbé, A.; Rosoloswki, D.; Martin, J.L.; Fritz, H..
A previous study showed that Sitka black-tailed deer (Odocoileus hemionus sitkensis) consumption was negatively correlated with monoterpene content in western redcedar (Thuja plicata). To test whether these monoterpenes were deterrent to Sitka black-tailed deer, we performed feeding choice experiments with four hydrocarbon (sabinene, myrcene, α-pinene, and d + l-limonene) and one oxygenated (α,β-thujone) monoterpene solution at their highest natural concentration in western redcedar foliage. To test whether deer response was species specific, we ran similar experiments on European roe deer (Capreolus capreolus) and rusa deer (Cervus timorensis russa). In all experiments, monoterpenes were repellent. Solutions with α,β-thujone, the major monoterpene in...
Tipo: Journal Article Palavras-chave: MONOTERPENE; ALIMENTATION; NUTRITION; METABOLITE SECONDAIRE; THUJA PLICATA; ODOCOILEUS HEMIONUS SITKENSIS; HYDROCARBONE; TECHNIQUE ANALYTIQUE; THUJONE; REPULSIF MONOTERPENES; DEER; CERVIDS; FEEDING CHOICE; HERBIVORY.
Ano: 2002 URL: http://www.prodinra.inra.fr/prodinra/pinra/doc.xsp?id=PUB0300013198096813&uri=/notices/prodinra1/2010/11/
Registros recuperados: 5
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