Microbial degradation of the apical internode of Co125 and W401 maize in the rumen

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Are sheep able to develop preferences or aversions in response to an increase of rumen fill?

International audienceWe conducted two conditioning experiments to investigate whether sheep are able to develop preferences of aversions in response to an increase of rumen fill performed with 300 or 600 g chopped straw introduced through the rumen fistula. When sheep where fed a basal diet of hay (Experiment 1) they developed aversions against the feeds associated with the increase of rumen fi ll without a dose effect. When they were fed a diet of pellets of beet pulp (Experiment 2) they developed neither preferences nor aversions. These results indicate that physical consequences of feed intake are integrated by the animals and that they can contribute to diet choice via diet learning

Are sheep able to develop preferences or aversions in response to an increase of rumen fill?

International audienceWe conducted two conditioning experiments to investigate whether sheep are able to develop preferences of aversions in response to an increase of rumen fill performed with 300 or 600 g chopped straw introduced through the rumen fistula. When sheep where fed a basal diet of hay (Experiment 1) they developed aversions against the feeds associated with the increase of rumen fi ll without a dose effect. When they were fed a diet of pellets of beet pulp (Experiment 2) they developed neither preferences nor aversions. These results indicate that physical consequences of feed intake are integrated by the animals and that they can contribute to diet choice via diet learning

Kinetic study of the degradation of wheat straw and maize stem by pure cultures of anaerobic rumen fungi observed by scanning electron microscopy

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Colonisation bactérienne des résidus alimentaires des sachets incubés dans le rumen : utilisation du « stomacher » pour la réduire et conséquences sur la mesure de la dégradabilité ruminale de l'azote

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Valeur alimentaire des pailles de céréales chez le mouton. I. — Influence de la complémentation azotée et énergétique sur l'ingestion et l'utilisation digestive d'une paille d'orge

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Polyethylene glycol determined by near-infrared reflectance spectroscopy to estimate faecal output in sheep fed fresh permanent grassland forage

International audienceThis study evaluated the feasibility of using different doses of polyethylene glycol (PEG) as an external marker of faecal output in sheep fed permanent grasslands fodder and compared two near-infrared reflectance spectroscopy (NIRS) calibration strategies for determining faecal PEG content. Three levels of PEG (0.25%, 0.75% and 1.5% of total daily intake) were administered to eight wethers, with each level dosed twice daily. Animals were fed forage obtained from two permanent grasslands cut at two dates during the first cycle of growth. Polyethylene glycol recovery rate was higher (P < 0.001) at the highest dose (0.78) and decreased as dose level decreased (0.61 and 0.30 for PEG levels of 0.75% and 0.25% of total daily intake, respectively). NIRS calibration equations established on PEG data dosed directly on the faecal samples (0.61) gave higher (P < 0.001) PEG recovery rates than NIRS calibration equations performed on mixtures of faeces with different PEG concentrations (0.49). Finally, faecal output estimates were more accurate (P < 0.001) when faeces were sampled at 8:00 (0.61) than at 16:00 (0.51). The highest PEG recovery rate (0.88) was achieved using the highest dose on morning samples when PEG content was estimated by NIRS using turbidimetric results as reference values. We conclude that the usefulness of PEG as an external marker for estimating faecal output on permanent grasslands is limited at PEG doses lower than 1.5% of intake. (C) 2013 Elsevier B.V. All rights reserved

COMPOSITION CHIMIQUE, DIGESTIBILITÉ ET INGESTIBILITÉ DE LA PLANTE DE TOURNESOL SUR PIED ET APRÈS ENSILAGE

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Etude des quantités ingérées lors des grands repas chez des moutons recevant des fourrages ensilés

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PERTE DE COMPOSÉS VOLATILS LORS DE LA DÉTERMINATION A L'ÉTUVE DE LA TENEUR EN MATIÈRE SÈCHE DES ENSILAGES

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