Accuracy of the ytterbium-faecal index method for estimating intake of pasture-fed dairy goats

Autor: Delagarde, Remy, Belarbre, Nina, Charpentier, Alexia
Přispěvatelé: Physiologie, Environnement et Génétique pour l'Animal et les Systèmes d'Elevage [Rennes] (PEGASE), AGROCAMPUS OUEST-Institut National de la Recherche Agronomique (INRA), UE 1373 Fourrages Environnement Ruminants Lusignan, Institut National de la Recherche Agronomique (INRA)-Physiologie Animale et Systèmes d'Elevage (PHASE), Institut National de la Recherche Agronomique (INRA)-Environnement et Agronomie (E.A.)-Biologie et Amélioration des Plantes (BAP)-Fourrages Environnement Ruminants Lusignan (FERLUS), Institut National de la Recherche Agronomique (INRA)-AGROCAMPUS OUEST, Institut national d'enseignement supérieur pour l'agriculture, l'alimentation et l'environnement (Institut Agro)-Institut national d'enseignement supérieur pour l'agriculture, l'alimentation et l'environnement (Institut Agro), Fourrages Environnement Ruminants Lusignan (FERLUS), Institut National de la Recherche Agronomique (INRA)
Jazyk: angličtina
Rok vydání: 2018
Předmět:
Zdroj: 27. General meeting of the European Grassland Federation (EGF)
27. General meeting of the European Grassland Federation (EGF), Jun 2018, Cork, Ireland
Grassland Science in Europe
Sustainable meat and milk production from grasslands. (23)2018; 27. General meeting of the European Grassland Federation (EGF), Cork, IRL, 2018-06-17-2018-06-21, 419-421
Popis: There is no validated method for estimating pasture intake of dairy goats receiving concentrates and grazing on multispecies swards. The objective of this study was to determine the accuracy of a method based on estimates of faecal output (from ytterbium (Yb) oxide dilution), and of diet digestibility (from faecal N concentration). Four indoor experiments with six goats each were carried out between 2014 and 2016, comparing several feeding management factors: concentrate supplementation level, diet feeding level and pasture regrowth age. Actual daily intake, faecal output, in vivo diet digestibility, faecal N concentration and faecal recovery rate of Yb were determined individually over five days at the end of each period. Pasture intake was also estimated from faecal N and Yb concentrations. The relative mean prediction error between actual and estimated pasture intake was low (7%), with no line or mean biases, and a faecal Yb recovery close to 1.0. Random error came equally from the estimates of faecal output and of indigestibility. It is concluded that the Yb-faecal index method is accurate and suitable for estimating pasture intake of dairy goats grazing on multispecies swards whether or not supplemented with concentrate.
Databáze: OpenAIRE
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