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- W2028479954 abstract "Browse and cereal stubble represent the two most important resources for grazing small ruminants in dry Mediterranean areas. The purpose of the present review is to provide updated information regarding their nutritional value. In a mixed Mediterranean environment, browse represents at least 40% of goat’s diet. Most browse species in the Mediterranean are rich in tanniferous phenolic substances. Polyethylene glycol (PEG) can bind tannins irreversibly over a wide range of pH and is efficient in alleviating the negative effects of tannins. Supplementing with PEG improves intake and digestibility in grazing goats and sheep and has the potential to be economically profitable. The chemical composition of wheat stubble is affected by the cultivar of wheat and climate, but not tillage management. The quality of stubble from early maturing is lower than from late maturing cultivars. Stubble contains more protein in years of lower rainfall. If grains escaped from the harvest combine (2% of grain yield) are included, digestibility of OM from different components ranges between ±80% (grain) to ±40% (stem). Also, the energy requirement of sheep grazing on stubble may be 70% higher than in shaded feedlot. Therefore, the body condition changes of sheep grazing on stubble exhibit a cyclic pattern consequent with temporal changes in nutritive quality. Because stubble grazing is concurrent with the onset of oestrous season, supplementation with grains from legume species-rich in degradable protein-is needed to prevent impairment of body condition. Supplementing browsing goats with PEG, and sheep grazing cereal stubble with moderate amounts of legume grain, may enable the use of these traditional resources in the frame of sustainable production systems. Les broussailles et les chaumes de céréales représentent les deux plus importantes ressources alimentaires des petits ruminants pâturant sur les zones sèches du bassin méditerranéen. En milieu méditerranéen, la broussaille représente au moins 40% du régime des chèvres. La plupart des espèces de broussailles rencontrées en Méditerranée est riche en substances phénoliques de type tannins. Le polyéthylène glycol (PEG) peut lier les tannins de façon irréversible sur une très large plage de pH et il est efficace pour limiter les effets négatifs des tannins. La supplémentation en PEG améliore la consommation et la digestibilité des chèvres et des moutons au pâturage et elle a le potentiel d’être économiquement rentable. La composition chimique des chaumes de céréales dépend du cultivar de blé et du climat mais non des conditions du labour. La qualité des chaumes des variétés précoces est moins élevée que celle des cultivars tardifs. Les chaumes contiennent plus de protéines dans les années à faible pluviométrie. Quand le grain s’échappant de la moissoneuse-batteuse (2% des grains) est pris en compte, la digestibilité de la matière organique de différents constituants se situe entre 80% pour le grain et 40% pour les tiges. Le besoin énergétique du mouton pâturant sur des chaumes peut être de 70% supérieur à celui des animaux en feedlot à l’ombre. Par conséquent, le changement de l’état corporel des moutons pâturant sur des chaumes présente un profil cyclique en relation avec les changements de la valeur nutritive de l’ingéré dans le temps. Comme le pâturage des chaumes intervient en même temps que le démarrage de la saison d’œstrus, la supplémentation en graines légumineuses riches en protéines dégradables est nécessaire pour éviter des inadaptations de l’état corporel. La supplémentation des chèvres sur broussaille par du PEG et le pâturage des moutons sur chaumes de céréales avec des apports modérés de graines de légumineuses permettent l’utilisation de ressources traditionnelles dans le cadre de système de production durable." @default.
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- W2028479954 date "2000-05-01" @default.
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- W2028479954 title "Utilization of low quality resources by small ruminants in Mediterranean agro-pastoral systems: the case of browse and aftermath cereal stubble" @default.
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