Year: 2003
Type: article
Abstract: Proteins in forage legumes are rapidly degraded in the rumen, inducing a poor dietary protein efficiency, risk of bloat, and nitrogen loss detrimental to the environment.The aim of this study was to investigate the variation in ruminal protein degradability among legume species and cultivars.Four species, each represented by 1 to 16 cultivars, were studied: lucerne (Medicago sativa), white clover (Trifolium repens), birdsfoot trefoil (Lotus sp.) and crownvetch (Coronilla varia).In a first experiment, forage samples of 16 cultivars of lucerne harvested in the autumn of 1998 were incubated in nylon bags in 3 fistulated cows in order to obtain the kinetics of ruminal degradation of crude protein and dry matter.The phenotypic variation in crude protein degradation was not significant, and was partly related to the dry matter degradation.In a second experiment, lucerne (5), birdsfoot trefoil (5), white clover (4) and crownvetch (1) cultivars were harvested in two cuts in 2000, and dry matter and crude protein degradation were analysed at 3 incubation times (2, 8 and 48 h) in the rumen of the fistulated cows.Crude protein degradation was higher for lucerne than for white clover, and these two tannin-free species exhibited greater crude protein degradation than crownvetch and birdsfoot trefoil.In birdsfoot trefoil, crude protein degradation was negatively correlated to condensed tannin content but positively correlated to dry matter degradation.Except for birdsfoot trefoil, the range of genetic variation within species for in situ crude protein degradation was low.protein degradation / dry matter degradation / Medicago sativa / Lotus sp./ Trifolium repens / Coronilla varia Résumé -Variabilité pour la dégradabilité des protéines de légumineuses fourragères.Les protéines des légumineuses fourragères sont rapidement dégradées dans le rumen, conduisant à une faible efficacité des protéines de la ration, des risques de météorisation et des pertes d'azote polluant l'environnement.L'objectif de cette étude était d'évaluer la variabilité de la dégradabilité ruminale des protéines entre espèces et cultivars de légumineuses fourragères.Quatre espèces, chacune représentée par 1 à 16 cultivars, ont été étudiées : la luzerne (Medicago sativa), le trèfle blanc (Trifolium repens), le lotier corniculé (Lotus sp.) et la coronille (Coronilla varia).Dans une première expérience, 401
Source: Animal Research
Institution: Institut National de la Recherche Agronomique
Language: English
Subfield: Animal Science and Zoology
Domain: Life Sciences
SDG: Zero hunger
Open Access status: bronze
OpenAlex ID: W2113986175