Use of different leguminous seeds for lactating goats. Amino acid composition of the raw material and the rumen degradable fraction

[EN] The suitability of different leguminous seeds (lupine, beans, bitter vetch and vetch) for the nutrition of goats was investigated. The ruminal degradability of the N in each protein source was estimated using the nylon bag technique. The amino acid composition of the original protein sources and of the residues in the bags after ruminal incubation was also determined. The beans had more (P<0.05) of the quickly degradable fraction of crude protein than did the other three leguminous seeds. Lupine seeds had a higher (P<0.05) rate of degradation than did the other protein sources. The lowest value for effective degradability was observed for bitter vetch. The overall change in the amino acid profile due to ruminal fermentation depended on the protein source provided. The amino acid profile of the different leguminous seeds was among them, more similar before ruminal fermentation. However, the profile of their rumen undegradable protein fractions resulted very different. When a multivariate analysis was carried out, organization of the leguminous seeds in the order of the intensity of change, yielded the following: lupine, beans, bitter vetch and vetch.[FR] Dans cette ètude a ètè analysèe líaptitude de líusage de diverses lègumineuses en graines (lupin, feve, ers et vesce), dans líalimentation de la chevre. La dègradabilitè du N de chacune des sources protèiques a ètè rèalisèe au moyen de la technique du sachet en nylon. De la mime faàon on a dèterminè la composition en acides aminès des sources originales de protèines et des rèsidus contenus dans le sachet. Par rapport aux trois autres lègumineuses, les feves ont prèsentè une fraction supèrieure (P<0,05) de protèines rapidement dègradables. Le lupin, lui, face aux trois autres lègumineuses, a prèsentè un taux de dègradation plus èlevè (P