Utilisation des acides gras non estérifiés plasmatiques pour la prévision des bilans et besoins énergétiques de la chèvre en lactation

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Abstract
Plasma levels of nonesterified fatty acids (NEFA) and .beta.-OH-butyrate were determined 7 times during mid-lactation in 12 dairy goats, housed in balance crates. An accurate determination of ingested milk net energy, by in vivo digestibility measurements combined with an analysis of blood components, clearly show the usefulness of using NEFA to predict the energy balance. Milk net energy intake can be determined from the NEFA content, live weight and level of fat corrected milk production. The advantage of these methods as compared to the previous ones is a good estimation of the energy balance during short experimental periods without determination of live weight changes.