[Influence of low energy alimentation and nitrogen on free amino acids in the blood of dairy cows at the beginning of lactation]. / Influence d'une sous-alimentation énergétique et azotée sur l'aminoacidémie libre de vaches laitières en début de lactation.

ABSTRACT

Dairy cows are fed low energy and adequate nitrogen (T), or low energy and low nitrogen (C) diets. Blood free aminoacids, urea and glucose are estimated. The relations between gluconeogenesis, protein catabolism, liveweight and milk production are discusssed.