A new system for the protein feeding of ruminants: The PDI system

Effect of Barley or Rape Seed Cake as Supplement to Silage for High-Yielding Organic Dairy Cows

“…The rape seed cake ration contained 80 g AAT:SFU versus 78 g in the barley ration on farm A, and 91 g versus 85 g AAT:SFU on farm B. However, the AAT difference between treatments was larger according to the French PDI system (Verite et al, 1979). This is because the Nordic AAT-PBV system relates the microbial protein synthesis to the amount of digested carbohydrates, whereas the French system relates to digested organic matter, which results in a higher estimation of the protein value of concentrates rich in fat and protein.…”

The Influence of Diet on Nitrogen and Amino Acid Content of Mixed Rumen Bacteria

“…In the new systems for protein evaluation proposed during recent years (Verite et al, 1979;ARC, 1984;hladsen, 1985) the amount of microbial protein or microbial amino acids entering the duodenum is one of the key factors. Furtherlhe amino acid content of the microbial protein produced in the rumen is also a factor of importance in converting the microbial protein to amino acids available for digestion in the lower gut o r to calculate the microbial protein synthesis in the rumen from the flow of microbial amino acids to the small intestine.…”

Chemical methods for predicting the energy and protein value of forages

“…1977) and closely related to N disappearance in a dacron bag suspended in the rumen (C RAWFORD et al, 1978) or to NH 3 production in an in vitro incubation with rumen digesta (V ERITE and D EMARQUILLY , 1978) (fig. 9) (TanttvnNCn, 1979 The latter position has been adopted by research groups in different countries, U.S.A. (B URROUGHS et al, 1975 ;S ATTER and R OFFLER , 1975), United Kingdom (RoY et ccl., 1977), Western Germany (K AUFMANN , 1977), France (J ARRIGE et al, 1978 ;V ERITE et al, 1979). In spite of being incomplete at present, the new systems overcome most of the DCP system shortcomings.…”