The Dutch protein evaluation system: the DVE/OEB-system

Abstract In 1991 a new protein evaluation system replaced the Digestible Crude Protein (DCP) system in the Netherlands: the DVE/OEB-system. The system was mainly developed with the aim to prevent avoidable losses of nitrogen, by feeding according to more exactly defined requirements of dairy cows. A second aim was to predict milk protein production more accurately. Protein requirements for maintenance, milk protein production, growth, mobilisation, metabolic losses in the digestive tract and gestation are expressed in DVE, the sum of digestible feed and microbial true protein available in the small intestine. In the system each feed has a DVE-value composed of the digestible true protein contributed by feed protein escaping rumen degradation (1), microbial protein synthesized in the rumen (2) and a correction for endogenous protein losses in the digestive tract (3). Each feed also has a degraded protein balance (OEB) reflecting the difference between the potential microbial protein synthesis based on degraded feed crude protein and that based on energy available for microbial fermentation in the rumen. The framework of the new system is based on what are considered strong elements of other recently developed protein evaluation systems. Additionally new elements are introduced, including undegraded starch (USTA), fermentation products (FP) in ensiled feeds, the role of energy balance in protein supply and the way in which requirements change in the course of lactation. Data within the framework of the system are mainly of Dutch origin. This is particularly true for the regression equations developed to predict the protein values of forages and protein values of a number of by-product ingredients.

[1]  L. Wageningen,et al.  Eiwitwaardering voor herkauwers: het DVE-systeem , 1991 .

[2]  H. H. Van Horn,et al.  Comparison of different methods of expressing dietary protein for lactating dairy cows. , 1988, Journal of Dairy Science.

[3]  P. V. Van Soest,et al.  Effect of carbohydrate limitation on degradation and utilization of casein by mixed rumen bacteria. , 1983, Journal of dairy science.

[4]  E. R. Ørskov,et al.  The estimation of protein degradability in the rumen from incubation measurements weighted according to rate of passage , 1979, The Journal of Agricultural Science.

[5]  A. V. van Vuuren,et al.  Protein digestion and intestinal amino acids in dairy cows fed fresh Lolium perenne with different nitrogen contents. , 1992, Journal of dairy science.

[6]  J. Nocek,et al.  Site of digestion of starch in the gastrointestinal tract of dairy cows and its effect on milk yield and composition. , 1991, Journal of dairy science.

[7]  S. Tamminga,et al.  Amino acid utilisation by dairy cows. II. Concept of amino acid requirements , 1980 .

[8]  L. Bongers,et al.  Apparent and true digestibility of protein and amino acids in the small intestine of sheep as related to the duodenal passage of protein and non-protein dry matter. , 1989 .

[9]  J. Russell,et al.  Protein and Energy as an Integrated System. Relationship of Ruminal Protein and Carbohydrate Availability to Microbial Synthesis and Milk Production , 1988 .

[10]  H. M. Schwartz,et al.  The Influence of Diet and Protozoal Numbers on the Breakdown and Synthesis of Protein in the Rumen of Sheep , 1986 .

[11]  R. Dumont,et al.  Early calving heifers versus maiden heifers for beef production from dairy herds. I. The effects of genotype (Friesian and Charolais × Friesian) and two feeding levels in the rearing period on growth and carcass quality , 1987 .

[12]  M. Spanghero,et al.  Performance of lactating simmental cows fed two diets differing in the content of digestible intestinal protein (PDI) , 1991 .

[13]  S. Tamminga,et al.  Protein degradation of ruminant diets. , 1990 .

[14]  J. Macrae.  4 – NUTRIENT INTERACTIONS IN THE DAIRY COW , 1988 .

[15]  D. Armstrong,et al.  Milk production in early lactation dairy cows given grass silage ad libitum : Influence of concentrate energy source, crude protein content and level of concentrate allowance , 1988 .

[16]  E. Storm,et al.  The nutritive value of rumen micro-organisms in ruminants , 1983, British Journal of Nutrition.

[17]  A. M. Vuuren,et al.  Degradation of nitrogenous compounds in conserved forages in the rumen of dairy cows. , 1991 .

[18]  T. Hvelplund.  INTESTINAL DIGESTION OF PROTEIN IN DAIRY COWS , 1984 .

[19]  M. Bosch.  Influence of stage of maturity of grass silages on digestion processes in dairy cows , 1992 .

[20]  J. Rooke,et al.  The effect of in sacco rumen incubation of a grass silage upon the total and D-amino acid composition of the residual silage dry matter , 1984, The Journal of Agricultural Science.

[21]  T. Hvelplund.  The Influence of Diet on Nitrogen and Amino Acid Content of Mixed Rumen Bacteria , 1986 .

[22]  D. Waldo,et al.  Comparison of New Protein Systems for Lactating Dairy Cows , 1984 .

[23]  J. Fadel,et al.  Evaluation of mathematical models to describe neutral detergent residue in terms of its susceptibility to degradation in the rumen. , 1986 .

[24]  M. Durand,et al.  Influence of major minerals on rumen microbiota. , 1988, The Journal of nutrition.

[25]  G. Hazlewood,et al.  A comparison of methods for the estimation of the proportion of microbial nitrogen in duodenal digesta, and of correction for microbial contamination in nylon bags incubated in the rumen of sheep , 1984, British Journal of Nutrition.

[26]  E. Storm,et al.  The nutritive value of rumen micro-organisms in ruminants , 1983, British Journal of Nutrition.

[27]  P. V. Soest,et al.  A net carbohydrate and protein system for evaluating cattle diets: I. Ruminal fermentation. , 1992, Journal of animal science.

[28]  Y. V. D. Honing,et al.  III. 2. Ruminants , 1988 .

[29]  R. Christopherson,et al.  The effect of cold exposure of sheep on digestion, rumen turnover time and efficiency of microbial synthesis. , 1976, The British journal of nutrition.

[30]  J. Madsen.  Influence of Feeding Level on Digestion and Protein Passage to the Duodenum in Cows Fed High Concentrate Diets , 1986 .

[31]  S. Tamminga,et al.  Nutrition Management of Dairy Cows as a Contribution to Pollution Control , 1992 .

[32]  P. H. Robinson,et al.  Influence of rumen undegradable protein levels on feed intake and milk production of dairy cows. , 1991, Journal of dairy science.

[33]  Allen Jd,et al.  The effect of the dietary addition of Monensin upon digestion in the stomachs of sheep. , 1979 .

[34]  S. Tamminga,et al.  Amino acid utilization by dairy cows. I. Methods of varying amino acid supply , 1980 .

[35]  A. P. Williams,et al.  The degradation of different protein supplements in the rumen of steers and the effects of these supplements on carbohydrate digestion , 1988, British Journal of Nutrition.

[36]  J. Oldham.  Protein-energy interrelationships in dairy cows. , 1984, Journal of dairy science.

[37]  C. Koelen,et al.  Ruminal behaviour of structural carbohydrates, non-structural carbohydrates and crude protein from concentrate ingredients in dairy cows. , 1990 .

[38]  J. Lindberg,et al.  In Sacco Degradability of Protein (N) and Dry Matter in Samples of Individual Feeds or Combinations; Tested with Diets Medium or High in Protein , 1985 .

[39]  J. H. Clark,et al.  Microbial protein synthesis and flows of nitrogen fractions to the duodenum of dairy cows. , 1992, Journal of dairy science.

[40]  Y. S. Rijpkema,et al.  Validation of protein evaluation systems by means of milk production experiments with dairy cows. , 1994 .

[41]  P. V. Soest,et al.  A net carbohydrate and protein system for evaluating cattle diets: III. Cattle requirements and diet adequacy. , 1992, Journal of animal science.

[42]  P. H. Robinson,et al.  Protein and fiber digestion, passage, and utilization in lactating cows. Microbial growth and flow as influenced by dietary manipulations. , 1987, Journal of dairy science.

[43]  D. Morgan,et al.  Effect of supplementary crude protein level and degradability in grass silage-based diets on performance of dairy cows, and digestibility and abomasal nitrogen flow in sheep. , 1990 .

[44]  S. Tamminga,et al.  Efficiency of milk protein production in the DVE protein evaluation system , 1994 .

[45]  E. Storm,et al.  The nutritive value of rumen micro-organisms in ruminants , 1983, British Journal of Nutrition.

[46]  P. H. Robinson,et al.  Rumen Ingesta Kinetics of Cell Wall Components in Dairy Cows , 1989 .

[47]  M. Kreuzer.  Ruminant nitrogen usage , 1986 .

[48]  P. H. Robinson,et al.  Influence of declining level of feed intake and varying the proportion of starch in the concentrate on rumen ingesta quantity, composition and kinetics of ingesta turnover in dairy cows , 1987 .

[49]  J. Russell,et al.  Microbial rumen fermentation. , 1981, Journal of dairy science.

[50]  P. V. Soest.  Nutritional Ecology of the Ruminant , 1994 .

[51]  P. Garnsworthy.  The interaction between dietary fibre level and protein degradability in dairy cows , 1989 .

[52]  M. Dhanoa,et al.  Comparison of methods to describe the kinetics of digestion and passage of fibre in sheep , 1986 .

[53]  A.J.H. Van Es,et al.  Feed evaluation for ruminants. I. The systems in use from May 1977-onwards in The Netherlands , 1978 .

[54]  T. Hvelplund,et al.  Digestibility of Individual Amino Acids in Rumen Microbial Protein and Undegraded Dietary Protein in the Small Intestine of Sheep , 1987 .

[55]  R. Axford,et al.  The digestibility of amino acids in the small intestine of the sheep , 1981, British Journal of Nutrition.

[56]  P. V. Soest,et al.  A net carbohydrate and protein system for evaluating cattle diets: II. Carbohydrate and protein availability. , 1992, Journal of animal science.

[57]  J. Nolan,et al.  Fermentation and nitrogen dynamics in Merino sheep given a low-quality-roughage diet , 1979, British Journal of Nutrition.

[58]  G. Broderick,et al.  Expeller soybean meal and corn by-products versus solvent soybean meal for lactating dairy cows fed alfalfa silage as sole forage. , 1990 .

[59]  A.J.H. Van Es,et al.  Feed evaluation for dairy cows , 1975 .

[60]  T. Hvelplund.  Digestibility of rumen microbial protein and undegraded dietary protein estimated in the small intestine of sheep and by in sacco procedure [nylon bag technique, amino acids absorbable in the small intestine (AAT)] , 1985 .