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The ability of different feed evaluation systems to predict rumen microbial nitrogen flow of lactating dairy cows

  • B. Stefanon (a1), L. Gruber (a2), S. Moscardini (a1), V. Volpe (a1) and P. Susmel (a1)...

Extract

The contribution of rumen microorganisms to the protein absorbed in the intestine is a key factor to evaluate diets for ruminants, and the urinary excretion of purine derivatives (PD) has recently been proposed to estimate rumen microbial protein synthesis in cows (Verbic et al., 1990). This study refers to the relationship between PD excretion and the microbial nitrogen estimated according to recent protein systems for ruminants.

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AFRC Technical Committe on Responses to Nutrients. 1992. Report no. 9. Nutritive requirements of ruminant animals: protein. Nutrition Abstracts and Reviews (series B) 62/12: 787835.
CNAP, Commissione proteine nella Nutrizione e nell'Alimentazione dei Poligastrici. 1994. Valutazione degli alimenti di interesse zootecnico. 3. Degradabilità e valore proteico degli alimenti per i ruminanti. Zootecnica e Nutrizione Animate 20: 281291.
GEAB, Gesellschaft für Ernahrungphysiologie Ausschuss fur Bedarfsnormen. 1997. Zum proteinbedarf von milchkühen und aufzuchtrindern. Proc. Soc. Nutr. Physiol. 6: 217236.
Sniffen, C.J., O'Connor, J.D., Van Soest, P.J., Fox, D.G. and Russell, J.B. 1992. A net carbohydrate and protein system for evaluating cattle diets: II. Carbohydrate and protein availability. Journal of Animal Science 70: 35623577.
Verbic, J., Chen, X.B., MacLeod, N.A. and Ørskov, E.R. 1990. Excretion of purine derivatives by ruminants. Effect of microbial nucleic acid infusion on purine derivative excretion by steers. Journal of Agricultural Science, Cambridge 114: 243248.

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