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Milk production and N partitioning in early lactation dairy cows offered perennial ryegrass containing a high concentration of water soluble carbohydrates

  • J. M. Moorby (a1), L. A. Miller (a1) (a2), R. T. Evans (a3), N. D. Scollan (a1), M. K. Theodorou (a1) and J. C. MacRae (a4)...

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The efficiency of utilisation of grass nitrogen for milk protein production tends to be low, because rumen fermentable energy sources limit the amount of diet amino acids that are incorporated into microbial protein. As a consequence, absorption of ammonia from the rumen and excretion of high-N waste products is considerable. Previous studies (Miller et al., 1999) have shown that the efficiency of use of feed N can be increased in late-lactation dairy cows by feeding ryegrass bred to contain a high concentration of water soluble carbohydrates (WSC). The objective of this study was to investigate milk production and N partitioning in early lactation dairy cows using the same high WSC ryegrass variety, AberDove.

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Miller, L.A., Theodorou, M.K., MacRae, J.C., Evans, R.T., Adesogan, A.T., Humphreys, M.O., Scollan, N.D. and Moorby, J.M. 1999. Milk production and N partitioning responses in dairy cows offered perennial ryegrass selected for high water soluble carbohydrate concentrations. South African Journal of Animal Science 29 (ISRP): 321322.

Milk production and N partitioning in early lactation dairy cows offered perennial ryegrass containing a high concentration of water soluble carbohydrates

  • J. M. Moorby (a1), L. A. Miller (a1) (a2), R. T. Evans (a3), N. D. Scollan (a1), M. K. Theodorou (a1) and J. C. MacRae (a4)...

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