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The influence of cow genetic merit for milk production on response to level of concentrate supplementation in a grass based system

  • P. Dillon (a1), J. Kennedy (a1), P. Faverdin (a2), L. Delaby (a2), F. Buckley (a1) and M. Rath (a3)...

Extract

Pre-1990 published responses to supplementation at pasture ranged from 0.4 to 0.6kg milk/kg concentrate fed. However since 1990 higher responses to concentrate supplementation at pasture have been published (Delaby 2001). The objective of this study was to determine if milk production responses of Holstein-Friesian dairy cows to concentrate supplementation at pasture are influenced by genetic merit (milk yield potential) in a spring calving grass based system of milk production.

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Delaby, L., Peyraud, J. L. and Delagarde, R. 2001. Effect of the level of concentrates supplementation, herbage allowance and milk yield at turn out on the performance of dairy cows in mid lactation at grazing. Animal Science 73: 171181.
Tyrell, H. F. and Reid, J. T. 1965. Prediction of the energy value of cow’s milk. Journal of Dairy Science 48: 12151223.

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