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The development of maintenance energy requirement and energetic efficiency for lactation from production data of lactating dairy cows

  • R. E. Agnew (a1), T. Yan (a1), J. J. Murphy (a2), C. P. Ferris (a1) and F. J. Gordon (a1)...

Extract

The energy feeding systems currently adopted for dairy cows in Western Europe and North America were developed from calorimetric data published 30 years ago. However, the calorimetric measurements were usually undertaken with a small number of trained animals, housed for a short period in respiration chambers. The objective of the present study was to use production data to develop the metabolisable energy (ME) requirement for maintenance (MEm) and the efficiency of ME use for lactation (kl) for dairy cows.

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References

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AFRC. 1993. Energy and protein requirements of ruminants. CAB International, Wallingford, Oxon, UK.
AFRC. 1990. Technical Committee on Responses to Nutrients, Report No 5. Nutrition Abstracts & Reviews-B 60: 729.
INRA. 1989. Ruminant nutrition - Recommended allowances and feed tables. John Libbey Eurotext, Paris.
NRC. 2001. Nutrient requirements of dairy cattle. Seventh revised edition, National Academy Press, Washington D. C.
SCA. 1990. Feeding standards for Australian livestock - Ruminants. CSIRO, Australia.
Van Es, A. J. H., 1978. Feed evaluation for ruminants. Livestock Production Science 5: 331345.

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