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Table 3 Requirement and supply of energy and protein for different feed groups and diets either as calculated at a nutritional audit on the 29th of January (Metabolisable Energy and Protein) or as calculated during subsequent investigation of poor performance (Net Energy/Protein Digestible in the Small Intestine) on an Irish dairy farm.

From: An investigation into reduced milk production following dietary alteration on an Irish dairy farm

   Metabolisable Energy/Protein3 Net Energy/Protein Digestible in the Small Intestine4
Feed Group Requirements/Diet ME (MJ/day) MP (g/day) NE (UFL/day) PDIE (g/day) PDIN (g/day)
Early lactation cows1 (estimated yield 32 L2) Required 239 1849 19.38 1970 1970
  Used up to nutritional assessment 5306 2706 22.57 2543 2647
  Advised at nutritional assessment5 238 2177 17.13 1971 2123
Late lactation cows1 (estimated yield 16 L2) Required 153 1039 12.34 1195 1195
  Used up to nutritional assessment5 234 1609 17.43 1720 1625
  Advised at nutritional assessment5 154 1006 11.10 1028 1060
Dry cows1 (more than two weeks from calving) Required 88 436 NA NA NA
  Used up to nutritional assessment5 82 479 NA NA NA
  Advised at nutritional assessment5 82 479 NA NA NA
Dry cow1 (within two weeks of calving) Required 104 501 NA NA NA
  Used up to nutritional assessment5 82 479 NA NA NA
  Advised at nutritional assessment5 103 581 NA NA NA
  1. 1Body weight of all cows was evaluated at 650 kg. 2All milk production was evaluated at 3.20% protein and 4.00% fat. 3Calculated using RumNut V5.1a
  2. (Shedfield, Southampton, United Kingdom). 4Calculated using INRAtion-PrevAlim v3.3 (2006). 5See Tables 1 and 2 for diet composition and feedstuff nutrient values. NA = Not Applicable