Energy balance and energy utilization of lactating cows under restricted energy supply and subsequent re alimentation

Kirchgessner, M.; Roehrmoser, G.; Mueller, H.L.

Zeitschrift fuer Tierphysiologie Tierernaehrung und Futtermittelkunde 49(4-5): 228-238


Accession: 005360970

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A respiration experiment with 4 pairs of monozygotic twin cows was conducted to study the effects of a 15% deficiency of gross energy for 4 wk caused by reduced concentrate supply on various criteria of energy metabolism. During a following period of realimentation of 3 wk with a slight oversupply the reversibility of the changes was tested. Energy deficiency caused relatively higher losses of urine energy and methane; the digestibility of energy was not affected. The metabolizability of energy amounted to 54.9% in the energy restricted cows and to 57.4% in the control animals. The milk energy excretion was 47.5 MJ/d and 52.1 MJ/d in energy deficiency and control feeding, respectively. The mobilization of body energy to the amount of 9.6 MJ/d compensated for half of the deficit in energy supply, so that the fall in milk yield was only 2.8 kg/d. The partial utilization of efficiency of metabolizable energy for milk production was slightly lowered in the undersupplied cows compared to the control cows. After realimentation no relevant residual effects on all the criteria were observed. The partial efficiency of ingested metabolizable energy in milk energy was 62%.