Energy balance and energy utilization of lactating cows with restricted protein supply and subsequent refeeding

Rohrmoser, G.; Muller, H.L.; Kirchgessner, M.

Zeitschrift fur Tierphysiologie, Tierernahrung und Futtermittelkunde 50(4/5): 216-224


ISSN/ISBN: 0044-3565
Accession: 001194230

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During 4 weeks 4 cows (control) had 14.5% crude protein in total ration DM and, by interchange of cassava meal and soya bean oilmeal, their monozygotic twins had 12.0%. Faeces, urine and milk were collected during 8 days, also at both stages of the subsequent 6-week refeeding period. During period 1 the depleted cows excreted 7.3% more energy in faeces, but 20% less in urine, and produced 8.4% less methane than the controls. The depleted and controls metabolized 55.6 and 57.5% of total energy. With refeeding the previously depleted did not differ from the controls. Energy excreted in milk was reduced by 2.8 MJ daily, or 6.1%, during depletion, milk energy representing 33.1 and 33.6% of metabolizable energy in the depleted and controls. The groups did not differ significantly during refeeding. Retention of energy in period 1 reached 4.9 MJ daily in both groups. With refeeding utilization of metabolizable energy for retention and milk production tended to be slightly more in the previously depleted. In all 3 periods heat production, as KJ/kg0.75, was slightly less in the depleted.