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



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



Zeitschrift fuer Tierphysiologie Tierernaehrung und Futtermittelkunde 50(4-5): 216-224



A respiration experiment with 4 pairs of monozygoting twin cows was conducted to determine the effect on the utilization of energy of a 17% deficiency of crude protein for 4 wk. During a subsequent period of realimentation of 3 wk with slight oversupply and a further period of 3 wk with nutrient supply adjusted to lactation trend permanent responses associated with the previously protein undernutrition were examined. On isocaloric energy intake the protein deficient ration resulted in a higher fecal energy by 7.3%. In contrast the excretion of urine energy was substantially reduced by 20% and that of methane by 8.4%. The metabolizability of energy reached 55.6% in protein deficiency compared to 57.5% in the control animals. After realimentation these criteria did not differ between the cows previously protein-deficient and the control twins. Protein deficiency lowered the excretion of milk energy by 2.8 MJ/d (6.1%). However, milk energy related to metabolizable energy was nearly the same in both groups, 33.1% on the protein-deficient ration and 33.6% on the control ration. Body tissue energy was not affected during the protein restrictive phase and averaged to 4.9 MJ/d. Therefore, deficiency of crude protein did not influence the partial efficiency of energy retention (milk + tissue energy) from metabolizable energy. After realimentation there was a tendency to slightly higher partial efficiency in the previously undersupplied cows compared to the control cows. In consequence of advanced pregnancy the efficiency of utilization of energy decreased by about 5% points towards the end of the last experimental period.

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Related references

Energy balance and energy utilization of lactating cows with restricted protein supply and subsequent refeeding. Zeitschrift fur Tierphysiologie, Tierernahrung und Futtermittelkunde 50(4/5): 216-224, 1983

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