Energy balance and utilization in cows during and after excessive provision of protein. 3. Effect of an incorrect protein supply for lactating cows and its consequences

Kreuzer, M.; Muller, H.L.; Kirchgessner, M.

Zeitschrift fur Tierphysiologie, Tierernahrung und Futtermittelkunde 54(1): 41-54


ISSN/ISBN: 0044-3565
Accession: 001585455

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During 3 successive 21-day periods 18 lactating Simmental X Red Holstein Friesian cows had a 25% excess of dietary protein followed by standard supply or by 25% deficit, then standard supply, or (controls) had the standard amount throughout. All diets were equal in energy and other nutrients. With increased nitrogen intake water consumption increased. Water eliminated in faeces, urine and milk and by skin and lungs depended on N supply, but water retention did not. With excessive protein the reduced excretion of energy in faeces was almost balanced by increased output in urine, so only slightly more metabolizable energy (ME) was available than to controls. With deficient protein metabolizability of energy decreased by 4 percentage units. Incorrect protein supply had no after-effect. Heat production increased with rising dietary protein and there were residual effects. Output of milk energy was reduced by protein surplus or deficit and did not reach control value with subsequent standard supply. Utilization of ME for milk production was changed little by varying dietary protein.