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Urea and allantoin in the milk of cows during and after excess of energy supply 5. communications on the influence of excessive energy supply of lactating cows and its consequences



Urea and allantoin in the milk of cows during and after excess of energy supply 5. communications on the influence of excessive energy supply of lactating cows and its consequences



Journal of Animal Physiology and Animal Nutrition 58(3): 147-156



Contents of protein, urea and allantoin in milk as affected by different energy supply were measured in an experiment with four pairs of monozygotic twin cows. During four weeks one partner of each pair get an energy surplus of 20 MJ NEL, whereas the other was fed according to the German standard. In order to investigate residual effects, in subsequent periods of 4 weeks duration both groups were fed to standard. This action was replicated in a later stadium of lactation. In comparison to the control group an energy surplus of 13% and 16% was reached, respectively. Crude protein content was not affected, concentration of allantoin in milk increased only slightly by 0.13 mg/100 ml milk. Concentration and percentage of urea-N in milk-N decreased to 65% and 69% of control values. The urea content was mainly determined by the relationship between protein and energy in the ration. Regression calculation also showed, that increasing the energy supply in case of constant N intake decreases the excretion of urea-N, but increases the excretion of allantoin-N. Unequivocal residual effects could not be observed.

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