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A method of measuring the nitrogen balances from dairy cows under loose housing conditions

, : A method of measuring the nitrogen balances from dairy cows under loose housing conditions. Archiv fuer Tierzucht 39(4): 361-368

For the statistical analysis 563 daily nitrogen balance data (n=563) from 38 high yielding dairy cows were used. The investigations were taken on the dairy research farm "Karkendamm" of the Institute of Animal Breeding of the Institute of Animal Breeding and Husbandry of the Christian-Albrecht's-University of Kiel. On average 94 per cent of the nitrogen input (N in concentrates, N in roughage) was found in the nitrogen output (N in milk, N in urine, N in faeces). The intake of concentrates and roughage and the milk performance were recorded automatically. The N-output in faeces was estimated with two indirect methods. Urine was collected with a harness specially developed for this trial. The developed methods offers the possibility of balancing other nutrients as well. By modification of the methods it would be possible to include a greater number of animals in the investigations.

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