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Investigations of the influence of the content of plant crude protein in the ration on the utilisation of urea in dairy cattle. 5. 15N-fractions in the blood of lactating cows given 15N-urea intraruminantly.
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T. Motyl
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G. Kulasek
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W. Barej
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A. Sommer
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H. Bergner
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R. Görsch
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J. Vančišin
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