Effects of herbage composition and supplement feeding on the excretion of nitrogen in dung and urine by grazing dairy cows
作者： A. M. Van Vuuren , J. A. C. Meijs
DOI: 10.1007/978-94-009-3659-1_2
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摘要: Theoretically a 600 kg cow producing 25 kg milk per day can utilize dietary nitrogen (N) with a maximum efficiency of 40–45%. The actual efficiency of N utilization in cows grazing …
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