Effects of herbage composition and supplement feeding on the excretion of nitrogen in dung and urine by grazing dairy cows
AM Van Vuuren, JAC Meijs - Animal Manure on Grassland and Fodder …, 1987 - Springer
AM Van Vuuren, JAC Meijs
Animal Manure on Grassland and Fodder Crops. Fertilizer or Waste? Proceedings …, 1987•SpringerTheoretically 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
intensively managed pastures, is 15 to 25%. When young leafy grass is the sole feed this
figure cannot be altered substantially without reducing animal performance. Supplementing
the diet of grazing dairy cows with a low-protein, high-energy feed (special concentrates or
maize silage) increases the efficiency of N utilization, mainly because it lowers N intake. First …
a maximum efficiency of 40–45%. The actual efficiency of N utilization in cows grazing
intensively managed pastures, is 15 to 25%. When young leafy grass is the sole feed this
figure cannot be altered substantially without reducing animal performance. Supplementing
the diet of grazing dairy cows with a low-protein, high-energy feed (special concentrates or
maize silage) increases the efficiency of N utilization, mainly because it lowers N intake. First …
Abstract
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 intensively managed pastures, is 15 to 25%. When young leafy grass is the sole feed this figure cannot be altered substantially without reducing animal performance. Supplementing the diet of grazing dairy cows with a low-protein, high-energy feed (special concentrates or maize silage) increases the efficiency of N utilization, mainly because it lowers N intake. First results using maize silage indicate an improvement in N utilization of 25 to 30%.
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