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A low N use efficiency NUE is basically due to the incapacity of animals to build significant amounts of protein reserves, being necessary to adjust protein supply according to protein requirements Hoekstra et al. The effects of synchrony in MY and N excretion are not clear Newbold and Rust, 1992; Hristov and Jouany, 2005 and less important than expected Cabrita et al. Effect of strategies regarding concentrate supplementation and day-time grazing on N utilization at both field and dairy cow level. Although there was a difference in WSC content between HS and standard cultivars, the energy and CP content were similar, so the only difference between HS and standard cultivars was the ruminal CHO rate of degradation. Feed nitrogen conversion in lactating dairy cows on pasture as affected by concentrate supplementation. Effect of asynchronous nitrogen and energy supply on growth of ruminal bacteria in batch culture. Supplementation decreases pasture intake per cow, allowing increasing the stocking rate, and a higher milk yield per cow.

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Effects of increasing levels of grain supplementation on rumen environment and lactation performance of dairy cows grazing grass-legume pasture. Increase of water soluble carbohydrate concentration of the pasture Effect of agronomic management. A higher, but not significant, NUE average was observed when cows consumed HS cultivars, when comparing with values obtained with cows fed conventional cultivars 24. The milk response per kilogram of concentrate decreases as the amount of concentrate increases, being lower above 3-4 kg concentrate d -1 when pasture quality and quantity are not limiting. Another beneficial effect is that it decreases the proportion of urinary N in relation to fecal N, since the last one has a lower impact on the environment.

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