DEMOCRÁTICA
MEDIACIÓN TECNOPOLÍTICA EN EL PAPEL DE LOS MEDIOS EN UNA SEGUNDA TRANSICIÓN DEMOCRÁTICA ESPAÑOLA
3. Cambio de escenario: desanclajes y cierres de sistemas
• There is still need to examine time effect of maize silage supplementation on N
partitioning of grazing dairy cows with excess N intake (>400 g N/cow/day).
• Investigate the effect of supplementation time and feed restriction on animal
performance, compared with unrestricted and unsupplemented control group.
• Examine the effect of time of supplementation, using different types of supplement, on herbage DM intake, MS production, N partitioning and rumen function of grazing dairy cows under feed restriction situation.
6.3 Conclusions
• Time of maize silage supplementation can create different hunger levels and thereby motivate cows to eat more under herbage feed restriction strategy.
• Under situation of herbage feed restriction, feeding maize silage at 9 rather than 1 hour before an intensive herbage meal reduced SR and increased herbage DM intake. • Milksolids response per kg DM of supplement can be increased by feeding maize silage
at 9 rather than 1 hour before a short and intensive herbage meal.
• Nitrogen use efficiency is very sensitive to ME:N intake ratio for grazing dairy cows consuming <400 g of N/cow/day.
• Under a herbage feed restriction situation, maize silage supplementation did not dilute N intake; resulted in a small effect on urinary, faecal and milk N concentration and excretion.
• Under a herbage feed restriction situation, feeding 5 kg DM of maize silage 9 rather than 1 hour before the herbage meal increased propionate proportion and, hence, energy supply (glucose) of grazing dairy cows.
• High level of supplementation accompanied with high quality pasture is required to maintain performance of lactating dairy cows under acute herbage feed restriction strategy (4-5 hour access to the pasture).
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