Pollock Jessica G, Gordon Alan W, Huson Kathryn M, McConnell Deborah A
School of Biological Sciences, Queens University Belfast, Belfast BT9 7BL, UK.
Agri-Food and Biosciences Institute, Large Park, Hillsborough BT26 6DR, UK.
Animals (Basel). 2020 Nov 21;10(11):2176. doi: 10.3390/ani10112176.
Pasture allocation frequency (PAF) can influence pasture availability and grazing behaviour, which subsequently may impact on animal performance. Limited research to-date has investigated grazing management methods to improve the performance of high production dairy cows whilst also achieving high grass utilisation rates. This study evaluated the effect of three different PAF's (12, 24 and 36 h) on pasture utilisation, the performance of high yielding dairy cows and the interaction with parity. The experiment included two 60-day periods, 90 spring calving dairy cows (27 primiparous animals) in period one and 87 (24 primiparous animals) in period two. The average pre-grazing sward height (11.4 cm) was similar for all treatments in both periods. In period one, pasture utilisation rate was significantly higher (8%) in the 36 h compared to the 12 h treatment. In period two, milk energy output was significantly greater for primiparous animals in the 36 h treatment relative to the other treatments.
牧场分配频率（PAF）会影响牧场可利用性和放牧行为，进而可能对动物生产性能产生影响。迄今为止，仅有有限的研究探讨了放牧管理方法，旨在提高高产奶牛的生产性能，同时实现较高的牧草利用率。本研究评估了三种不同的PAF（12小时、24小时和36小时）对牧草利用率、高产奶牛生产性能以及与胎次相互作用的影响。试验包括两个60天的时间段，第一个时间段有90头春季产犊奶牛（27头初产动物），第二个时间段有87头（24头初产动物）。两个时间段内，所有处理的平均放牧前草层高度（11.4厘米）相似。在第一个时间段，与12小时处理相比，36小时处理的牧场利用率显著更高（8%）。在第二个时间段，相对于其他处理，36小时处理的初产动物的牛奶能量产出显著更高。
