These are two very useful papers that deal with the impact of the early 14th century cattle plagues on English manors:
Newfield, T. 2009. A cattle panzootic in early fourteenth-century Europe. Agricultural History Review 57, 155-190.
Slavin, P. in press. The great bovine pestilence and its economic and environmental consequences in England and Wales, 1318-1350. Economic History Review DOI: 10.1111/j.1468-0289.2011.00625.x