Overstocking and a failure to maintain a healthy pasture led the National Park Service to end the grazing lease held by third-generation rancher Dan Genazzi, superintendent Craig Kenkel wrote in a letter last month. 

Mr. Genazzi, whose grandfather immigrated from Switzerland to Tomales at the turn of the last century, leased around 300 acres just east of Point Reyes Station. The land is part of the northern district of the Golden Gate National Recreation Area…