A baby cow is called a calf. Adult male cows are called bulls. Adult female cows are called heifers until they give birth; after they have given birth, they are called cows.
As long as there is a fuel supply of natural gas or propane, a well-maintained backup generator will keep running. If the Generac generator is running on propane, with a 500-gallon tank, it should run 24 hours a day for over a week. How loud are they? Generac generators are very quiet.
By end of the 1980s, the company was manufacturing residential, commercial and industrial generators, and in 1989, Generac introduced the first gaseous-fueled automatic home standby system. In 1992, Generac began private labeling generator sets for Caterpillar, Inc.