breeding pad
n.— «As beef cattle grow and mature, rump fat is an early developing fat tissue. Textbooks of beef cattle anatomy often refer to it as the “breeding pad,” a protective fat Mother Nature put in place for mating, making the process more comfortable for both bull and cow alike.» —“Carcass Ultrasound 101: The importance of ultrasound rump fat” by Patrick Wall High Plains/Midwest Ag Journal (Dodge City, Kansas) Jan. 14, 2008. (source: Double-Tongued Dictionary)