In the beef cattle diet, common roughages include hay, silage and grass. Silage is a crop that has been preserved in a moist, succulent condition by partial fermentation in a tight container (silo) above or below ground. The majority of the food cattle eat comes from this type of feedstuffs.
Birds (some dinosaurs) and mammals have a four-chambered heart. The ventricle is divided by a septum into two compartments completely separating oxygenated from deoxygenated blood and delivering the maximum amount of oxygen to the head and body at the most efficient pressure.
Figure 1: The components of the heart's electrical system are illustrated here. From an electrical standpoint, the heart can be thought of as being divided into two portions: the atria (upper chambers), and the ventricles (lower chambers). Separating the atria from the ventricles is a fibrous disc.