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.
The heart contains two upper chambers called atria and two lower chambers called ventricles. The left and right sides of the heart are separated by the septum. Valves prevent the backflow of blood and separate the atria from the ventricle and the ventricle from the pulmonary artery or aorta. Key Terms