A normal blood clot consists of a clump of blood-born particles that have become stuck together inside a blood vessel; this usually occurs at the site of a blood vessel injury and is part of the normal healing process.
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BRD is a general term for respiratory disease in cattle caused by a range of factors, singly or in combination. A major cause of economic losses, BRD affects the lower respiratory tract / lungs (pneumonia) or upper respiratory tract (rhinitis, tracheitis, bronchitis).Etiology. BRD is defined as a âdisease complexâ: These pathogens interact with one another and the animalâs immune system to produce full-blown disease. 2  Bacterial pathogens apparently cause the acute syndrome by invading the bovine respiratory tract that has been compromised by viral infections, environmental conditions and/or other stress factors.