JOHNE'S DISEASE. BVD (Bovine Virus Diarrhea) infection can cause numerous problems, such as damage to the digestive and immune systems, pneumonia, abortions, calf deformities, and others. Clinical signs in newborn calves infected with BVD include fever, nasal discharge, diarrhea, and inability to move about normally.
Ultrasonic Flow meter is a device used to measure the velocity of the fluid with the help of ultrasound transducers to compute volume flow of the fluid. This flow meter measures average velocity of the fluid with the use of sound waves. Working Principle of Ultrasonic Flow Meters-.
Ultrasonic pest repellers as the name implies, use ultrasound which basically means sound of more than 20,000 Hz. This frequency of sound is practically undetectable by the human ear.