TAILIEUCHUNG - Black's veterinary dictionary 21st edition - P

Từ điển thú y vần P | P Pacemaker An electronic device implanted under the skin of the chest which stimulates the heartbeat. Pacemakers have been successfully implanted into dogs which show an impaired conduction of the impulse that regulates the heartbeat so that a lack of coordination between the beating of the atria and that of the ventricles occurs. Following repeated episodes of loss of consciousness which heart medication failed to obviate a 2-year-old dachshund in Switzerland had a pacemaker electrode inserted into the right ventricle of its heart via the jugular vein. The batteries were inserted between abdominal muscles. Local irritation from the battery implant was stated to be slight. Two years later the heart had given no further trouble. A pacemaker was inserted in a pregnant mare at the Royal Veterinary College. The mare foaled normally and she and the foal fared well. Pacheco s Disease Pacheco s disease is caused by a herpesvirus which is present in South American psittacines parrots parakeets . In the wild it does not appear to cause any harm. In aviaries however sudden onset of disease and death may occur with up to 100 per cent mortality. The birds become weak and have diarrhoea. Post-mortem examination shows necrosis of the liver and spleen. Pachymeningitis Inflammation of the dura mater of the brain and spinal cord. See MENINGITIS. Pacinian Corpuscles see under TOUCH SKIN Packed Cell Volume see under BLOOD - Composition Paddocks These often become reservoirs of parasitic worm larvae a point for animal-owners to bear in mind. Paddocks need resting for 12 months or grazing by a different species of animal periodically. Pain For relief of pain see ANALGESICS ANAESTHESIA. Animals which are natural hunters predators may cry out when suffering pain. Species which are or were normally hunted may not do so because it would reveal that they are injured or hiding. Thus because an animal does not cry out or show signs of restlessness it should not be assumed that it is free .

• Nông nghiệp
• tự điển thú y
• động vật học
• bệnh động vật
• nghiên cứu động vật
• tài liệu chăn nuôi