Год выпуска: 2013 Автор: Amer Makram Издательство: LAP Lambert Academic Publishing Страниц: 164 ISBN: 9783659430121
Описание
Since the 1950s, breeding companies have been selecting commercial broilers for more rapid growth and higher meat yield, with a consequent increase in growth rate of about 5% a year. Rapid growth results from increased feed intake per unit of time and a higher metabolic rate and consequently leads to a higher demand for O2 . It has been estimated that 8% of 361,000,000 broiler deaths each year can be attributed to ascites. Ascites syndrome (AS) is an accumulation of fluid in abdominal cavity and the lay term ' water bally 'is an appropriate description of its appearance as affected chickens In 2002, it was estimated that these on-farm late grow-out mortalities cost more than 100 million dollar per year in the United States. In addition, 0.05% of all processing plant condemnations can be attributed to ascites . objective of this dissertation was to investigate the immunological, hematological and morphological changes associated with ascites in four broiler strains, and the genetic...
