The economic effect of ill health.
D000818:Animals; D001353:Avian Leukosis / Q000517:prevention & control; D002645:Chickens; D003365:Costs and Cost Analysis; D004467:Economics; D004531:Eggs; D004739:England; D004813:Epidemiology; D005856:Germ-Free Life; D009521:Newcastle Disease / Q000517:prevention & control; D011200:Poultry; D011201:Poultry Diseases / Q000517:prevention & control; D011202:Poultry Products; D014730:Veterinary Medicine; D014852:Wales