Many diseases in humans and animals are caused by agents which cannot be seen through the ordinary microscope. However, they can be visualized with the help of electron microscope, and their infectious nature proved by inoculating into susceptible hosts or into a suitable cell-culture system-a suspension of the diseased tissues or body fluids that have
Breed refers to a group of domestic fowls with a common ancestry, and having similarity in shape, conformation, growth, temperament, shell colour of egg and breed true to type. Variety is a subdivision of a breed and within a breed, there may be several varieties. The term variety is used to distinguish fowls having the
“Guide to Pig Breeds and Selection for Farming” India has a population of about 5 million pigs, which is less than 1 percent of the world population. According to an estimate made in 1968 by the Directorate of Marketing and Inspection, the annual production of pork and pork products is about 50,000 tonnes, which is
“Poultry Production: A Guide to Raising Chickens” The term poultry includes a number of avian species such as chicken, ducks, turkeys, geese, guinea-fowls and peafowls which have been domesticated but is very often used as synonymous to chicken. Most of these species thrive well under a variety of agroclimatic conditions and can be raised successfully
Good milch breeds differ from one another in their breed characters, such as the color, shape of head and cars, size, and coat, but certain general features may be recognized as being constant in the majority of these breeds. These are described below. Head The head should be long and of moderate width, with a