The number of retailers who directly deal with poultry farmers recently increases in Japan. It therefore becomes necessary for the poultry farmers to deliver products to the retailers frequently in accordance with the retailers’ demand. The poultry farmer’s inventory level increases due to the increase in the weight of the fowls, but at the same time, it decreases due to loss of the commercial ...

Tuberculin from the human and from the bovine type of tubercle bacilli inhibits the growth of cells from explants of bone marrow, spleen and testes of tuberculous guinea pigs, and is toxic for these cells, but has no effect on explants of the same tissues from non-tuberculous animals. "Tuberculin" from other acid-fast bacteria has no inhibitory or toxic action on explants of tissues from either...

Farm animal welfare has been gradually recognized as an important issue in most parts of the world. In China, domestic animals were traditionally raised in backyard and treated as an important component of family wealth. Industrialization of animal production brings forth the farm animal welfare concerns recently in China, yet the modern concept of animal welfare has not been publicized and a c...

Probiotics are live microbial feed supplements that promote growth and health to the host by minimizing non-essential and pathogenic microorganisms in the host's gastrointestinal tract (GIT). The campaign to minimize excessive use of antibiotics in poultry production has necessitated development of probiotics with broad application in multiple poultry species. Design of such probiotics requires...

It is known that paralleling the growth of fowls antibody-like factors against many bacteria and foreign cells appear regularly in their blood.' 5, 6 Cancer-inducing viruses are also affected by similar factors.7 The viruses of the Rous and Fuginami sarcoma and of the Mill Hill 2 endothelioma are strongly neutralized by the serum of adult fowls, but the Rous virus, the only one studied in this ...

Epidemiological studies suggest that retroviruses, including human immunodeficiency virus type 1, are associated with cardiomyopathy and myocarditis, but a causal relationship remains to be established. We encountered unusual cardiomyocyte hypertrophy and mitosis in Japanese native fowls infected with subgroup A of the avian leukosis viruses (ALVs-A), which belong to the genus Alpharetrovirus o...

Data are presented showing that the course of decline of egg production with age in the domestic fowl from the time laying begins up to and including 8 years follows an exponential law, that is, each year's egg production is a constant percentage of the preceding year's production (88 per cent in the group of fowl studied). Since the exponential law is the same as the law of monomolecular chang...