The feather follicles appear on the fourth day and pin feathers emerge after a week.
2.
Between the 8th and 28th day the feather follicles on several remiges and rectrices become enlarged and blood filled.
3.
In modern birds, new vaned feathers emerge from the feather follicle enclosed in a " pin feather ", a solid tube covered in keratin.
4.
Emu leather has a distinctive patterned surface, due to a raised area around the feather follicles in the skin; the leather is used in such items as wallets, handbags, shoes and clothes,
5.
Characteristics of avian pox include the formation of intracytoplasmic inclusion bodies ('Bollinger bodies') which are composed of mononuclear inflammatory cells and have been detected in the thymus, spleen, bone marrow, middle ear and epidermis, feather follicles, sinuses and oral mucosa lining.
6.
Key clinical signs as well as gross and microscopic features that are most useful for differentiating Marek s disease from lymphoid leukosis and reticuloendotheliosis include ( 1 ) Age : MD can affect birds at any age, including 5 % in unvaccinated flocks; ( 4 ) Potential nerve enlargement; ( 5 ) Interfollicular tumors in the bursa of Fabricius; ( 6 ) CNS involvement; ( 7 ) Lymphoid proliferation in skin and feather follicles; ( 8 ) Pleomorphic lymphoid cells in nerves and tumors; and ( 9 ) T-cell lymphomas.
मोबाइल