What is the best treatment for CRD in poultry?

CRD is one of the most common causes of disease in backyard fowls. Chronic respiratory disease (CRD) occurs when chickens and turkeys that are infected with Mycoplasma gallisepticum are stressed. The bacteria then causes major damage to the bird's respiratory system.

一、What are the symptoms of CRD in poultry?

MG infection in chickens is also known as Chronic Respiratory Disease (CRD). MG usually causes only mild clinical signs and lesions in chickens. Symptoms of MG include coughing, sneezing, rales, difficulty breathing, nasal discharge and foamy eyes (figures 1 and 2). MG also can reduce growth rate and egg production.

二、CRD in Poultry- Chronic Respiratory Disease' Cause:

The underlying cause of CRD in Poultry is Mycoplasma gallisepticum (MG).The condition is frequently triggered by respiratory viruses such as ND and IB and subsequently complicated by bacterial invasion.The main agents involved in the infection are Mycoplasma gallisepticum and E. coli. Stress caused by moving the birds, by debeaking, other operations/handlings or other unfavourable conditions e.g. cold or bad ventilation, make the birds more susceptible. Avian mycoplasmosis can be caused by several species of Mycoplasma (class Mollicutes, order Mycoplasmatales, family Mycoplasmataceae) including Mycoplasma gallisepticum, M. synoviae, M. meleagridis and M. iowae. M. gallisepticum is the most important pathogen in poultry. It also causes disease in other avian species. M. gallisepticum infections are also known as chronic respiratory disease (CRD) of chickens, infectious sinusitis of turkeys and house finch conjunctivitis. Several strains of M. gallisepticum have been reported, including the R (poultry), P (psittacine) and house finch strains. Strains may vary greatly in their pathogenicity for different species of birds. In one study, budgerigars developed severe disease after experimental infection with the R strain of M. gallisepticum but not the house finch strain.

Etiology Mycoplasma gallisepticum + chronic stress factor + secondary coliform organisms cause respiratory disease Species susceptible Chickens, turkeys, pigeons, ducks,Peafowl and passerine birds. Incidence Very widespread and present in most, if not all commercial flocks. Each batch of new pullets will become infected.

三、What is the best treatment for CRD in poultry?

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