Infectious Bronchitis Pictures in Layer Hens.
Infectious bronchitis, IB is the highly contagious disease of major economic importance in commercial chicken flocks throughout the world. It is an acute disease in chicken. The disease commonly characterized by respiratory signs, although decreased egg production and poor egg quality are sometimes seen in breeders and layers. but, we often find symptoms of infectious bronchitis in laying hens with different symptoms. Such as water belly, chicken stomach looks bloated and many chickens do not produce eggs. This is a big economic loss because laying hens consume feed every day, but they do not produce eggs at all. So the performance of egg production from the flock that there are chickens with such symptoms is not good. Supposedly at 24 weeks of age, 90% of the chicken population of a flock should have produced eggs daily. But in this case generally, the flock does not reach the top of production. Usually, until the age of 30 weeks, maximum egg production is only 60-85%.
infectious bronchitis, water belly, cystic oviductChickens that show symptoms of a bulging belly, will appear visible only when the chicken has been aged over 25 weeks. In general, we will start finding lots of chickens with such symptoms at week 30. Laying chickens will look fat at first, but eventually, his belly grows, standing like a penguin.
In a chicken flock, consisting of thousands of laying hens, these symptoms can be found 0.5-10%, generally below 1%. However, in severe cases of IB, it can be found above 5%. Chickens with symptoms like this can not be cured. If all of these chickens are removed from the flock by doing selection until the age of 40 weeks, then usually we will not find another new chicken with the same symptoms. Usually, after the chickens are removed from the flock, the performance of egg production from the flock will be better. But sometimes, production is still not as good as expected. Though chickens that show symptoms of belly abdomen has been selected. Why did this happen? This question will be answered in another article.
This is one symptom of the many clinical symptoms of infectious bronchitis caused by the IB variant virus, the QX virus. This is a cystic oviduct. Oviduct laying hens contain lots of water. Looks like a balloon filled with water. So that the abdomen looks bulging. (Then, if doing a necropsy, it should be done cautiously. The tip of the scissors will be able to tear out a thin oviduct. It’s very fragile). Oviduct becomes deformed, unable to accept mature egg follicles. Cystic size is very diverse, from small to large size. In this picture, is a large cystic. Large cystic can produce water more than 1 liter. It takes the time to produce this much water.
This is a permanent destruction of the oviduct infected by the infectious bronchitis virus when the chick is still very young. Around chicks under 3 weeks old. IB QX virus only causes respiratory clinical symptoms at the time. But a few percent of chicks with very low immunity, viruses can damage the development of oviduct. After the chickens recover from respiratory symptoms, the chickens still grow well, but unknowingly, there has been a development of cystic oviduct in the chick, until the pullet, from the small oviduct until gradually enlarges, and looks bulging after the age of 25 weeks. Poultry farmers realized only after the chicken stomach looks bigger. In fact, the development of fibrosis has been going on for a long time.
There are some unique phenomena, usually a chicken with symptoms of a bulging belly or having a cystic oviduct does not produce eggs. But not all chickens like that. If you look closely, there are several chickens with the same symptoms but can produce eggs. Why is this happening, check out our other article.
In the case of the cystic oviduct, the follicles remain well developed. However, a mature follicle can not enter the oviduct. So many follicles fall into the abdominal cavity. How to prevent this disease? early IB vaccination in chicks.