{"id":5341,"date":"2026-01-22T16:16:39","date_gmt":"2026-01-22T09:16:39","guid":{"rendered":"https:\/\/www.greenfeed.com.vn\/staging\/thuc-an-chan-nuoi-gia-suc-gia-cam\/guide-to-effective-methods-of-prevention-and-treatment-of-crd-in-chickens\/"},"modified":"2026-01-22T22:27:52","modified_gmt":"2026-01-22T15:27:52","slug":"guide-to-effective-methods-of-prevention-and-treatment-of-crd-in-chickens","status":"publish","type":"post","link":"https:\/\/www.greenfeed.com.vn\/thuc-an-chan-nuoi-gia-suc-gia-cam\/en\/guide-to-effective-methods-of-prevention-and-treatment-of-crd-in-chickens\/","title":{"rendered":"GUIDE TO EFFECTIVE METHODS OF PREVENTION AND TREATMENT OF CRD IN CHICKENS"},"content":{"rendered":"

Chronic respiratory disease CRD, also known as “chicken asthma”, is a common infectious disease in poultry. The disease is mainly caused by the bacteria Mycoplasma gallisepticum (MG). In addition, the strain Mycoplasma Synoviae (MS) that causes infectious arthritis sometimes also causes respiratory tract inflammation in chickens. This article will discuss the signs of CRD and how to handle it when detecting chickens infected with CRD in time, to minimize economic losses for farm owners.<\/em><\/p>\n

1) What is CRD?<\/h2>\n

Chronic respiratory disease CRD, also known as “chicken asthma”, is a common infectious disease in poultry. The disease is mainly caused by the bacteria Mycoplasma gallisepticum (MG) in chickens of all ages.
\nCauses: The disease often occurs strongly when affected by the following factors:
\n\u2022 Sudden weather changes
\n\u2022 When transporting, moving flocks, combining flocks…
\n\u2022 Too high stocking density
\n\u2022 Wet, dusty barn floor, too high concentration of NH3, H2S…
\n\u2022 Not ensuring ventilation of the barn, especially not ensuring wind speed
\nPath of disease transmission:
\n\u2022 The disease is often transmitted vertically from the mother flock to the offspring.<\/p>\n

The disease is also transmitted horizontally when there is direct contact between infected or recovered birds but carrying the pathogen to susceptible flocks.<\/p>\n

Economic losses for farm owners:
\n\u2022 For broilers: reduced growth ability, increased feed consumption, high mortality rate
\n\u2022 For breeding and commercial laying hens: reduced survival rate and reduced egg production, thin shells. When the pathogen is transmitted through eggs, it often reduces the number of breeding flocks.
\nThe severity of the disease depends on the following factors:
\n\u2022 Density of M.Galisepticum bacteria in the breeding environment
\n\u2022 Time of disease detection, correct diagnosis, early treatment
\n\u2022 Resistance of livestock
\n\u2022 Density of secondary bacteria in the breeding environment
\n\u2022 Environmental conditions, weather, humidity, breeding temperature
\nThe disease is often combined with other diseases called CCRD, often combined with E.Coli, Salmonella, …
\nIn case of CRD E. Coli
\n\u2022 Causes the phenomenon of grafted asthma with green and white stools, air sacs containing a lot of inflammatory fluid, with bean curd on the air sacs, Fibrin-covered inflammation on the heart and liver, white like longan pulp
\n\u2022 If the disease is caused by Mycoplasma Synoviae, there are symptoms of arthritis
\n\u2022 Grafted asthma is often long-lasting, difficult to treat, causing economic damage
\n\u2022 High mortality rate
\n\u2022 Chickens with CCRD often have high FCR
\nThis article will discuss the signs of CRD and how to treat it When detecting chickens infected with CRD in time, to minimize damage to the farm owner.<\/p>\n

2) Identifying CRD in chickens<\/h2>\n

Symptoms:<\/p>\n

1. Sick chickens have difficulty breathing, are lethargic, tired, eat poorly, have ruffled feathers, and grow slowly<\/p>\n

<\/p>\n

2. Sick chickens wheeze, have beak scabbing, runny eyes, runny nose, eye inflammation leading to blindness.<\/p>\n

<\/p>\n

3. The nose contains inflammatory fluid<\/p>\n

<\/p>\n

4. Arthritis, swollen joints, fluid, elbow sitting position<\/p>\n

<\/p>\n

Lesions:<\/p>\n

1. Trachea contains a lot of phlegm<\/p>\n

<\/p>\n

2. Air sac inflammation<\/p>\n

<\/p>\n

3. Fibrinous hepatitis<\/p>\n

<\/p>\n

4. Sinusitis with caseous discharge<\/p>\n

\u200b\u200b\u200b\u200b\u200b\u200b\u200b<\/p>\n

3) Effective methods for preventing and treating CRD?<\/h2>\n

– Control and prevention
\n\u2022 Ensure quality of breeding stock, import breeding stock from reputable facilities
\n\u2022 Appropriate rearing rate for each flock
\n\u2022 Ensure airy and dry barns
\n\u2022 Fully vaccinate parent chickens and chicks
\n\u2022 Prevent disease by management, disinfection
\n\u2022 Use preventive medicine when the weather changes<\/p>\n

– Disease treatment:
\n\u2022 Regularly clean and disinfect barns
\n\u2022 Use antibiotics for treatment (Tylosin + Doxycycline, Timicosin + Doxycycline)
\n\u2022 Use adjuvant drugs (phlegm remover, vitamins)
\n\u2022 Treatment time is usually 7-10 days
\n\u2022 Combine spraying disinfectants throughout the barn<\/p>\n

Specific treatment instructions when chickens get CRD are as follows:
\nFirst, it is necessary to clearly distinguish asthma symptoms caused by MG or other causes to have the most appropriate treatment method. After determining the exact cause of MG, check for signs of MG combined with other bacteria or viruses to have an effective treatment plan.<\/p>\n

Next, carry out the following specific treatment steps:
\nStep 1: Treat the urgent symptoms of asthma, cough, and phlegm for chickens, combined with measures to restore the health of the flock: vitamins to supplement immunity and resistance
\n\u2022 Phlegm: Bromhexin can be used.
\n\u2022 Vitamins: vitamin A, vitamin D, vitamin C
\nStep 2: Destroy and inhibit pathogens with antibiotics sensitive to CRD in chickens. Can be prevented with vaccines (in case of virus transplantation), or can be combined with antibiotics (in case of bacterial transplantation), paying attention to the health of the flock.
\n\u2022 Tylosin + Doxycycline
\n\u2022 Timicosin + Doxycycline<\/p>\n

Note: Treatment time is usually 7 – 10 days. In parallel with the treatment process, it is necessary to regularly clean the barn and then spray disinfectant inside and outside the barn.<\/p>\n

In short, when detecting signs of difficulty breathing, wheezing when stretching the neck to breathe, lethargy, fatigue, poor appetite, wheezing, beak flapping, watery eyes, runny nose, eye inflammation, autopsy shows nasal sinuses, trachea with a lot of mucus and phlegm, the possibility of chickens having CRD is very high. It is necessary to quickly carry out CRD treatment steps for the entire flock. GREENFEED Vietnam hopes that the above information can help customers in detecting, controlling and treating CRD effectively, minimizing economic losses to the lowest possible level.<\/p>\n","protected":false},"excerpt":{"rendered":"

Chronic respiratory disease CRD, also known as “chicken asthma”, is a common infectious disease in poultry. The disease is mainly caused by the bacteria Mycoplasma gallisepticum (MG). In addition, the strain Mycoplasma Synoviae (MS) that causes infectious arthritis sometimes also causes respiratory tract inflammation in chickens. This article will discuss the signs of CRD and […]<\/p>\n","protected":false},"author":1,"featured_media":5342,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[771,763],"tags":[],"type_breed":[853],"type_livestock":[849],"class_list":["post-5341","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-disease-prevention-and-treatment","category-livestock-consultant","type_breed-colored-chickens","type_livestock-poultry"],"lang":"en","translations":{"en":5341,"vi":5271},"pll_sync_post":[],"acf":[],"_links":{"self":[{"href":"https:\/\/www.greenfeed.com.vn\/thuc-an-chan-nuoi-gia-suc-gia-cam\/wp-json\/wp\/v2\/posts\/5341","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.greenfeed.com.vn\/thuc-an-chan-nuoi-gia-suc-gia-cam\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.greenfeed.com.vn\/thuc-an-chan-nuoi-gia-suc-gia-cam\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.greenfeed.com.vn\/thuc-an-chan-nuoi-gia-suc-gia-cam\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.greenfeed.com.vn\/thuc-an-chan-nuoi-gia-suc-gia-cam\/wp-json\/wp\/v2\/comments?post=5341"}],"version-history":[{"count":1,"href":"https:\/\/www.greenfeed.com.vn\/thuc-an-chan-nuoi-gia-suc-gia-cam\/wp-json\/wp\/v2\/posts\/5341\/revisions"}],"predecessor-version":[{"id":5484,"href":"https:\/\/www.greenfeed.com.vn\/thuc-an-chan-nuoi-gia-suc-gia-cam\/wp-json\/wp\/v2\/posts\/5341\/revisions\/5484"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.greenfeed.com.vn\/thuc-an-chan-nuoi-gia-suc-gia-cam\/wp-json\/wp\/v2\/media\/5342"}],"wp:attachment":[{"href":"https:\/\/www.greenfeed.com.vn\/thuc-an-chan-nuoi-gia-suc-gia-cam\/wp-json\/wp\/v2\/media?parent=5341"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.greenfeed.com.vn\/thuc-an-chan-nuoi-gia-suc-gia-cam\/wp-json\/wp\/v2\/categories?post=5341"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.greenfeed.com.vn\/thuc-an-chan-nuoi-gia-suc-gia-cam\/wp-json\/wp\/v2\/tags?post=5341"},{"taxonomy":"type_breed","embeddable":true,"href":"https:\/\/www.greenfeed.com.vn\/thuc-an-chan-nuoi-gia-suc-gia-cam\/wp-json\/wp\/v2\/type_breed?post=5341"},{"taxonomy":"type_livestock","embeddable":true,"href":"https:\/\/www.greenfeed.com.vn\/thuc-an-chan-nuoi-gia-suc-gia-cam\/wp-json\/wp\/v2\/type_livestock?post=5341"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}