1 Retrospective investigation of poultry mortality in Tsirang- a report Dr. Rinzin Pem Sr. VO, RLDC Wangdue I. Background Given the large number of mortality in eight poultry farms in Gosaling geog and two farms in Tsholingkhar geog over a period of one week and with all the affected farmers seeking for free replacement stock from Dzongkhag, RLDC Wangdue was intimated and hence the need to carry out retrospective disease outbreak investigation in the affected geogs was felt. DVH Tsirang investigated and closely monitored the outbreak since day one of its occurrence. Although various samples and relevant data were collected during the outbreak period, no definite diagnosis has been made. Owing to this, the retrospective investigation was mainly aimed to validate their findings and find out the cause and possible source of the outbreak. II. Retrospective investigation methodology 1. Review the report on disease outbreak investigation conducted by DVH Tsirang and information gathered from the DVH Tsirang investigation team. 2. Visit affected poultry farms and interview the farm owners on events related to disease occurrence. 3. Collect relevant samples for further laboratory analysis. III. History DVH Tsirang received reports of increased mortality in young poultry birds in a total of eight layer farms located at Pemathang and Zomlingzor village in Gosaling geog and Drupchugang and Lower Tsholingkhar villages of Tsholingkhar geog on 31 st May 2014. The incidences were reported by respective geog livestock in-charges. A team from DVH immediately visited the affected farms for detail investigation and to institute appropriate control measures.
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Retrospective investigation of poultry mortality in Tsirang- a report
Dr. Rinzin Pem
Sr. VO, RLDC Wangdue
I. Background
Given the large number of mortality in eight poultry farms in Gosaling geog and two
farms in Tsholingkhar geog over a period of one week and with all the affected farmers
seeking for free replacement stock from Dzongkhag, RLDC Wangdue was intimated and
hence the need to carry out retrospective disease outbreak investigation in the affected
geogs was felt.
DVH Tsirang investigated and closely monitored the outbreak since day one of its
occurrence. Although various samples and relevant data were collected during the
outbreak period, no definite diagnosis has been made. Owing to this, the retrospective
investigation was mainly aimed to validate their findings and find out the cause and
possible source of the outbreak.
II. Retrospective investigation methodology
1. Review the report on disease outbreak investigation conducted by DVH Tsirang and
information gathered from the DVH Tsirang investigation team.
2. Visit affected poultry farms and interview the farm owners on events related to disease
occurrence.
3. Collect relevant samples for further laboratory analysis.
III. History
DVH Tsirang received reports of increased mortality in young poultry birds in a total of
eight layer farms located at Pemathang and Zomlingzor village in Gosaling geog and
Drupchugang and Lower Tsholingkhar villages of Tsholingkhar geog on 31st May 2014.
The incidences were reported by respective geog livestock in-charges. A team from DVH
immediately visited the affected farms for detail investigation and to institute appropriate
control measures.
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During the investigation, it was found that on 30th
May 2014, the owners of most of the
affected farms reported increased mortality to the geog livestock office. Appropriate
prevention and control measures were taken by the geog officials in both the geogs and
the outbreak incidences was then reported to DVH for further timely intervention.
Control and prevention measures instituted by Geog extension centre and DVH
Tsirang
Isolation of sick and affected birds from apparently normal birds.
Affected and in-contact birds treated with Tetracycline Hydrochloride
powder, Diaveridine and sulfaquinoxaline/ other coccidiostats and also feed
supplements (minerals and vitamins).
Owners were advised to thoroughly clean and disinfect the feeders and
waterers in the affected shed.
The carcasses of dead birds were disposed off following strict zoo sanitary
measures.
Owners were advised to change the litter in the contaminated shed and to
leave it vacant for a minimum of 21 days during which thorough cleaning and
disinfection to be done.
Owners advised to heighten bio security measures in the farms and prevent
further spread.
Affected farms were timely monitoring by Geog extension centre and DVH
Tsirang to control the infection and prevent new cases.
IV. Findings
a. Source of the chicks
The layer day old chicks were sourced from Satara Hatchery, an NPDC
contracted hatchery at Juprey at the rate of Nu. 30 per chick. Most of the farmers
lifted the chicks from the hatchery in hired vehicles.
b. Vaccination status
During the time of investigation, the vaccination status of the affected flock has
been recorded as vaccinated against Marek’s disease (done at the hatchery
immediately after hatching), ND (first dose on day 7) and IBD (new schedule
followed: first dose on day 10)
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c. Details of affected flocks
Sl.
No.
Name of the
poultry farmer
Village Geog Age
group
affected
(days)
Total
stock
Mortality
(number)
Mortality
(%)
1 Dewan Pradhan Pemathang Gosaling 23 1053 500 47.5