Lameness in poultry Flashcards
when investigating a lameness issue in chickens what is the first test you do
PM examination- gives you an idea of what you are looking for
when using PM in poultry to diagnose issue which birds should you use
fresh dead that had lameness are better
average batch size - 6 birds
Describe the procedure of necropsy for lameness exam
Weigh the submissions
Superficial examination
Systematic approach, don’t forget spinal pathology
which diseases can blood smapling boilers be useful for
Mycoplasmosis
ORT
Mareks disease
Gumboro disease
How many birds should we sample when we blood sample for lameness
60 samples per group to give 95% confidence that infection of 5% of birds would be detected
List 2 spinal problems that can cause lameness in poultyr
spondylolisthesis (kinky back)
osteomyelitis of the thoracic spine
Decsribe rickets
thickening of all long bone growth plates- long bones are soft and pliable
caused by a lack of vitamin D3 or a Ca/P imbalance resulting in a lack of mineralisation
Describe tibial dyschondroplasia
thickening of the growth plate of the tibiotarsal bone.
The zone of hypertrophied cartilage cells in the proximal end of the tibiotarsal bone fails to become calcified because its blood supply is absent
How do we confirm rickets in poultry
histopathology
List the clinical signs of femoral head necrosis
severely lame
hot swollen joints
difficulty in rising
wing used for support
lameness more prevalent in heavier birds
what causes femoral head necrosis in poultry
Generally staphylococcus aureus
reovirus
List the clinical signs of tendon rupture
hopping lameness
palpabe thickening of gastrocenemius
what vein do we use to tak chicken blood samples
brachial vein
do normal birds sit on their hocks
no this indicates an issue int he legs or the spine
how do we confirm osteomyelitis of the thoracic spine
PME for bacteriology
