Genetic appraisal of serological response post vaccination against enterotoxaemia (ET) in Malpura and Avikalin sheep.
Enterotoxaemia (ET) is a fatal enteric disease of small ruminants attributable to a toxigenic type of Clostridium perfringens. The key strategy for prevention of ET is the management and vaccination. Present study aimed at identifying the sources of variation for ET vaccine response especially against epsilon toxin in 173 sheep that included 83 Avikalin and 90 Malpura lambs raised at the institute flock in the semi-arid region of India. The mean age at vaccination was 90 days. Sera were tested by blocking ELISA. Study showed significant variability for response to ET vaccine. 5.2% animals had + positivity, 20.8% animals had ++ positivity, 51.4% animals had +++ positivity and 22.5% animals had ++++ positivity. Amongst environmental determinants, breed, season, sex and age at vaccination proved to be non-significant sources of variation (P > 0.05). MHC genotypes with DRB1 gene and DQA2 genes also revealed non-significant association with ET vaccine response; however, a trend of decreasing PI values with increasing ranks was observed. Study revealed strong response of epsilon toxin along with complexity of the ET vaccine response as phenotype to be explained by genetic and non-genetic factors. The importance of better management practices and vaccination is suggested for preventive measures.
ICAR-Central Sheep & Wool Research Institute, Avikanagar via, Jaipur, Rajasthan, 304501, India. gopalgowane@gmail.com.
G R
GR
Gowane
ICAR-Central Sheep & Wool Research Institute, Avikanagar via, Jaipur, Rajasthan, 304501, India.
Najif
N
Akram
ICAR-Central Sheep & Wool Research Institute, Avikanagar via, Jaipur, Rajasthan, 304501, India.
L L L
LL
Prince
ICAR-Central Sheep & Wool Research Institute, Avikanagar via, Jaipur, Rajasthan, 304501, India.
Ved
V
Prakash
ICAR-Central Sheep & Wool Research Institute, Avikanagar via, Jaipur, Rajasthan, 304501, India.
Arun
A
Kumar
D000818:Animals; D001427:Bacterial Toxins; D003016:Clostridium perfringens; D004767:Enterotoxemia / Q000276:immunology*; D004797:Enzyme-Linked Immunosorbent Assay; D005260:Female; D006683:HLA-DQ Antigens / Q000235:genetics*; D059811:HLA-DRB1 Chains / Q000235:genetics*; D007194:India; D008297:Male; D012756:Sheep; D012757:Sheep Diseases / Q000276:immunology / Q000517:prevention & control*; D034561:Sheep, Domestic; D014611:Vaccination / Q000662:veterinary*
D001427:Bacterial Toxins; D006683:HLA-DQ Antigens; C103596:HLA-DQA2 antigen; D059811:HLA-DRB1 Chains
ET vaccine; Environment; MHC genotypes; Sheep