Economic effects of subclinical infectious bursal disease on broiler production

McIlroy, S. G.; Goodall, E. A.; McCracken, R.M.

doi:10.1080/03079458908418619

Cited by 20 publications

(8 citation statements)

References 15 publications

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“…In addition, the plant condemnation rate due to septicaemia-toxaemia syndrome may be increased tenfold from 0.5% to over 5% in affected flocks. McIlroy et al (1989) documented 14% depression in financial return from broiler flocks with subclinical IBD compared with unaffected flocks surveyed in…”

Section: Economic Significance Of Ibdmentioning

confidence: 99%

Infectious bursal disease

Lasher¹,

Shane

1994

World's Poultry Science Journal

104

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Infectious bursal disease (IBD), caused by an avibirnavirus, has been an economically significant, widely distributed condition affecting immature chickens since 1960. The classical type 1 conventional strain is responsible for up to 5% mortality in susceptible flocks. As a result of immunosuppression, growth rate, liveability, and productivity may be adversely affected by subsequent exposure to a wide range of viral, bacterial, and protozoal agents. The emergence of highly pathogenic strains of IBD virus in 1988 caused heavy losses in broiler and replacement breeder and commercial egg pullets in Europe, and subsequently in Africa and Asia. The causal virus is extremely lymphocidal with an affinity for immature B cells resulting in bursal atrophy approximately four days after infection. IBD virus is resistant to environmental exposure and is transmitted laterally by direct and indirect contact between infected and susceptible flocks. Conventional IBD is controlled by immunization of parent stock followed by vaccination of progeny after maternal antibody levels have waned. Parent level stock is immunized by one or two successive doses of live, mild or intermediate strain, attenuated vaccine to prime the immune system, followed by inactivated oil emulsion vaccines at maturity and at the mid-point of the laying cycle to boost immunity and ensure transfer of protective maternal antibody to progeny. Highly pathogenic IBD is controlled by a number of alternative strategies, including administration of live vaccines of low attenuation or simultaneous doses of live intermediate strain attenuated vaccine with inactivated oil emulsion during the first week. All successful programmes require diligent care regarding handling and administration of vaccine. Serological monitoring using automated ELISA technology is an accepted method of confirming that flocks are adequately protected. In the future recombinant and subunit vaccines will be developed to control existing strains and the variants which will emerge in areas with a high density of poultry production. . (1988) Comparative studies on structural and antigenic properties of two serotypes of infectious bursal disease virus. Journal of General Virology 69: BENTON, W. J., COVER, M. S. and ROSENBERGER, J. K. (1967a) Studies on the transmission of the infectious bursal agent (IBA) of chickens. Avian Diseases 11: 430-438 BENTON, W. J., COVER, M. S., ROSENBERGER, J. K. and LAKE, R. S. (1967b) Physico-chemical properties of the infectious bursal agent (IBA) Avian Diseases 11: 438-445 BENGELSDORFF, H-J. and BERNHARDT, D. (1971) Serological examinations after vaccination of chicks with mouse-adapted infectious bursitis virus. Proceedings of the 19th World Veterinary Congress, Mexico City, Mexico 2: 786-787 BOX, P. (1988) Antibody profile of broiler breeders hens and their progeny immunized with bursalderived or embryo-origin killed infectious bursal disease vaccine.

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Section: Economic Significance Of Ibdmentioning

confidence: 99%

Infectious bursal disease

Lasher¹,

Shane

1994

World's Poultry Science Journal

104

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“…The virus replicates in the bursa of Fabricius and other lymphoid tissues resulting in immunosuppression, which leads to an increased susceptibility to other infectious agents and a lack of humoral response to vaccinations (Allan, Faragher, & Cullen, ; Faragher, Allan, & Wyeth, ; Rosenberger & Gelb, ). IBDV infections are widespread and have a severe economic impact on the commercial poultry production (McIlroy, Goodall, & McCracken, ; Zachar et al, ).…”

Section: Introductionmentioning

confidence: 99%

“…. IBDV infections are widespread and have a severe economic impact on the commercial poultry production (McIlroy, Goodall, & McCracken, 1989;Zachar et al, 2016).…”

mentioning

confidence: 99%

Origin and global spreading of an ancestral lineage of the infectious bursal disease virus

Tomás

Marandino

Techera

et al. 2019

Transbound Emerg Dis

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Infectious bursal disease virus (IBDV) is an economically relevant and widespreadpathogen that produces immunosuppression in young chickens. IBDV is genetically classified into seven genogroups (G1-G7), where the traditional classic, variant and very virulent strains correspond to G1, G2 and G3, respectively. The G4 strains, also known as 'distinct' (dIBDV), have recently acquired increased relevance because of their prevalence and notorious impair to the poultry industry in South America. Here, worldwide dIBDV strains were studied using phylogenetic and phylodynamic approaches. The phylogenetic analyses performed using partial and complete sequences of both viral segments (A and B) consistently clustered the dIBDV strains in a monophyletic group. The analyses of the VP5, polyprotein and VP1 coding regions identified amino acid residues that act as markers for the identification of the entire dIBDV group or different sub-populations. The phylodynamic analyses performed using the hypervariable region of VP2 indicated that the dIBDV strains emerged in the early 1930s in Eastern Europe, shortly after the emergence of classic strains (1927) and before variant (1949) and very virulent strains (1967). The analysis of the migration routes indicated that after its emergence, the dIBDV strains spread to Eastern Asia around 1959, to Brazil around 1963, and to Argentina around 1990. These inter-continental migrations resulted in three sub-populations that are currently represented by strains from (a) Brazil, (b) Eastern Asia and Canada, and (c) Eastern Europe, Argentina and Uruguay. Taken together, our results highlight the complex evolutionary history of IBDV and the importance of new phylodynamic data to unravel and nearly follow the different evolutionary pathways taken by this important poultry pathogen.

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“…• McIlroy et al (1993) found that there was a positive impact of increasing vitamin E in the diets of birds with subclinical IBD. Their analysis showed that the performance of flocks with subclinical IBD was consistently worse in terms of net income, feed conversion ratio and average weight per bird than flocks without subclinical disease (McIlroy et al, 1989). In their trial the average net income of flocks with subclinical IBD and fed a high vitamin E-containing diet was 10% better than that from flocks with subclinical IBD and fed a normal vitamin E-containing diet.…”

Section: Infectious Bursal Diseasementioning

confidence: 97%

The economics of animal health and production

Rushton¹

2008

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Economic effects of subclinical infectious bursal disease on broiler production

Cited by 20 publications

References 15 publications

Infectious bursal disease

Infectious bursal disease

Origin and global spreading of an ancestral lineage of the infectious bursal disease virus

The economics of animal health and production

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