Descriptive Study of an Outbreak of Avian Urolithiasis in a Large Commercial Egg Complex in Algeria

Sid, Hicham; Fettah, Amine; Lounas, Abdelaziz

doi:10.15835/nsb315631

Cited by 4 publications

(9 citation statements)

References 13 publications

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“…Laying hens affected by urolithiasis show a decrease in moderate egg production (5,22). In the present report, the decrease in egg production was associated with atrophy of ovarian follicles.…”

Section: Discussionsupporting

confidence: 53%

“…Flock health directly impacts productivity. Urolithiasis is a potentially significant disease of layers due to its propensity to reduce egg production and increase mortality (2,5,7,16,22,24).…”

Section: Introductionmentioning

confidence: 99%

“…Chickens with urolithiasis often show a drop in egg production (5), which may be accompanied by depression, dehydration (7), weight loss, and enlargement of the toes (22). Macroscopically, the ureters are distended by uroliths, with consequent renal atrophy, in addition to varying degrees of visceral urate deposition.…”

Section: Introductionmentioning

confidence: 99%

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Pathology of severe urolithiasis in a flock of egg-laying hens

Ecco¹,

Lopes²,

Fonseca³

et al. 2021

BJVP

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Fourteen, 31-week-old Lohmann white layers from a flock of 30,000 chickens had a history of apathy, and a drop in egg production. Clinical signs were observed in approximately 40% of the flock, and lasted for three months. Fourteen hens were euthanized for post-mortem examinations. Macroscopic findings included marked atrophy and loss of renal lobes along with compensatory renal hypertrophy of the contralateral lobe. Ureters were markedly dilated and filled with mucus and/or with molded white to yellow-grey uroliths that obliterated the lumen. At histopathology, the uroliths inside ureters and tubules were composed of concentrically arranged mineralized concretions, as well as urates associated with heterophilic infiltrations and epithelial hyperplasia. Renal parenchyma adjacent to obstructed ureters was compressed with tubules replaced by fibrous tissue. Multifocal interstitial lymphocytic nephritis, proteinuria and membranoproliferative glomerulonephritis were also found. Heterophilic and caseous ureteritis associated with numerous Gram-positive coccoid bacteria occurred in three chickens. Immunohistochemistry for avian coronavirus was negative. This negative result along with the case history indicated that water restriction was the most likely cause of mortality. This condition resulted in significant economic loss for this farmer.

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Section: Discussionsupporting

confidence: 53%

Section: Introductionmentioning

confidence: 99%

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Pathology of severe urolithiasis in a flock of egg-laying hens

Ecco¹,

Lopes²,

Fonseca³

et al. 2021

BJVP

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“…More recently, IBV has been associated with nephritis which is now a major problem in broiler flocks worldwide [19-21]. Similar concerns have been reported in Algeria, but no study has been performed so far on IB-associated nephritis [22].…”

Section: Discussionmentioning

confidence: 81%

The first evidence of a new genotype of nephropathogenic infectious bronchitis virus circulating in vaccinated and unvaccinated broiler flocks in Algeria

et al. 2018

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Background and Aim:Avian infectious bronchitis virus (IBV) frequently infects broilers and is responsible for severe economic losses to the poultry industry worldwide. It has also been associated with kidney damage in the broiler flocks. The aim of the present study is to determine the presence of IBV and its possible involvement in kidney damage of broiler chicks.Materials and Methods:14 clinically diseased broiler flocks from Western and Central Algeria were sampled and analyzed by hemagglutination inhibition (HI) test and reverse transcriptase-polymerase chain reaction (RT-PCR) followed by phylogenic analysis.Results:The QX (100%) and 4/91 (60%) IBV serotypes were the most prevalent in the kidney damaged broilers regardless of vaccination status. The molecular detection of avian IBV by RT-PCR identified six samples as positive, of which only two isolates were typable by sequencing. We identified a novel IBDZ13a genotype which showed 93% sequence homology to the partial-S1 gene sequence of the IB 4/91 commercial vaccine strain. Sequencing analysis characterized this virus as a novel and divergent IB 4/91 field virus with eight amino acid substitutions that might have resulted in altered immunogenicity.Conclusion:The isolation of a new IBV strain (IBDZ13a) from vaccinated broiler flocks may explain the failure of the vaccination programs against IBV field strains. Combination of the HI test and RT-PCR indicated that the nephropathogenic IB outbreaks in broilers are related to this novel strain.

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“…Avian urolithiasis is a metabolic condition related to kidney dysfunction or failure and may cause mortality and reduced productivity in poultry (El Sebaei et al, 2021, Hicham et al, 2011. Ahmed et al (2003) described urolithiasis as a renal condition that causes kidney asymmetry or atrophy and urolith deposits in the ureter.…”

Section: Introductionmentioning

confidence: 99%

Bone quality and incidence of urolithiasis in male broiler breeders fed a male or female ration.

Dube

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Descriptive Study of an Outbreak of Avian Urolithiasis in a Large Commercial Egg Complex in Algeria

Cited by 4 publications

References 13 publications

Pathology of severe urolithiasis in a flock of egg-laying hens

Pathology of severe urolithiasis in a flock of egg-laying hens

The first evidence of a new genotype of nephropathogenic infectious bronchitis virus circulating in vaccinated and unvaccinated broiler flocks in Algeria

Bone quality and incidence of urolithiasis in male broiler breeders fed a male or female ration.

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