Effect of infectious bronchitis on the structure and composition of egg albumen

Butler, E.J.; Curtis, M.J.; Pearson, A.W.; McDougall, J.S.

doi:10.1002/jsfa.2740230313

Cited by 15 publications

(6 citation statements)

References 27 publications

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“…The finding regarding low Haugh units is consistent with results from our study of ultrastructural changes in the magnum during T and N1/88 infection and thus indicates that both of these Australian strains of IBV have tropism for the upper reproductive tract . Our findings support previous suggestions that IBV is associated with the thinning of albumen (Sevoian and Levine 1957;Butler et al 1972). The reduction in albumen quality, which also occurred during the follow-up trial, suggests that this is a real and consistent effect of challenge with the T and N1/88 strains of IBV.…”

Section: Discussionsupporting

confidence: 91%

Effects of Australian strains of infectious bronchitis virus on internal and external quality of hen eggs

Chousalkar

Roberts

2009

Anim. Prod. Sci.

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Abstract. The effects of two Australian strains of infectious bronchitis virus (IBV-T and N1/88) on the internal and external quality of eggs were studied in unvaccinated Isa Brown hens in full lay. Overall, there was no decline in egg production in either of the infected groups. However, there were some long-lasting negative effects on the egg internal quality of T-infected hens. Negative effects on internal quality in the N1/88-infected group were relatively short term. Yolk colour score was lower only in T-infected hens. Egg shell quality was affected only in terms of loss of egg shell colour. IBV infection resulted in paler egg shells in both the infected groups. Paler egg shells may not be regarded well by consumers. The egg shape index was lower in both infected groups.Additional keyword: oviduct.

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Section: Discussionsupporting

confidence: 91%

Effects of Australian strains of infectious bronchitis virus on internal and external quality of hen eggs

Chousalkar

Roberts

2009

Anim. Prod. Sci.

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“…(Jones & Jordan, 1971). Areas of glandular hypoplasia caused by IBV leads to reduction in the synthesis of albumen proteins especially ovomucin, lysozyme and other major proteins which constitute the structural matrix of the thick albumen (Butler et al, 1972). Hence, there is a decrease in the proportion of both thick and inner thin albumen, and an increase in the amount of outer thin albumen causing 'watery-whites'.…”

Section: Laying Hensmentioning

confidence: 99%

Infectious bronchitis virus: Immunopathogenesis of infection in the chicken

1997

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SUMMARYThe immunopathogenesis of infectious bronchitis virus (IBV) infection in the chicken is reviewed. While infectious bronchitis (IB) is considered primarily a disease of the respiratory system, different IBV strains may show variable tissue tropisms and also affect the oviduct and the kidneys, with serious consequences. Some strains replicate in the intestine but apparently without pathological changes. Pectoral myopathy has been associated with an important recent variant. Several factors can influence the course of infection with IBV, including the age, breed and nutrition of the chicken, the environment and intercurrent infection with other infectious agents. Immunogenic components of the virus include the S (spike) proteins and the N nucleoprotein. The humoral, local and cellular responses of the chicken to IBV are reviewed, together with genetic resistance of the chicken. In long-term persistence of IBV, the caecal tonsil or kidney have been proposed as the sites of persistence. Antigenic variation among IBV strains is related to relatively small differences in amino acid sequences in the S1 spike protein. However, antigenic studies alone do not adequately define immunological relationships between strains and cross-immunisation studies have been used to classify IBV isolates into 'protectotypes'. It has been speculated that changes in the S1 protein may be related to differences in tissue tropisms shown by different strains. Perhaps in the future, new strains of IBV may arise which affect organs or systems not normally associated with IB.

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“…Cole (1938) found, using ocular micrometry, that after 1 yr of egg production Leghorn layers producing eggs with a thick albumen of good condition had consistently higher goblet surface epithelial cell height throughout the albumen secreting tissues than did layers producing a more watery albumen. Magnum epithelial lining integrity can be affected by infectious bronchitis virus disease as can the surface epithelium condition (Sevoian and Levine, 1957;Butler et al, 1972). A decreased surface epithelial height and reduced surface epithelium periodic acid-Schiff (PAS) staining were noted in response to infectious bronchitis in some layers, although these observations were not precisely quantified.…”

Section: Introductionmentioning

confidence: 96%

Morphologic Characteristics of Oviducts from Hens Producing Eggs of Different Haugh Units Caused by Genetics and by Feeding Vanadium as Determined with Computer Software-Integrated Digitizing Technology

1995

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Magnum and isthmus morphologic characteristics (surface epithelium height, fold height and diameter, and periodic acid-Schiff-positive area and surface epithelium cells) of stained 6-micron tissue sections were measured by light microscopy, with data acquisition using a digitizing tablet interfaced to a microscope and to a personal computer with morphometric-dimensional software. Tissues were obtained from Leghorn layers in two separate experiments in which production of eggs with low and high Haugh unit (HU) values was induced by either genetic selection or by feeding V. Eggs produced by these hens had HU differences between the high and low groups of 11 to 14 units (both experiments, P = .0001) and had a greater volume of thick albumen fraction in high-HU groups (both experiments, P = .0001). The computer software-integrated digitizing system enabled rapid measurements of multiple characteristics. In the genetic lines, higher magnum fold height and magnum and isthmus surface epithelium height were detected at moderate significance (all at P < .05) in the tissues of the layers producing high-HU eggs than in tissues from the low-HU line. Other morphologic variables were not different between genetic lines. In response to feeding V, none of the morphological characteristics were affected, although magnum fold height approached difference at P < .07. Based on the observations in these two experiments, magnum fold height may be a further important factor related to egg albumen condition, in addition to surface epithelium height. It appears, however, that layers producing eggs of considerably different HU values, due in these experiments to genetics or V feeding, can have magnum or isthmus morphological characteristics that are indistinguishable, or only moderately different, as detected by integrated digitizing technology.

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Effect of infectious bronchitis on the structure and composition of egg albumen

Cited by 15 publications

References 27 publications

Effects of Australian strains of infectious bronchitis virus on internal and external quality of hen eggs

Effects of Australian strains of infectious bronchitis virus on internal and external quality of hen eggs

Infectious bronchitis virus: Immunopathogenesis of infection in the chicken

Morphologic Characteristics of Oviducts from Hens Producing Eggs of Different Haugh Units Caused by Genetics and by Feeding Vanadium as Determined with Computer Software-Integrated Digitizing Technology

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