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Structural genes, not the LTRs, are the primary determinants of reticuloendotheliosis virus A-induced runting and bursal atrophy.

Reticuloendotheliosis virus strain A (REV-A) and chicken syncytial virus (CSV), two replication competent avian retroviruses, differ in the extent to which they induce a runting syndrome that includes anemia, lymphoid organ atrophy, and reduced body size. We have isolated an infectious clone of CSV, the less pathogenic of the two viruses, and compared it to REV-A. Partial DNA sequence analysis suggests that it differs from REV-A by no more than 1 to 2% at the nucleotide level. Analysis of viral interference indicates that these two viruses use the same cell receptor for infection of both fibro

Preliminary study on the effects of dry powder and water extract of Neolamarckia cadamba on growth performance, immunity, and intestinal health of yellow-feathered broilers.

BACKGROUND: In recent years, the livestock industry has shown increasing concern regarding the need to find effective alternatives to antibiotic products while also striving to produce high-quality livestock and poultry products. Woody feed sources exhibit wide distribution and variety, containing a variety of bioactive substances such as flavonoids and alkaloids. Among these woody plants, Neolamarckia cadamba (Nc) has the characteristics of high leaf yield, fast growth rate, and rich nutritional value, which has great development potential. However, whether Nc supplementation can improve grow

Influence of Huangqin Decoction on the immune function and fecal microbiome of chicks after experimental infection with Escherichia coli O78.

Huangqin Decoction (HQD), a traditional Chinese medicine formula from the Shang Han Lun written by Zhang Zhongjing, has been used in China f … reased ADG and reduced the mortality rates caused by E. coli challenge, decreased the heart, liver, bursa of Fabricius (BF) and spleen index. HQD supplementation decreased the serum lysozyme (LZM), IL-1β, TNF-α, IL-10, IL-6 level, down-regulated the mRNA expression of TLR4, -5 and -15 in the spleen by E. coli challenged chicks, and up-regulated the mRNA expression o …

Effect of feeding chitosan and blend of essential organic acids on growth performance, haematological parameters and innate immunity in early aged male layer chicks.

The use of antibiotics as conventional feed additives in poultry operations have proven useful, however resulted serious health concerns to … nd 21st dpf. No significant difference was observed in relative organ weights of thymus, spleen and Bursa of Fabricius in treatment groups as compared to control birds; however a significant rise in splenic weight index in OE fed birds at 42nd dpf noted. Haematological changes were inconsequential in treatment groups with an exception to enhancement of heterophil to …

Bird immunobiological parameters in the dissemination of the biofilm-forming bacteria Escherichia coli.

BACKGROUND AND AIM: With the development of industrial maintenance technology, a group of pathogens called avian pathogenic Escherichia coli … sitivity reaction was established. Signs of accidental transformation of the thymus, atrophy of the bursa of Fabricius, disseminated thrombosis, and septic spleen developed. Moreover, toxic cardiomyocyte dystrophy, signs of congestive vascular hyperemia, massive disintegration of lymphocytes, macrophage reactions, perivascular edema resulting from the release of pla …

Harnessing natural feed additives for sustainable production and economics: the role of Thymus vulgaris L. oil as an antimicrobial agent and a growth promoter in improving production and health of broiler chickens.

INTRODUCTION: This study examined the effects of adding thyme oil (TO) to broiler diets on growth performance, intestinal health, immune org … gnificance (P<0.05) noted in birds receiving 150, 225, and 300 mg TO/kg for the spleen, thymus, and bursa of Fabricius indices, compared with the control group. Moreover, total protein, globulin, immunoglobulin (IgM and IgG), and complement component 3 were significantly (P<0.05) higher by TO at 150, 225, and 300 mg/kg than at 0 and 75 mg/kg. Blood Ca and Mg were si …

Dietary supplementation with free methionine or methionine dipeptide mitigates intestinal oxidative stress induced by Eimeria spp. challenge in broiler chickens.

BACKGROUND: This study evaluated the effects of Eimeria spp. challenge and dietary supplementation with free methionine or methionine dipept … r FCR (about 12% lower) than chickens fed the NS diet. EC chickens had lower relative weight of the bursa of Fabricius (51.8%) and higher relative weights of the spleen and whole intestine (53.6% and 26.3%, respectively) than UC chickens. Eimeria spp. challenge led to an increase in the levels of oxidative substances, such as nitrite and thiobarbituric acid reactive …

A blend of microencapsulated essential oils improves performance, economic index, meat fatty acid profile, carcass characteristics, and immune index of broilers.

This experiment investigated the impact of the blend of microencapsulated essential oils (BMEOs) on performance, economic index, meat fatty … he control and other treatments. The diet containing BMEOs-900 increased the relative weight of the bursa of Fabricius (57.3%), spleen (51.6%), and thymus (123.2%) as immune organs, proventriculus (34.2%), and pancreas (49%) (P < 0.05), as well as lowered the relative weight of the abdominal fat (75.1%, P = 0.001) compared with broilers in the control and other trea …

Inhibitory effects of p-coumaric acid against avian pathogenic Escherichia coli O2:K1 in vitro and in vivo.

Avian colibacillosis, caused by avian pathogenic Escherichia coli (APEC), is a severe bacterial disease in the poultry industry. With the in … group showed significantly reduced heart, liver, lung, and spleen indices, and recovered thymus and bursa of Fabricius indices. Bacterial loads in blood and liver were significantly decreased. Serum levels of pro-inflammatory cytokines (TNF-α, IL-1β, and IL-6), endotoxin LPS, and infection marker PCT were significantly reduced, while the anti-inflammatory cytokine I …

Efficacy of Various Feed Additives on Performance, Nutrient Digestibility, Bone Quality, Blood Constituents, and Phosphorus Absorption and Utilization of Broiler Chickens Fed Low Phosphorus Diet.

The present trial was designed to assess the effect of phytase, multi-strain probiotic, Saccharomyces cerevisiae, and fumaric acid on perfor … nd even better than PC. The PHY, PRO, SC, and FA broilers had higher relative weights of spleen and bursa of Fabricius (p < 0.01) than NC. In comparison to NC, the PHY, PRO, and SC groups improved (p < 0.05) CP, CF, Ca, and P digestibility. Greater tibia breaking strength of the low nPP-supplemented groups was shown to be associated with higher tibia ash, Ca, and P …

Phytogenic cocktails fed in different feeding regimes as alternatives to antibiotics for improving performance, intestinal microbial, and carcass characteristics of slow growth chickens.

BACKGROUND AND AIM: The phytogenic cocktail (PC) is a unique combination of natural plant extracts consisting of coconut shell smoke, clove … bserved in the proportionate weights of the crop, proventriculus, gizzard, pancreas, cecum, spleen, bursa of Fabricius, heart, and liver. The reduction in the intestinal microbe population due to AGPs or PC was not statistically significant (p > 0.05). About 100% viability was confirmed by the absence of mortality throughout the study. CONCLUSION: PC supplementatio …

A morphological and immunohistological study of the human and rabbit appendix for comparison with the avian bursa.

Diversification of the primary antibody repertoire occurs in young rabbit appendix. As a prelude to molecular investigation of whether human appendix has a similar role, we compared the lymphoid morphology and distribution of common B- and T-cell subsets in frozen and/or paraffin-embedded normal appendix specimens at various ages. IgA, IgM and IgG staining patterns were similar in frozen human and rabbit appendices. The elongated follicles of the young human and rabbit appendices regressed with age to resemble Peyer's patches. Although similar in morphology to the bursa, human and rabbit appen

The influence of Spirulina extract on pathogenicity, immune response, and vaccine efficacy against H9N2 avian influenza virus in specific pathogen free chickens.

Avian influenza (AI) viruses pose a risk to the worldwide poultry industry. Ultimately, improving the efficiency of the H9N2 vaccine is nece … , G4, and G6, with improved histopathological alterations in the trachea, lung, kidney, spleen, and bursa of Fabricius.  G6 supplied with 400 mg/kg Spirulina extract feed only without vaccination had a similar effect as vaccinated groups on innate immunity. However, it delayed the production of antibodies and did not prevent viral shedding as in vaccinated groups. I …

Comparison of four infectious bursal disease viruses isolated from different bird species.

Four isolates of infectious bursal disease virus (IBDV), isolated from chicken, duck, goose and sparrow in Jiangsu province of China in 2002, were compared. The viruses were stable to the treatments of 60 degrees C for 1 h, pH 2.0 and lipid solvents. Their antigenic relatedness values (R) were from 0.76 to 0.78. Chickens infected with the chicken isolate showed severe clinical symptoms of IBD and the mortality rate was 33.3% (2/6). Chickens infected with the other three viruses survived but their bursas were damaged and the bursa/body-weight ratios were lower than those of the uninfected contr

Современные методы диагностики медицинских паразитов и артроподов

Обычные методы, такие, как микроскопия, используются для диагностики паразитических заболеваний и медицинских заболеваний, связанных с артроподами, на протяжении многих лет. Некоторые методы считаются золотыми. Однако их ограниченная чувствительность, специфичность и точность, а также потребность в дорогостоящих реагентах и высококвалифицированных технических специалистах являются критическими проблемами. В этой связи постоянно разрабатываются новые инструменты для уменьшения числа проблем. Недавно three Возникли самые современные методы: штрих-кодирование ДНК, геометрические морфометры и иску

Severe acute respiratory syndrome vaccine development: experiences of vaccination against avian infectious bronchitis coronavirus.

Vaccines against infectious bronchitis of chickens (Gallus gallus domesticus) have arguably been the most successful, and certainly the most … duct, and in many parts of the alimentary tract--the oesophagus, proventriculus, duodenum, jejunum, bursa of Fabricius, caecal tonsils (near the distal end of the tract), rectum and cloaca (the common opening for release of eggs and faeces), usually without clinical effects. The virus can persist, being re-excreted at the onset of egg laying (4 to 5 months of age), …

Модулы воздействия на организм человека, связанные с болезнями, связанными с имммуном.

Бисфенол А (БПА), используемый в поликарбонатных пластмассах и эпоксидных смолах, имеет широкое воздействие на человека. ПБВ вызывает озабоченность в связи с воздействием на развитие, которое приводит к иммуномодуляции и развитию болезней в силу ее способности пересекать плацентальный барьер и присутствовать в материнском молоке. БПА может использовать различные механизмы для модуляции иммунной системы и воздействия на болезни, включая агонистическое и антагонистическое воздействие на многие рецепторы (например, эстрогенные рецепторы), эпигенетические модификации, действие на пути клеточного с

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… Chick embryos exposed to BPA exhibited altered structures of the thymus, where T cells develop, and bursa of Fabricius, where B cells develop in birds [ 63 ]. However, no studies yet have examined the effects of prenatal or perinatal BPA exposure on bone marrow, where B cells develop in mammals. …