Mohammad Hasanzadeh
Department of Avian Diseases, Faculty of Veterinary Medicine, University of Tehran, Tehran, Iran
[ 1 ] - Efficacy of Echinacea purpurea and Protexin on systemic and mucosal immune response to Newcastle Diseases Virus vaccination (VG/GA strain) in commercial turkey poults
BACKGROUND: It is important to understand the efficacy of immunoregulatory materials, herbal remedies or probiotics, in different parts of immune system following vaccination with different tropism. OBJECTIVES: Aim of this study was to evaluate the effect of Echinacea purpurea and a probiotic (protexin) on systemic and mucosal immune response in turkey. METHODS: A total of 288 1-day-old male tu...
[ 2 ] - A study of the employment of melatonin supplementation and darkness regime on reducing the negative effects of acute heat stress and mortality in broiler chickens
Background: Heat stress is one of the most important environmental stressors challenging poultry production worldwide. Understanding and controlling environmental stressors is crucial for successful poultry production. OBJECTIVES: The aim of the present study was to investigate the effects of melatonin supplementation and darkness regime on reducing the negative effects of heat stress in broile...
[ 3 ] - Detection of cytolethal distending toxin (cdt) Genes in Campylobacter jejuni and Campylobacter coli isolated from the intestinal of commercial broiler chickens, turkey and quail of Iran
Background: Campylobacter jejuni and Campylobacter coli are zoonotic bacteria which are frequently associated with human diarrhea. Sharing of the cytolethal distending toxin (cdt) genes in Campylobacter is common and is considered species specific. OBJECTIVES: In this study we focused on detecting the presence of cdt gene in C. jejuni and C. coli isolated from broilers, turkeys and quails of Ir...
[ 4 ] - Detection of cytolethal distending toxin (cdt) genes of Campylobacter Jejuni and Coli in fecal samples of pet birds in Iran
BACKGROUND: Campylobacteriosis is one of the most commonbacterial intestinal disorders of humans in many countries.A wide range of domestic and wild bird species have been identifiedas natural reservoirs. OBJECTIVES: The aim of this studywas to determine the Campylobacter spp from pet birds andscreen the determined Campylobacters for presence of virulencecytolethal distending toxin (cdt) genes....
[ 5 ] - A comparative study on the colonization of Salmonella enteritidis hilA mutant and its parent strains in laying hens
BACKGROUND: Several regulatory proteins are involved in Salmonella invasion. The key regulator of SPI-1 (Salmonella pathogenicity island 1 ) is hilA, a transcriptional activator encoded on SPI-1 that regulates the expression of the SPI-1 secretion system. OBJECTIVES: Importance of hilA mutation on S. enteritidis colonization and shedding in layer hens was evaluated in a long-term experiment. ME...
[ 6 ] - Comparative study on the beneficial effects of different dark-length schedules on the incidence of ascites and metabolic parameters in fast growing broiler chickens
BACKGROUND: Increasing of oxygen consumption in fast-growing broiler chickens is associated with the more pronounced occurrence of right ventricular hypertrophy and ascites. While, rearing of susceptible chickens in dark condition could reduce the metabolic rate of birds and hence the incidence of ascites. OBJECTIVES: The present study was designed to investigate a comparative study on the inf...
[ 7 ] - Endogenous and environmental factors interactions that contribute to the development of ascites in broiler chickens: a review
The increasing susceptibility of broiler chickens to ascites syndrome has coincided with a continuing genetic and nutritional improvement in their feed efficiency and growth rate. Ascites is multifactorial and interactions between environmental and endogenous factors play a particularly important role. The selection of fast growing broilers for high feed efficiency, which is characterized by hy...
[ 8 ] - Effect of early cold exposure on the endocrine responses of broiler chickens and the incidence of ascites syndrome.
Two hundred and fifty day-old broiler chickens were housed in a high altitude farm and divided in two experimental groups (cold-exposed and control). At the age of 3 and 4 d, the cold-exposed chickens were exposed to 15?C for 3 h, while the control birds were reared under normal condition. During the period between 14 and 28 days, both groups of chickens were exposed to a low environmental temp...
[ 9 ] - Anatomical parameters of cardiopulmonary system, venous blood pCO2and pO2tensions and the development of ascites syndrome in two genetic line chickens that are differing in their growth rate
The present study was designed to examine the anatomical parameters of the cardiopulmonary system, the function of venous blood gas parameters and the development of ascites incidence in two genetic line chickens. Three hundred forty day-old chickens from two pure broiler breeder lines, which were different in their growth rate and susceptibility to ascites syndrome were obtained. The relative ...
[ 10 ] - Effect of chronic hypoxia during the early stage of incubation on prenatal and postnatal parameters related to ascites syndrome in broiler chickens
To investigate the influence of hypoxia during the early stage of incubation on embryonic developmentand hatching events, and consequently on incidence of ascites in broiler chickens, one thousand fertile eggswere incubated in two commercial incubators. Half the eggs were incubated in a low altitude incubator untilhatched. The second half were incubated in a high altitude incubator until day 10...
[ 11 ] - MHC IIB Genetic Diversity and its Association With Humoral Immune Responses in Commercial Turkey
Background: Major histocompatibility complex (MHC) is one of the best characterized genetic regions controlling immune responses against vaccines. Identifying the association between MHC haplotypes and improved immune responses would be useful in genetic breeding strategies in animals. OBJECTIVES: MHC class II B genetic diversity and its association with humoral immune responses against Newcast...
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