نشریه هیستوبیولوژی دامپزشکی
سال پنجم شماره 1 (پیاپی 8، بهار و تابستان 1396)

Effect of density on performance of two broiler strains  This study was carried out to evaluate performance of two strains of broilers under heat stress condition and experienced different number of density per m2. Duration of experiment was 8 weeks and trial was performed using 1632 chicks in a completed randomized design (CRD), with 2×2 factorial arrangements. This design included 2 strains (Arian and Ross), 2 levels of densities (10 and 14 chicks per m2). Measured traits included weight gain (WG), feed intake (FI), feed conversion ratio (FCR), final body weight (FBW). According to the results, effects of strains of FI, WG and TMP were significant (p<0.01). This means Arian strain had higher FI and WG.

One of the major problems in native poultry breeding, which also causes damage, is the issue of contamination with ectoparasites, due to the low level of health in the method of maintenance, the high population of villagers in Iran and the traditional practice of keeping and breeding poultry The identification of pathogens in this category of poultry is important and contributes to the fight against and the prevention of their diseases. The aim of this study was to investigate the contamination of ectoparasites in native poultry in the city of Roudsar. For this purpose, the body of 90 birds was carefully examined. In total, 60 (66%) of the samples showed foreign parasites. The isolates included: Menopon Gallinae (38%), Menacanthus stramineus (22%), Goniodes disimilis (31%), and Argas persicus (8%). Finally, the study found that the contamination of foreign parasites is relatively common among native poultry in the city of Roudsar. It is suggested that educational programs about periodical anti-parasitic treatments are necessary for veterinarians and rural people.

In the past five years, The disease that suspected streptococosis was epidemic in rainbow trout farms in Ilam, In this study, 60 rainbow trout with Clinical signs such as lethargie, erratic swimming, skin darkness and exophthalmia, were collected from rainbow trout farms in Ilam in southwest of Iran in January 2010, for detection agent of disease samples were collected from spleen, kidney and liver of fish then cultured on blood agar and incubated at 22 ºC for 24 h. Based on biochemical tests, Lactococcus garvieae was detected and isolates were confirmed as L. garvieae by using a m-PCR targeting lctO-gene, 16S rRNA and 16S- 23S rRNA Internal Transcribed Spacer region(ITS) sequencing that detect L .garvieae, Streptococcus iniae and S. dysgalactiae,. In the present study we observed a single band of 1100 bp for L. garvieae for most of isolates and concluded that the main agent of septicemia was L. garvieae. In conclusion, Multiplex PCR was definite method for rapid detection of L. garvieae in mixed infection in rainbow trout.

usually Bone defect occurs because of cysts, tumors, osteotomies, etc... During the past 50 years, various materials have been used as bone substitutes and bone graft. There is no ideal bone substitute or bone graft for use in all conditions. Bone grafting include: autograft, allograft, xenograft , and santetic material. Synthetic DBM is commonly used as an allograft, characterized by osteoinduction and osteoconduction but without osteogenicity due to processing.DBM is achieved when the minerals of bone be removed by using acid ( usually HCL or nitric acid ) Using DBM is affordable and available in abundance. There are numerous DBM formulations based on their manufacturing techniques. They are used as frozen powders, granules, gels, cements or tapes. DBM is used for bone defects healing because of cysts, tumors, etc… and especially in long bones defects. In most studies, the use of DBM in bone defect repair has been effective and useful.

Crude oil is a naturally occurring complex mixture of hydrocarbon and non-hydrocarbon compounds. Oil-based products are the main source of energy for industry and daily life. However, today's environmental pollution by petroleum hydrocarbons and its adverse effects on the environment is significant among the many problems. The effect of oil on microbial populations depends upon the chemical composition of the oil and on the species of microorganisms present. Populations of some microbes increase; typically, Many of microorganisms are capable of utilizing petroleum hydrocarbons as nutrient. The process of bioremediation, defined as the use of microorganisms to detoxify or remove pollutants owing to their diverse metabolic capabilities is an evolving method for the removal and degradation of many environmental pollutants including the products of petroleum industry. Biodegradation by natural populations of microorganisms represents one of the primary mechanisms by which petroleum and other hydrocarbon pollutants can be removed from the environment and is cheaper than other remediation technologies. This paper presents an updated overview of petroleum hydrocarbon degradation by microorganisms.Keywords: Biodegradation, crude oil, microorganisms

Ichthyophthirius Multifiiliis caused "Ich" or "White spot disease" which is the most important parasitic protozoan disease in aquarists and commercial fish.The disease detected by presence of white spots on the skin, fin or gills. In this study five groups of fish aquarium included Oscar, flower, discus, gold fish and angel were used in Aleshtar city.All groups were contaminated by the parasite after seven days and then infection and mortalities rates of each groups were estimated in the fifth and tenth.The results showed discus and flower fish were most susceptible to the parasite.

One of the major problems in native poultry breeding, which also causes damage, is the issue of contamination with ectoparasites, due to the low level of health in the method of maintenance, the high population of villagers in Iran and the traditional practice of keeping and breeding poultry The identification of pathogens in this category of poultry is important and contributes to the fight against and the prevention of their diseases. The aim of this study was to investigate the contamination of ectoparasites in native poultry in the city of Langroud in 1395. For this purpose, the body of 180 birds was carefully examined. In total, 100 (55%) of the samples showed ectoparasites. The isolates included: Menopon Galline (22%), Goniodes disimilis (19%), Magnina cubitalis (8.3%) and Hyaloma (5.5%). Finally, the study found that the contamination of ectoparasites is relatively common among native poultry in the city of Langroud, which requires necessary strategies to control this infection.