marek's disease (md) is a common lymphoproliferative disease of chickens, usually characterized by mononuclear cellular infiltration in different organs. the disease is caused by a herpes virus and is transmissible. md has been a common, important problem for poultry industry worldwide, as well as, in our country, iran. the aim of present study was to have an estimation of the incidence of...

The present paper explores amino acid composition of breast and thigh muscles of common pheasant and compares it with that in broiler chickens. The experimental feeding of both pheasant and broiler chickens proceeded for a period of 42 days at the identical conditions employing the same diet and rearing technology. Muscles were analysed for the content of following amino acids: Asp, Thr, Ser, G...

Metabolic diseases such as ascites in broiler chickens result in significant economic losses to the poultry industry. The syndrome is multifactorial and mainly caused by exogenous and/or endogenous factors. Occurrences among faster growing lines are even more pronounced under conditions that imposed an additional metabolic load on the birds such as low ambient temperature. So, particular intera...

In commercial poultry husbandry, alternatives for the use of antibiotics and vaccines are under investigation, which preferably have to be applicable for both layer- and broiler-type chickens. There are indications that the defense mechanisms vary between layer- and broiler-type chickens. Therefore, the difference in immune response between layer- and broiler-type chickens of the same age was i...

Photoperiod is an important factor in stimulating broiler performance in commercial poultry practice. However, the mechanism by which photoperiod affects the performance of broiler chickens has not been adequately explored. The current study evaluated the effects of three different photoperiod regimes (short day (LD) = 8 h light, control (CTR) = 12.5 h light, and long day (SD) = 16 h light) on ...

ornithobacterium rhinotracheale (ort) has been identified as one of the respiratory bacterial pathogens in turkey and chicken flocks. four live birds displaying severe torticollis were submitted from a 13-week-old commercial broiler breeder chicken flock located in mazandaran province. these birds were suspected to pasteurellosis by the farm veterinarian. no other marked gross lesion except em...

Myosin heavy chain (MyHC), one of the major components in the contractile machinery of skeletal muscle fibers, is found in several isoforms during myogenesis. During chicken development, embryonic, neonatal, and adult MyHC isoforms are expressed. Broiler chickens have been selected for fast and large muscle growth, whereas Single Comb White Leghorn (SCWL) chickens have been selected for egg lay...

The most prevalent diseases in country poultry industry that will infect broiler chickens epidemic; be disrupts the liver function. The liver is an important diagnostic organ in broilers is raised and on the other hand, Because of speed up the metabolism in broiler chickens in order to increase production and efficiency, The liver is an important center involved in the metabolism, and the impor...