in this experiment two pre-laying broiler breeder pullets from ross strain at 17 weeks of age were selected, weighed and allocated in layer cages. surgery was achieved to implant a jugular vein catheter. the birds were placed individually in metabolic chamber. each bird was fed, in random order, test diets containing one of nine levels of lysine (0.05, 0.1, 0.2, 0.3, 0.4, 0.5, 0.8, 1.0 and 1.5 ...

avian intestinal spirochetosis (ais) is a disease of birdscharacterized by a marked colonization of the cecum and/or rectumwith anaerobic intestinal bacteria of the genus brachyspira. thepurpose of the study was to determine the occurrence of brachyspiraspp from avian sources in iran and to characterize selected isolates bybiochemical and molecular methods. out of 165 fecal samples obtained fro...

egg drop syndrome (eds) is caused by a hemagglutinating adenovirus which has become a major cause of lost egg production and sever economic losses in breeder and layer chicken flocks throughout the world. a pcr assay was optimized for detection of eds virus in inoculated allantoic fluids (afs) of duck and chicken emberyonated eggs. two strains of eds viruses were propagated in allantoic cavity ...

To understand the hepatic metabolic changes during postnatal liver maturation process in breeder roosters, we investigated the hepatic metabolites composition of 1-day-old, 42-day-old, and 35-week-old breeder roosters using gas chromatography-mass spectrometer (GC-MS). Comprehensive multivariate data analyses were applied to identify the distinguishing metabolites of liver. 84 different kinds o...

An essential role of several specific intestinal bacteria in the intestinal IgA level is suggested. Fecal IgA concentration in mice from one breeder was significantly higher than that in mice from two other breeders. The level of segmented filamentous bacteria and four particular clostridia in mice from the former breeder are of particular importance in developing the IgA production and secreti...

avibacterium paragallinarum is gram-negative bacteria that cause infectious coryza (ic), an acute respiratory disease of chickens. despite vaccination of layer and breeder farms of iran against ic, they are still experiencing the disease clinically and there is no knowledge of serotypes prevalence of this bacterium in this country. this study designed to determine serovar identity by molecular ...

The aim of this study was to determine the presence of genes coding for alpha (cpalpha), beta (cpbeta), epsilon (epsilontx), iota (iotaA), enterotoxin (cpepsilon) and beta2 (cpbeta2) toxins in Clostridium perfringens isolates from broiler chickens and parent broiler breeder hens, using multiplex polymerase chain reaction (PCR) assay. The prevalence of C. perfringens in the intestinal segments a...

Avian intestinal spirochetosis (AIS) is a disease of birdscharacterized by a marked colonization of the cecum and/or rectumwith anaerobic intestinal bacteria of the genus Brachyspira. Thepurpose of the study was to determine the occurrence of Brachyspiraspp from avian sources in Iran and to characterize selected isolates bybiochemical and molecular methods. Out of 165 fecal samples obtained fro...

The importance of individuals to the dynamics of populations may depend on reproductive status, especially for species with complex social structure. Loss of reproductive individuals in socially complex species could disproportionately affect population dynamics by destabilizing social structure and reducing population growth. Alternatively, compensatory mechanisms such as rapid replacement of ...