Distribution of Endogenous Viruses in Some Commercial Chicken Layer Populations

Extent and consistency across generations of linkage disequilibrium in commercial layer chicken breeding populations.

Recent studies report a surprisingly high degree of marker-to-marker linkage disequilibrium (LD) in ruminant livestock populations. This has important implications for QTL mapping and marker-assisted selection. This study evaluated LD between microsatellite markers in a number of breeding populations of layer chickens using the standardized chi-square (chi(2')) measure. The results show appreci...

Salmonella serovars and their distribution in Nigerian commercial chicken layer farms

Commercial poultry farms (n° 523), located in all the six regions of Nigeria were sampled with a view to generate baseline information about the distribution of Salmonella serovars in this country. Five different matrices (litter, dust, faeces, feed and water) were collected from each visited farm. Salmonella was isolated from at least one of the five matrices in 228 farms, with a farm prevalen...

Distribution of Fitness in Populations of Dengue Viruses

Genetically diverse RNA viruses like dengue viruses (DENVs) segregate into multiple, genetically distinct, lineages that temporally arise and disappear on a regular basis. Lineage turnover may occur through multiple processes such as, stochastic or due to variations in fitness. To determine the variation of fitness, we measured the distribution of fitness within DENV populations and correlated ...

Comparative Adaptation of some pox viruses in two cell systems

Endogenous origin of viruses.

Scientists have done extensive research on viruses in the past decades and formulated many theories about their source. One of the theories is that viruses may be derived from a component of host cells that became autonomous. They resemble genes that have acquired the capacity to exist independently of the cell. Some viral sequences are related to portions of cellular genes encoding functional ...