This special issue draws together a number of articles linked to the theme of the business history of new technologies. All of them were submitted to the Business History Review in the normal course of operations, but they are grouped together here because of their common concerns and interlinkages. The articles cover numerous wide-ranging issues, but it may be particularly worthwhile to point ...

Free-ranging local chicken flocks are important for the livelihood of resource-poor rural farmers in Tanzania, as they provide a critical source of animal protein and a ready source of income through the sale of chickens and eggs. An occurrence of highly pathogenic avian influenza (HPAI) in the village setting of Tanzania would result in a disastrous loss of livelihood. This paper attempts to o...

Several findings on the semen characteristics of domestic chickens have revealed that ecotype and age significantly affect quality. There is, however, lack data effects Tanzanian native roosters. This study evaluated effect ecotypes (Ching’wekwe, Morogoro-medium Kuchi) ages (11-15 24-28 months) A total 192 samples were collected from 12 roosters (four each ecotype) using abdominal massage techn...

Indigenous chickens (IC) are mainly raised by resource poor rural households in developing countries [1]. Although they are of low genetic potential compared to the commercial breeds, IC play a vital role in livelihoods of farmers and contribute significantly to food security and income [1]. IC dominates in most smallholder farms in Malawi and they are deemed less productive but appear to be ad...

A free range system of poultry production is an important economical investment to most the poor farmers as a source income and protein, however it faces several challenges including parasitic diseases such ectoparasite infestation. cross-sectional study was undertaken determine prevalence ectoparasites, well assess possible predisposing risk factors infesting free-ranging local chickens in urb...

The logistic, Gompertz, Richards and asymmetric logistic growth curve models were fitted to body weight data of local Ghanaian chickens and French SASSO T44 chickens. All four growth models provided good fit for each sex by genotype growth data with R2 values ranging from 86.7% to 96.7%. The rate constant parameter, k, ranged between 0.137 and 0.271 and were significantly different from zero fo...

chicken infectious anaemia is a viral disease in young chickens which characterized by aplastic anaemia and immunosuppression. between january 2004 and july 2005, an unusual hemorrhage in subcutaneous and intramuscular tissues of broiler chickens at slaughter houses of mashhad, isfahan and tehran provinces were occurred. postmortem examination revealed severe hemorrhages in the wings and muscle...

The objectives of this study were to analyze the genetic diversity and structure of South African conserved and field chicken populations and to investigate the maternal lineages of these chicken populations. Four South African conserved chicken populations (n = 89), namely, Venda (VD_C), Ovambo, Naked Neck, and Potchefstroom Koekoek from the Animal Production Institute of the Agricultural Rese...

The susceptibility of Aedes triseriatus (Say) (Diptera: Culicidae) to low levels of West Nile virus (family Flaviviridae, genus Flavivirus, WNV) was determined and compared with that of Culex pipiens L. to assess the likelihood of its participation in an enzootic cycle involving mammals. Ae. triseriatus and Cx. pipiens were exposed to WNV by feeding on baby chickens with WNV serum titers rangin...