Morphological study of the testis of adult Sudanese Chicken : gallus domesticus

Morphological study of the testis of adult Sudanese Chicken : gallus domesticus The adult chicken testes were two bean - shaped , large and soft , the left testis is usually higher in position and larger in size than the right one . The testis is active during cold weather with the mean diameter of the seminiferous tubules being 126^m in the chicken . it is less active during the hot season with the mean diameter of the seminiferous tubules being 135^m in the chicken. The non - breeding season seemed to be characterized by a decline in the spermatogenic activity only and not by complete spermatogenesis

Direct allele introgression into pure chicken breeds using Sire Dam Surrogate (SDS) mating

Poultry is the most abundant livestock species with over 60 billion chickens raised globally per year. The majority of chicken are produced from commercial flocks, however many indigenous chicken breeds play an important role in rural economies as they are well adapted to local environmental and scavenging conditions. The ability to make precise genetic changes in chicken will permit the validation of genetic variants responsible for climate adaptation and disease resilience, and the transfer of beneficial alleles between breeds. Here, we generate a novel inducibly sterile surrogate host chicken. Introducing donor genome edited primordial germ cells into the sterile male and female host embryos produces adult chicken carrying only exogenous germ cells. Subsequent direct mating of the surrogate hosts, Sire Dam Surrogate (SDS) mating, recreates the donor chicken breed carrying the edited allele in a single generation. We demonstrate the introgression and validation of two feather trait alleles, Dominant white and Frizzle into two pure chicken breeds using the SDS surrogate hosts.

The Branching Pattern of the Aortic Arch in Gallus Domesticus

In birds, in contrast to mammals, two brachiocephalic trunks are the origin in the arch of aorta and give rise to the subclavian arteries and common carotid. The aim of this study was to investigate the vascular branching morphology of the aortic arch in Gallus Domesticus with the purpose of providing accurate data with regards to the arterial supply of these segments to researchers and clinicians. The biological material was represented by 10 adult chicken bodies with an average weight of 2 kg, females. After procurement of the biological material, the feathers, skin, muscles and sternum were removed for easy access to the heart. After left ventricular cannulation, epoxy resin mixed with red dye was injected. The body was immersed in 5% formaldehyde for 24 hours. Next, stratigraphic dissection was performed. Two brachiocephalic trunks branched continually from aortic arch caudoventral to the primary bronchi. The left subclavian artery gave rise to sternoclavicular, thoracic, axillary and intercostal and the same was observed to the right side. Due to this method we could observe the aortic arch of Gallus Domesticus being different from mammals in that the left and right brachiocephalic trunks are detached from it.

Study on the Prevalence of Ectoparasitic Arthropods on Free Range Gallus domesticus in Two Communities in Awka

A survey was carried out to determine the prevalence of ectoparasitic arthropods in free range domestic fowl (Gallus domesticus) in Amansea and Ifite communities, in Awka Capital Territory, Anambra state. A total of 112 G. domesticus comprising of 42 Adult males, 30 adult females and 40 juveniles were examined during a house to house survey for ectoparasitic arthropods. The study was carried out between June and September, 2014. The domestic fowl were caught in their roosting places at night and were examined for ectoparasitic arthropod infestation. 73.21% prevalence of ectoparasitic arthropods on the chicken was recorded. Male adult chicken had higher prevalence of ectoparasitic arthropods than adult females and juvenile chicken. Six species of ectoparasitic arthropods namely; Argas persicus (29.46%), Menopon gallinae (23.21%), Dermanysus gallinae (16.07%), Lipeurus caponis (12.5%), Echidnophaga gallinacea (10.71%) Goniocotes gallinae (5.36%) were recovered from infested chicken. Argas persicus with the prevalence (29.46%) was the most prevalent parasite species. Amansea community had a higher prevalence of ectoparasitic arthropods than Ifite community. The difference was statistically significant (P<0.05). In conclusion, the present study has provided information on the various ectoparasitic arthropods of domestic chicken in Amansea and Ifite communities. There was no significant difference in the prevalence of ectoparasitic arthropods between the two communities. Therefore, further study is needed to determine the impact of infestation on the health and productivity of these birds, and evaluation of cost benefit of various control strategies need to be investigated.

Experimental infection of native chicken with cattle tick Rhipicephalus (Boophilus) annulatus (Acari: Ixodidae)

Rhipicephalus (Boophilus) annulatus is considered as one of the most widespread tick species of the world on several host including cattle. The current study has been conducted to evaluated infestation ability of larval R. annulatus on chicken growth and development, Indicated very few larvae quested or fed on indigenous adult chickens when comparison with the number of larvae which used in this study, and that the larval and nymph feeding period of these ticks was very long. The number of larvae feeding shows in hollows wings, while the number of feeding nymph investigate on head, wings and above of thigh, both larvae and nymph described on the same individual adult chicken, the engorged adult female not observed while the adult male notice on chickens. Designated the weight of feeding larvae and nymphs stage is 0.32±0.04 mg and nymph’s 2.73±1.22 mg. The weight of larvae and nymph stage under mattress and feeder’s chicken 0.27±0.21 and 2.52±1.75 mg respectively, shows not significantly when compared between the weight of feeding on chickens and the weight under mattress and feeder’s chicken by larvae and nymphs stage at (P < 0.05) values according chi-square. Experimental study shows not transmissions pathogens from incubating larvae, which got from engorged female infested with Babesia spp., to adult chickens when examined their blood by Giemsa stain.