Browsing by Author "Salako, A. E."

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Effects of stocking density and season on growth performance and welfare of broiler chickens in Ibadan, Nigeria
(2017) Ademulegun, T. I..; Adeyemo, G. O.; Salako, A. E.
The study was carried out to investigate the effects of season and stocking density on the growth performance and welfare of broiler chickens in Ibadan, Nigeria. In a seven-week feeding trial, a total of 96 one-week old Arbor Acre broiler chickens were randomly distributed to three stocking densities (birds/m2) of 10, 12, and 14 at the rate of 32 birds per stocking density (SD) during each season; Late Wet (LWS) and Late Dry (LDS). Total Feed Intake (TFI, g), Final Live Weight (FLW, g), Feed Conversion Rate (FCR), Live weight/m2(LW/m2), Normal Gait Score(NGS,%), Survival Rate(SR %), Heterophil: Lymphocyte(H:L) ratio, were assessed. Data were subjected to statistics analysis (ANOVA at α0.05). Birds raised during LWS had higher TFI (4756.60) than LDS birds, while SD had no effect on TFI. Birds on SD of 14 birds/m2 had lower FLW. The FCR was lower during LDS and on SD 10 and 12 Birds/m2. The LW/m2 was higher in birds on SD 14birds/m2. The LWS had higher NGS and lower H:L ratio. Season and SD had no effect on SR. The NGS and H:L were not affected by SD. Broiler chickens could be raised at stocking density of 14birds/m2 during either of the seasons.
Genetic Diversity Between Exotic And Nigerian Indigenous Turkey At Different Structural Loci
(2018) Folorunsho, C. Y.; Salako, A. E.; Osaiyuwu, O. H.
Poultry genetic resources in general are considered to be the most endangered and under-conserved, detailed attention is therefore needed on the existing genetic resources to reduce or prevent the increasing genetic erosion of local livestock. This study was conducted to characterize and estimate genetic diversity in Nigerian indigenous turkey and exotic turkey using blood proteins (Haemoglobin, Transferrin and Albumin) and enzyme (Carbonic Anhydrase and Esterase 1) markers. A total of 110 turkeys comprising 50 Nigerian indigenous turkeys and 60 exotic turkeys were used for the analysis. Separation of blood protein genotypes was achieved using cellulose acetate electrophoresis. The populations were characterized for their genetic variability using allele frequencies, observed heterozygosity, F-statistics (FIT, FIS, FST), test for Hardy-Weinberg and Genetic distance. Eleven variants were found at the five loci studied, two co-dominant allele A and B controlling three genotypes AA, AB, and BB were observed at Haemoglobin, Carbonic Anhydrase, Albumin and Esterase1 loci for both indigenous and exotic turkey breeds, a third allele C was observed in Transferrin locus. Allele A was the most frequency at the Hb, CA, Alb and Es1 locus in Nigerian indigenous turkey with frequencies 0.541, 0.541, 0.520, and 0.520 respectively and exotic turkey at Hb, Alb, and Es1 with frequencies 0.508, 0.617, and 0.508 respectively. Chi Square result indicated deviations from Hardy Weinberg equilibrium in the two populations. The average heterozygosity values were 0.56 and 0.477 indicating high genetic variability, heterozygote excess FIT was estimated at -0.050 while within breed excess as evaluated by FIS ranged from 0.370 to -0.336. The fixation index FST revealed that genetic diversity within the studied population was slightly differentiated. Genetic distance among the populations quantified through calculation of Nei’s Genetic distance was 0.008 while the identity was 0.992. Similarity in the estimated genetic variability parameters between the breeds indicates that the populations are closely related and there were no appreciable differences among them. This result obtained may be used as an initial guide in defining objectives for further investigations of genetic diversity and developing conservation strategies.
Genetic Diversity of Prolactin Gene in Japanese Quail (Coturnix coturnix japonica) as Affected by Location in Nigeria
(2016) Eichie, O.F.; Salako, A. E.; Osaiyuwu, O. H.; Aggrey, S. E.
Restriction fragment length Polymorphism (RFLP) marker was used to investigate the effect of location on polymorphism, relationship and population structure with respect to prolactin gene (PRL gene) in Japanese quails in Nigeria. Blood samples were collected from thirty quails each from 5 different regions (North, South, West, East and North Central), for PRL loci analysis. DNA was extracted from the samples. Polymerase chain reaction (PCR) and electrophoresis was used to characterize a 24 base pair (bp) insertion/deletion (Indel) in a 358 bp PCR product. The populations were characterized for their genetic variability using allele frequencies, polymorphic information content, observed heterozygosity (Ho), genetic distance (D), F-statistics (FIT, FIS, FST), analysis of molecular variance, test for Hardy-Weinberg Equilibrium (H-WE) and cluster analysis. Two alleles A (0.35 to 0.63) and B (0.37 to 0.65) were observed at the PRL gene loci. The highest FIT was recorded between 0.10 (East) and 0.19 (North) indicating inbreeding within the population. The FIS among populations were between 0.09 (North central) and 0.14 (North) while FST ranged from 0.001 (North central) to 0.06 (North), indicating moderate genetic differentiation among populations. Chi Square result indicated that the population were not in H-WE. The phylogenetic relationships showed that the population from the 5 regions had common descent. Clusters from the combined population showed that PRL gene is based on individual genotype and not location. AMOVA analysis showed that 3% of the total genetic variation was explained by population difference, 19% by variation among individuals and 77% within individuals. The results showed that study of prolactin gene diversity is useful for decision making for selective breeding and conservation strategies for Japanese quails irrespective of the location.
The comparative susceptibility of commercial and Nigerian indigenous chicken ecotypes to Salmonella gallinarum infection
(Faculty of Veterinary Medicine, Usmanu Danfodiyo University, Sokoto, Nigeria, 2013) Ogie, A. J.; Salako, A. E.; Emikpe, B. O.; Amosun, E. A.; Adeyemo, S. A.; Akinoluwa, P. O.
This study was to evaluate thè possible genetic resistance of exotic and indigenous chicks to Salmonella gallinarum. A total of 72 nine weeks-old chicks were used for thè study. The Fulani ecotype (Fulani smooth feathers - FSF), Yoruba ecotype (Yoruba smooth feathers - YSF), and thè Exotic breed (Nera Black) chicks were infected with a dose of S. gallinarum (8.3 x IO6 CFU) and were observed for 16 days. Evaluation of resistance was based on clinical signs, mortality, pathology, leukocyte count, bacterial count from liver and spleen of infected chicks. The highest peak for clinical signs in 5. gallinarum infected chicks coincides with highest mortalities recorded on day 11-12 dpi and bacterial count of both liver and spleen on day 8. The lymphocytes count declined on day 8 for all thè experimental chicks except for thè exotic breed. There was no significant difference between thè bacterial counts of thè different groups on day 8. In S. gallinarum infected chicks, 94.4% of all thè chicks showed clinical signs after infection, thè exotic breed showed a prolonged clinical signs while thè Yoruba ecotype showed thè least. 87.5%, 80.0% and 37.5% mortality were recorded in thè exotic breed, Fulani and Yoruba ecotypes respectively. The study showed that thè exotic chicken (Nera Black) was more susceptible to Salmonella gallinarum infection. It also indicated that within thè ecotypes in Nigeria, Fulani ecotype was more susceptible to Salmonella gallinarum infection than thè Yoruba ecotype. The lower clinical signs and mortality observed in Yoruba ecotype indicated a resistance of thè ecotype to 5. gallinarum infection.
The possible genetic influence on the susceptibility of exotic, Fulani, and Yoruba ecotype indigenous chickens to experimental Salmonella enteritidis
(Fundación CIPAV, Cali, Colombia, 2012) Ogie, A. J.; Salako, A. E.; Emikpe, B. O.; Amosun, E. A.; Adeyemo, S. A.; Toyosi, O. A
This study was conducted to evaluate the possible genetic resistance of exotic and indigenous chicks to Salmonella enteritidis. A total of 72 9 weeks old chicks were for this study which include the Fulani ecotype (FSF), Yoruba ecotype (YSF), and the Exotic breed (Black Nera cockerel). Chicks were infected with 3.8 x104 CFU of S. enteritidis and were observed for 16 days. Evaluation of possible genetic resistance was based on clinical signs, mortality and differential leukocytes count of infected chicks. Clinical signs were evident on day 3 with eighty three percent (83.3%) of the chicks showing severe clinical signs on day 8 post infection. The exotic breed had the most prolonged clinical signs with all the chicks showing severe clinical signs. Yoruba ecotype had the shortest timing for the clinical signs, with 62.5% of the Yoruba ecotype affected. 87.5% of the Fulani ecotype and 98% of the exotic breed were affected. No mortality was recorded with the chicks infected with S. enteritidis. Assessing the clinical signs observed from infected chicks revealed that Yoruba ecotype is the least susceptible. The result from the study also indicated that the exotic is more susceptible to Salmonella infection than the indigenous chicks. It also revealed that within the ecotypes in Nigeria, Fulani ecotype is more susceptible to Salmonella infection than the Yoruba ecotype. The differential susceptibility and the low mortality observed in Yoruba ecotype indicated probable genetic resistance to S. enteritidis