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Published investigations on the morphometric and visible traits evidences. Variability in the Nigerian Indigenous. Correspondence to:. SUMMARY: Red cells extracted from blood samples taken by jugular venipuncture from a total of thirty-six traditionally managed adult West African Dwarf rams and ewes were subjected to starch gel electrophoresis, stained to reveal the activities of different allelemorphs at hemoglobin locus and analyzed. The studies was aimed at examining genetic dominang as well as pattern dominamt segregation at the locus and exampl possible association that might exist between the phenotypes and selected zoometrical traits.
What are the three phases of nurse-patient relationship the three theoretically phenotypes expected to be produced in the population what is an example of a dominant allele the two co-dominant alleles identified, only allelle HbAA and HbAB were observed. The observed what is an example of a dominant allele frequencies conformed to Hardy-Weinberg's equilibrium.
Proportion of polymorphic loci was Investigation showed that the Mendelian segregation at the loci tested was not congruent with dominamt quantitative traits vis-à-vis horn and hair lengths tested. The hemoglobin phenotypes are independent of the traits tested. El objetivo del estudio fue examinar la variación genética, así como el patrón de segregación en el locus, y develar la posible asociación que puede existir entre los fenotipos y los rasgos zoométricos seleccionados.
De los tres fenotipos teóricamente esperados a ser producidos en la población por los dos alelos co-dominantes identificados, sólo dos: HbAA y HbAB fueron observados. Las frecuencias genotípicas observadas se conformaron de acuerdo al equilibrio de Hardy-Weinberg. La investigación mostró que la segregación mendeliana en los loci probados no fue congruente con los rasgos cuantitativos investigados vis-à-vis de longitud de cuernos y pelo.
Los fenotipos de hemoglobina son independientes de las características de la prueba. Palabras clave: Alelos de hemoglobina; Oveja enana del Oeste; Características métricas; Polimorfismo. The West African dwarf sheep WAD of Nigeria are of various origins and have qhat grouped into three types based on morphological and productivity characters. As a result, the population what is an example of a dominant allele the southwest Nigeria is considered largely to be homogeneous. However, because indigenous sheep are known to contain higher degrees of variation within than between breed groups, the genetic pool of the resource revealed by electrophoresis needs to be characterized and variability exmaple the variety unveiled.
Hemoglobin, an important erythrocyte protein inherited by co dominance in a Mendelian fashion has been reported to be a useful marker through which many economic traits with which it is associated have been improved in farm animals. Variability at this locus is also analyzed to examine its degrees of association with some visible traits thereby widening the scope of its usefulness as genetic markers such as increasing accuracy of selection targeted at what is an example of a dominant allele improvement of economic traits within the breed.
Though each was documented to be largely homogenous, indigenous sheep have been characterized by higher degree of variability within than even between groups indicating their high content of genetic variation and their potentials as main reservoir of unique genes which could be valuable even to the industrialized nations whenever environmental concerns necessitates changes in production system. The poor documentation in the breed necessitates the investigation of the extent of variation present among them by using tools other than traditional body measurements.
More so Evaluation of the variety from Data other than the morphological is scarce. Recent advances in the field of molecular genetics have evolved new procedures for investigating variability among animal populations. These range from elecrophoretic detection what are the 5 steps of root cause analysis polymorphism of gene products at structural loci to Deoxyribonucleic acid DNA analysis.
Other procedures such as serological and. Nigeria immunogenetic analysis have enhanced the investigations. These procedures are important as they are more precise, have furnished higher levels of genetic variation and localize important loci which can prove to be reliable genetic markers for some economic traits, visible traits and livestock diseases and as such have doubled even as time savers to aid precision in selection for genetic improvement and sustainable productivity. For what is an example of a dominant allele, FAO reported that carriers of hemoglobin A have both demonstrated significant resistance against helminth infections.
Due to the better functional properties such as og affinity for oxygen and higher hemoglobin concentration and packed cell volume Di Stasio, This study focuses on identification of genetic diversity among the WAD sheep of the Southwest Nigeria through electrophoretic detection of polymorphism at hemoglobin locus. It is further intended to investigate the relationship if any between detected hemoglobin variants and some traits in the variety in order to contrast their validity as genetic markers.
The animals used for this study were obtained from several small holder flocks selected within the humid southwest Nigeria. Traditional flocks within this area usually average 5 individuals comprising males and females in ratio These were extensively managed random mating population where characteristically animals browsed road side plants and settle to kitchen wastes only when available. No particular shelter or even veterinary care is provided. A what is an example of a dominant allele of thirty-six animals were used.
Sampled animals were adults within breeding age group. An average of five animals was sampled per flock. Blood collection and preparation. Each blood sample was washed with saline and lysed using distilled water. Laboratory analysis. In order of decreasing mobility dictated by the molecular weight of the heterogeneous forms of bHb, bHbA and bHbB were designated in a banding pattern.
The resulting frequencies of the allele corresponding to the banding pattern were estimated by direct count. Morpholometrical characters. Quantitative characters: Hair and horn length were recorded for each sampled individuals. Hair length was obtained by pulling two or more hair fibre from the primary follicle of the right side ineach case. The strands were measured in centimeters with tape and the average recorded. Horn length was also recorded as the distance from the based to the tips of the horn measured along the curved structure.
What is an example of a dominant allele two horns were measured and the average taken in centimeters. These were recorded according to the sexes and entered into the computer for statistical analysis. Statistical analysis. Hemoglobin genotype and gene frequencies were estimated as follows:. The molecular form of the polypeptide fraction of the globin molecule that migrated toward the anode under the electric field was os aHb while the fraction that migrated to the cathode was labeled bHb.
Out of he three phenotypes that could theoretically emerge from the two co-dominant alleles, only two was observed in the sample: the homozygote HbAA and the heterozygote HbAb. The frequency of HbA was higher than that of HbB being This same trend has already been reported in Yankasa sheep for the same region Tella et al. In some exotic sheep for example, Lebrijan Churro breed of Andalusia, Rodero et al.
The population conforms to Hardy-Weinberg's equilibrium What is an example of a dominant allele frequencies were 0. This demonstrates the predominance of allele A over B in the population. It follows that if bHbA confers genetic resistance to helminth infection as speculated in the West African sheep, the tested population should be resistant although this was not tested in this what is stored in knowledge database of expert system. The practice of recurrent selection against allele B could therefore represent a significant reduction in the overall cost of production of mutton.
Through a reduced maintenance cost and mortality via helminth diseases Table II represent the mean and standard deviation of the lengths of hair and horn measured. Results showed sexual dimorphism. This is reflected by the significance of the difference observed between the mean values: 9. The associated standard deviations are high and suggest opportunity for improvement of the features through selection within species even when association with Hb is ignored.
More importantly, the longer hair and horns in the rams than the ewe as shown in table 3 corresponds to low frequency of HbAA 0. It also showed that all the individuals with HbAB are females. Whah we can claim and attribute higher associate frequency of HbAA to females as observed here is subject to confirmation from further investigation the must use a higher sample size. The relationship among the length and genotypes reported in table 3 further showed that hair and horn length were longer for HbAA than HbBB phenotype.
There is tentative evidence to show that animals with AA hemoglobin types have longer hair and length. After this relationship is established in further dominnt, the genotype AA could then serve as marker when selecting for long hair for improvement allee especially among dojinant breeds whose coast fibres are of relatively high economic importance. HbAA carriers will then play double role because its longer hair combined with genetic resistance to helminth infestation confers upon it a selective domonant when compared with other hemoglobin phenotypes.
Adu, I. The indigenous sheep of Nigeria. World Rev. Boyer, S. Modified apparatus for starch gel electrophoresis. Di Stasio, L. Biochemical genetics In: Genetics of sheep. Piper, L. Animal genetic resources conservation by management, data banks and Training. Rome, FAO, Rodero, Surfing the web at home is an example of informal learning. Genetics and phenotypic profile of endangered Andalusian sheep and goat breeds.
Salako, A. Schillhorn van Veen, T. The hemoglobin types of Nothern Nigerian sheep. Smithies, O. Zone electrophoresis in starch gels; group variation in is love a bad word proteins of normal dlminant adults. Tella, M. The influence of hemoglobin types of the incidence of babesiosis and anaplasmosis in West African Dwarf and Yankasa sheep. Vet J. Email: aesalak yahoo. Received: Accepted: Servicios Personalizados Revista.
Variability in the Nigerian Indigenous Correspondence to: SUMMARY: Red cells extracted from blood samples taken by jugular venipuncture from a total of thirty-six traditionally managed adult West African Dwarf rams and ewes were subjected to starch gel electrophoresis, stained to reveal the activities of different allelemorphs at hemoglobin locus and analyzed. Material and method The animals used wllele this study were obtained from several small holder flocks selected within the humid southwest Nigeria.
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