Multivariate analyses of morphological traits in indigenous chicken populations of Metekel zone, Northwestern Ethiopia

2016 ◽  
Vol 59 ◽  
pp. 15-25 ◽  
Author(s):  
Fasil Getachew ◽  
Solomon Abegaz ◽  
Abraham Assefa ◽  
Manaye Misganaw ◽  
Yibrehu Emshaw ◽  
...  
Keyword(s):  
Discriminant Analysis ◽  
Conservation Strategies ◽  
Stepwise Discriminant Analysis ◽  
Indigenous Chicken ◽  
Chi Square ◽  
Discriminating Power ◽  
Qualitative Variables ◽  
Agroecological Zones ◽  
On Farm ◽  
Metekel Zone

Summary An exploratory survey to phenotypically characterize indigenous chicken populations was carried out in Metekel zone of Northwestern Ethiopia in April 2013. A total of 69 males and 244 females were sampled to record their qualitative and quantitative traits. Eight quantitative and 16 qualitative variables were measured. Sampling included three districts representing different agroecological zones. Coefficient of variation for quantitative variables ranged from 6.38 to 52.37 percent in male sample populations and 4.59–21.4 percent in females. The chi-square tests for plumage colour of the neck, ear lobe colour and skeletal variant type were highly significant (χ 2 < 0.05). The correct classification percentage from discriminant analysis was 93.73 and 98.41 percent for male and female sample populations, respectively, indicating the homogeneity of the chicken populations within districts. The stepwise discriminant analysis identified five variables for male and three variables for female sample populations, which had the highest discriminating power. Canonical analyses showed that differences in body measurements between indigenous chicken populations were highly significant (P <0.0001). The results obtained from on-farm performance evaluation indicated that the average age at first lay of hens, number of chicks weaned and mean number of eggs laid per bird per year were 5.5 months, 6.5, 50.1, respectively. This information will constitute the basis for further characterization and development of conservation strategies for indigenous chicken populations of Northwestern Ethiopia.

Chance Significances in Case-Control Studies when Using a Long Questionnaire

1980 ◽  
Vol 19 (04) ◽  
pp. 215-219 ◽  
Author(s):  
H. Scherg
Keyword(s):  
Discriminant Analysis ◽  
Statistical Tests ◽  
Contingency Tables ◽  
Case Control ◽  
Stepwise Discriminant Analysis ◽  
Case Control Studies ◽  
Chi Square ◽  
Data Set ◽  
Random Samples ◽  
Chi Square Analysis

The problem of getting per chance significant differences in case—control studies mostly arises when using a long questionnaire or when comparing a large number of characteristics. The number of chance significances increases with the number of statistical tests carried out. Chance significance is demonstrated on a set of empirically collected data divided into two nonsense groups. The variation of chance significances is shown in several random samples from this data set. Chi square analysis of 2 × 2 contingency tables and stepwise discriminant analysis are applied. Suggestions for avoiding chance significances are made. Attention is called to the hazards of stepwise discriminant analysis.

scholarly journals Assessment of Poverty by Municipalities in the Context of Population Ageing—The Case of Małopolskie Voivodeship

2021 ◽  
Vol 13 (5) ◽  
pp. 2563
Author(s):  
Małgorzata Ćwiek ◽  
Katarzyna Maj-Waśniowska ◽  
Katarzyna Stabryła-Chudzio
Keyword(s):  
The Elderly ◽  
Research Problem ◽  
Point Of View ◽  
Computer Assisted ◽  
Chi Square ◽  
Social Challenge ◽  
Depth Analysis ◽  
Qualitative Variables ◽  
Chi Square Test ◽  
Research Gap

This article undertakes the research problem of the assessment of the significance of poverty as a social challenge for local self-government units, and the differences in the assessment of the incidence of this phenomenon depending on the type of municipality. The authors also analyse the relationships between the ageing of the population and the assessment of the extent of poverty by municipalities. It must be pointed out that the undertaken problem has not been a subject of in-depth analysis thus far. Hence, this article fills the identified research gap in this field. The empirical part is based on the results of our own research, conducted using the Computer-Assisted Web Interview (CAWI) method on a sample of 144 municipalities of the Małopolskie Voivodship (Poland). In order to verify whether there is a relationship between the researched qualitative variables, the chi-square test of independence was used. In order to determine the relationships occurring between the categories of variables characterising the scale of the incidence of poverty and the remaining variables, a correspondence analysis was conducted. The research enabled us to find the issue of poverty to be one of the most important social problems from the point of view of municipalities. It is also worth noting that the degree of ageing in the population has an impact on the assessment of poverty among the elderly.

scholarly journals Relationship between oral habits and spirometry maneuvers, in children

Revista CEFAC ◽  
2018 ◽  
Vol 20 (1) ◽  
pp. 37-43
Author(s):  
Rafaela Coelho Minsky ◽  
Tayná Castilho ◽  
Roseane Rebelo Silva Meira ◽  
Tatiana Godoy Bobbio ◽  
Camila Isabel Santos Schivinski
Keyword(s):  
Healthy Children ◽  
Chi Square ◽  
Cross Sectional ◽  
Public And Private ◽  
Oral Habits ◽  
Qualitative Variables ◽  
Chi Square Test ◽  
Kolmogorov Smirnov ◽  
Thumb Sucking ◽  
Smirnov Test

ABSTRACT Purpose: to analyze whether deleterious oral habits can influence the number of attempts of forced spirometry maneuvers performed by healthy children. Methods: this observational and cross-sectional analytical study included 149 healthy children aged 6-12 years attending public and private schools in Florianópolis, SC, Brazil. A validated protocol was applied for the analysis of deleterious oral habits. The children were grouped according to the number of spirometry maneuvers needed to achieve successful spirometry results, as follows: G1) children who needed 3 maneuvers; G2) 4 maneuvers; G3) 5-8 maneuvers. Data were analyzed with the Kolmogorov-Smirnov test and the Kruskal-Wallis test was applied to compare quantitative variables between the groups. The Chi-square test was used to assess the association between the groups and qualitative variables. Results: there was no association between the number of attempts and the qualitative variables evaluated by the protocol. There was also no difference between the groups regarding quantitative variables for breastfeeding time, breastfeeding occurrence, use of pacifiers, and thumb sucking. Conclusion: the presence of DOH did not influence the number of forced spirometry maneuvers, performed by the healthy children in this study.

scholarly journals Managing Ammonia Emissions from Dairy Cows by Amending Slurry with Alum or Zeolite or by Diet Modification

2001 ◽  
Vol 1 ◽  
pp. 860-865 ◽  
Author(s):  
John J. Meisinger ◽  
Alan M. Lefcourt ◽  
Jo Ann S. Van Kessel ◽  
Victor Wilkerson
Keyword(s):  
Dairy Cows ◽  
Nitrogen Sources ◽  
Neutral Detergent Fiber ◽  
Wind Tunnels ◽  
Conservation Strategies ◽  
Nh3 Volatilization ◽  
Available N ◽  
Lactating Dairy Cows ◽  
Potential Contributor ◽  
On Farm

Animal agriculture is a significant source of atmospheric ammonia. Ammonia (NH3) volatilization represents a loss of plant available N to the farmer and a potential contributor to eutrophication in low-nitrogen input ecosystems. This research evaluated on-farm slurry treatments of alum or zeolite and compared three diets for lactating dairy cows in their effectiveness to reduce NH3 emissions. NH3 emissions were compared using a group of mobile wind tunnels. The addition of 2.5% alum or 6.25% zeolite to barn-stored dairy slurry reduced NH3 volatilization by 60% and 55%, respectively, compared to untreated slurry. The alum conserved NH3 by acidifying the slurry to below pH 5, while the zeolite conserved ammonia by lowering the solution-phase nitrogen through cation exchange. The use of alum or zeolite also reduced soluble phosphorus in the slurry. NH3 loss from fresh manure collected from lactating dairy cows was not affected by three diets containing the same level of crude protein but differing in forage source (orchardgrass silage vs. alfalfa silage) or neutral detergent fiber (NDF) content (30% vs. 35% NDF). NH3 losses from the freshly excreted manures occurred very rapidly and included the urea component plus some unidentified labile organic nitrogen sources. NH3 conservation strategies for fresh manures will have to be active within the first few hours after excretion in order to be most effective. The use of alum or zeolites as an on-farm amendment to dairy slurry offers the potential for significantly reducing NH3 emissions.

scholarly journals Dysmenorrhea in students: Characteristics and predictors

2020 ◽  
Vol 3 (2) ◽  
pp. 75-80
Author(s):  
Fatima Abid ◽  
Musa Aamer ◽  
Samira Faiz ◽  
Fahad Azam ◽  
Abida Shaheen ◽  
...  
Keyword(s):  
Social Sciences ◽  
Physical Activity ◽  
Undergraduate Students ◽  
Primary Dysmenorrhea ◽  
Chi Square ◽  
Young Females ◽  
Stress Symptoms ◽  
High Prevalence ◽  
Qualitative Variables ◽  
The Impact

Introduction: Dysmenorrhea is a very common reproductive issue present in young females that severely impacts their life. Objectives: To determine the prevalence of primary dysmenorrhea amongst undergraduate students of Pakistan, the association of dysmenorrhea with various factors, and the impact on academic performance. Methodology: An observational study was carried out at different Pakistani universities. The data was collected using a self-designed, pre-tested questionnaire. which was distributed online. The data was analyzed using IBM Statistical Package for Social Sciences (SPSS) version (Armonk, NY) 26.0. Descriptive statistics were applied for qualitative variables. Mean and standard deviation were calculated for quantitative variables. Chi-square was applied to determine if the differences in cycle length were significantly related to dysmenorrhea. T-tests were applied to determine if there were significant differences in age and body mass index in participants with dysmenorrhea. Result: There were 226 students who had participated in the study. There were 193 (85.40%) participants who reported experiencing dysmenorrhea out of which 97 students (50.26%) took a drug or a combination of drugs to alleviate the pain. There was a high prevalence of stress symptoms associated with dysmenorrhea with fatigue after sleep (p<0.05). Physical activity did not have any effect on dysmenorrhea. Physical activity, the average grade of pain, and the presence of pain in each cycle were significant predictors of dysmenorrhea (p<0.05). Conclusion Physical activity and characteristics of pain, such as cyclical nature and intensity, are predictors of dysmenorrhea. 

scholarly journals Diagnostic, therapeutic and prognostic aspects of uterine synechiae managed by hysteroscopy in the gyanecological endoscopic surgery and human reproductive teaching hospital

2017 ◽  
Vol 7 (1) ◽  
pp. 56
Author(s):  
Etienne Belinga ◽  
Isidore Tompeen ◽  
Claude Cyrille Noa Ndoua ◽  
Junie Metogo Ntsama ◽  
Sandrine Mendibi ◽  
...  
Keyword(s):  
Past History ◽  
Cross Sectional Study ◽  
P Value ◽  
Chi Square ◽  
Cross Sectional ◽  
Qualitative Variables ◽  
Preoperative Diagnostic ◽  
Chi Square Test ◽  
Human Reproductive ◽  
History Of

Background: Uterine synechiae refers to a total or partial union of the inner walls of the uterus resulting from endometrial trauma. It is a cause of reproductive failure. Until now, synechia was not optimally treated and has remained understudied in Cameroon. Objective of present study was to Evaluate the diagnostic, therapeutic and prognostic aspects of uterine synechiae treated by hysteroscopy.Methods: We conducted a descriptive cross-sectional study with an analytical component from January 1st 2015 to July 31st 2017 at Yaounde. All patients diagnosed with uterine synechiae and treated with hysteroscopy were our sample. Sampling was consecutive. The chi-square test was used for the comparison of qualitative variables and Fisher's test for ANOVA variance analysis. The comparison of the averages was made by the Student's test. P-value less than 0.05 was considered as statistically significant.Results: Hysteroscopies were indicated for uterine synechiae in 14.50%. Nulliparous were 56.67%. A history of curettage/aspiration was present in 66.66%. All of the patients had a form of infertility and 83.33% had menstrual disorders. Hysterosalpingography showed a better sensitivity (88%). After hysteroscopic treatment, 63.30% had a complete anatomical restitution. There is a significant correlation between the stage of severity of synechia and anatomical restitution (p=0.008; Spearman correlation coefficient=-0.477).Conclusions: Uterine synechiae represent one-sixth of all indications for hysteroscopy and present clinically as menstrual disorder associated with infertility. A past history of uterine curettage is common. Hysterosalpingography has a better preoperative diagnostic sensitivity. Hysteroscopy allows optimal treatment.

scholarly journals Genome-wide genetic structure and selection signatures for color in 10 traditional Chinese yellow-feathered chicken breeds

2020 ◽  
Author(s):  
Xunhe Huang ◽  
Newton O. Otecko ◽  
Minsheng Peng ◽  
Zhuoxian Weng ◽  
Weina Li ◽  
...  
Keyword(s):  
Genetic Structure ◽  
Population Genomics ◽  
Biochemical Properties ◽  
Conservation Strategies ◽  
Potential Candidate ◽  
Solute Carrier Family ◽  
Indigenous Chicken ◽  
Genome Wide ◽  
Yellow Color ◽  
Solute Carrier

Abstract Background: Yellow-feathered chickens (YFCs) have a long history in China. They are well-known for the nutritional and commercial importance attributable to their yellow color phenotype. Currently, there is a huge paucity in knowledge of the genetic determinants responsible for phenotypic and biochemical properties of these iconic chickens. This study aimed to uncover the genetic structure and the molecular underpinnings of the YFCs trademark coloration. Results: The whole-genomes of 100 YFCs from 10 major traditional breeds and 10 Huaibei partridge chickens from China were re-sequenced. Comparative population genomics based on autosomal single nucleotide polymorphisms (SNPs) revealed three geographically based clusters among the YFCs. Compared to other Chinese indigenous chicken genomes incorporated from previous studies, a closer genetic proximity within YFC breeds than between YFC breeds and other chicken populations is evident. Through genome-wide scans for selective sweeps, we identified RALY heterogeneous nuclear ribonucleoprotein (RALY), leucine rich repeat containing G protein-coupled receptor 4 ( LGR4 ), solute carrier family 23 member 2 ( SLC23A2 ), and solute carrier family 2 member 14 ( SLC2A14 ), besides the classical beta-carotene dioxygenase 2 ( BCDO2 ), as major candidates pigment determining genes in the YFCs. Conclusion: We provide the first comprehensive genomic data of the YFCs. Our analyses show phylogeographical patterns among the YFCs and potential candidate genes giving rise to the yellow color trait of the YFCs. This study lays the foundation for further research on the genome-phenotype cross-talks that define important poultry traits and for formulating genetic breeding and conservation strategies for the YFCs.

scholarly journals BETTER ALTERNATIVES FOR STEPWISE DISCRIMINANT ANALYSIS

2015 ◽  
Vol 1 (311) ◽  
Author(s):  
Katarzyna Stąpor
Keyword(s):  
Feature Selection ◽  
Discriminant Analysis ◽  
Tabu Search ◽  
Stepwise Discriminant Analysis ◽  
Selection Methods ◽  
Discrimination Power ◽  
Statistical Software ◽  
Software Packages ◽  
Benchmark Datasets

Discriminant Analysis can best be defined as a technique which allows the classification of an individual into several dictinctive populations on the basis of a set of measurements. Stepwise discriminant analysis (SDA) is concerned with selecting the most important variables whilst retaining the highest discrimination power possible. The process of selecting a smaller number of variables is often necessary for a variety number of reasons. In the existing statistical software packages SDA is based on the classic feature selection methods. Many problems with such stepwise procedures have been identified. In this work the new method based on the metaheuristic strategy tabu search will be presented together with the experimental results conducted on the selected benchmark datasets. The results are promising.

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