Canonical Analysis for Assessment of Genetic Diversity of Three Indigenous Chicken Ecotypesin North Gondar Zone, Ethiopia
محورهای موضوعی : CamelA. Getu 1 , K. Alemayehu 2 , Z. Wuletaw 3
1 - Ebinat District Agricultural Development Office, Amahara, Ethiopia
2 - Department of Animal Production and Technology, Bahir Dar University, College of Agriculture and Environmental Science, Bihar Dar, Ethiopia
3 - Sustainable Land Management Organization, Bihar Dar, Ethiopia
کلید واژه: discriminant analysis, Morphological traits, local birds, variance estimation,
چکیده مقاله :
Rapid exploratory field survey, to identify indigenous chicken ecotypes was conducted in north Gondar zone of Ethiopia. Chicken ecotypes including Necked neck, Gasgie and Gugut from Quara, Alefa and Tache Armacheho districts were identified, respectively. Morphological variations among the three study populations and nine measurable traits were evaluated. General linear model, canonical discriminate and stepwise analyses were applied for assessing variability among the study populations. Necked neck and Gasgie ecotypes were heavier and had wider linear traits than the rest, while most of the study traits for the Gugut ecotype were the lowest. The most important variables for discriminating between the three populations were shank length, keel length, wingspan and beak length with canonical discriminant functionscore of0.897, 0.752, 0.449 and0.433, respectively. The greatest distance value was between Gasgie and Necked neck ecotype while the least one was between Gugut and Necked neck. The discriminate analysis therefore classified the three populations to be distinct clusters. The morphological traits studied have proved to be useful in genetic characterization of indigenous chickens and can thus be useful in developing strategies for conservation of the genetic diversity.
برای شناسایی اکوتیپهای طیور بومی در ناحیه گوندار شمالی اتیوپی، از آزمایش میدانی جستجوی سریع استفاده شد. اکوتیپهای طیور شامل نِکد نِک، گاسگی و گاگات به ترتیب از نواحی کوآرا، آلِفا و تاکه آرماکِهو شناسایی گردیدند. تنوع ریختشناختی بین این سه جمعیت مورد مطالعه و 9 صفت قابل اندازهگیری ارزیابی گردیدند. مدل خطی عمومی، آنالیزهای تمایز متعارف و پلکانی برای ارزیابی تنوع بین این جمعیتها مورد استفاده قرار گرفتند. اکوتیپهای نِکد نِک و گاسگی سنگینتر بوده و در مقایسه با اکوتیپ گاگات از صفات خطی وسیعتری برخوردار بودند. اکثر صفات مورد مطالعه برای اکوتیپ گاگات در پایینترین سطح قرار داشتند. مهمترین متغیرها برای تمایز بین این سه جمعیت، شامل طول ران، طول ستون فقرات، طول دو سر بالها و طول منقار بوده و نمرات تابع تمایز متعارف برای آنها بهترتیب برابر با 897/0، 752/0، 449/0 و 433/0 به دست آمدند. بیشترین مقدار فاصله بین اکوتیپهای گاسگی و نِکد نِک و کمترین فاصله بین اکوتیپهای گاگات و نِکد نِک مشاهده شد. بنابراین آنالیز تمایز این سه جمعیت را در سه خوشه جداگانه طبقهبندی نمود. بدین ترتیب نشان داده شد که صفات ریختشناختی مورد مطالعه میتوانند در تعیین هویت ژنتیکی طیور بومی مورد استفاده قرار گرفته و بنابراین میتوانند در توسعه راهبردهای حفاظت تنوع ژنتیکی به کار گرفته شوند.
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