پديد آورندگان :
باباجاني، صميم دانشگاه تبريز - گروه علوم دامي , عليجاني، صادق دانشگاه تبريز - گروه علوم دامي , عليايي، مجيد دانشگاه تبريز - گروه علوم دامي , جوانمرد، آرش دانشگاه تبريز - گروه علوم دامي
كليدواژه :
مولفه هاي اصلي , همبستگي پيرسون , ويژه مقدار , چند متغيره , كيفيت داخلي تخم مرغ
چكيده لاتين :
One of the main problems of multiple-trait genetic evaluation in poultry breeding is high
computing costs. Principal components analysis (PCA) is a method for reducing the number of
traits in correlated trait analysis. The aim of the present study was to determine the most
effective principal components (PCs) of internal egg quality and some performance traits of
Azarbayjan native chickens. Records were measured from 1500 native hens, including body
weight at sexual maturity (BWSM), age at first egg production (ASM), egg volume (EV), yolk
percent (YP), yolk width (YWI), yolk weight (YW), yolk Index (YI), yolk dry matter (YDM),
yolk depth (YD), yolk pH (YPH), yolk coefficient (YC), the ratio of yolk weight to albumen
weight (RYA), albumen percent (AP), Hough Unit (HU), albumen pH (APH), albumen height
(AH), albumen dry matter (ADM), albumen weight (AW). Descriptive statistics, phenotypic
Pearson coefficients and principal components analysis were evaluated using SAS software. The
results showed that the range of Pearson correlation coefficients for phenotypic traits varied
from zero to 0.98. The correlation coefficients more than 0.6 between HU and AH, YP and
RYA, YW and YC, YP and YWI, YP and YW, YP and YDM, YP and YC ،YWI and YW, YWI
and YDM, YWI and RYA, YWand RYA, YI and YD, YDM and YC, YDM and RYA, YC and
RYA, AP and AW, and ADM and AW were evaluated. The PCA analysis showed that the eight
first principal components explained about 90.21% of the total variation of internal egg quality
traits. Using PCA in internal egg quality, BWSM and ASM showed that YW, YDM, YC, YP,
RYA, YWI, AP, AH, AW and HU have great impact on the total phenotypic variance. So, this
method can be used for internal egg quality and performance trait analysis of native hens and
can reduce computing costs and time of genetic evaluation of multiple traits