Please use this identifier to cite or link to this item: http://krishikosh.egranth.ac.in/handle/1/5810087048
Authors: B. SRIDEVI
Advisor: Dr. S.T VIROJI RAO
Title: MOLECULAR CHARACTERIZATION AND GENETIC ANALYSIS OF PRODUCTION TRAITS IN IWD AND IWF STRAINS OF WHITE LEGHORN UNDER CONTINUED SELECTION
Publisher: PVNR TVU
Language: en
Type: Thesis
Pages: 181
Agrotags: null
Abstract: The present study was carried out for estimation of genetic parameters on certain production traits in IWD and IWF strains of white leghorn and microsatellite marker based analysis of IWD and IWF maintained at AICRP on poultry breeding Hyderabad. There were no significant differences observed for two genetic group for production traits. The age at first egg (AFE) ranged from 144.93±0.17 to 150.86±0.16 days in IWD strain and 148.48±0.26 to 159.30±0.32 days in IWF strain. The body weights in IWD and IWF ranged from 1108.85±1.23 to1324.92±2.75 and 1088.02±1.82 to 1237.27±1.90 at 16 weeks, 1169.64±1.96 to 1336.59±1.90 and 1143.5±2.06 to 1393.97±3.09 at 40 weeks, 1265.29±2.80 to 1499.60±3.97 and 1217.63±2.21 to 1501.42±4.50 g at 64 weeks respectively. Egg weight at 28, 40 and 64 weeks of age in IWD and IWF ranged from 46.05±0.07 to 49.05±0.07,45.49 ±0.06 to 50.51±0.08 , 49.82±0.05 to 54.54± 0.08,48.18 ±0.08 to 55.86 ± 0.09, 54.60±0.10 to 58.34±0.10 and 54.02±0.08 to 59.60± 0.09 g respectively. While egg production up to 40, 64 weeks of age ranged from 99.62 ±0.41 to 114.59 ± 0.19, 97.86±0.29 to 133.22±0.47, 215.07±0.93 to 250.06±0.53 and 215.07±1.25 to 246.09±0.48 eggs respectively . The heritability estimates in both the strains were low for AFE and egg weight, egg production at 40, 64 weeks, while they were low to medium for body weights at different ages studied. The genetic and environmental correlation of age at first egg with body weight was negative in IWD and positive in IWF strains. The genetic and environmental correlations of body weight with egg weight and egg production were positive in IWD and negative in IWF strain. The genetic correlations among egg weight and egg production were positive while the association between egg weight and egg production traits were negative in both the strains. All the 10 microsatellite loci studied were proved less polymorphic. The mean allele (Na) varied from 2 to 4 among the loci and 3.2 ± 0.16 to 3.10± 0.23 among the populations. The effective number of alleles varied from 2.09 ± 0.10 and 2.06 ± 0.15 among two populations. The allele frequency ranged from 0.008 to 0.75 among the populations. The PIC values ranged from 0.40 to 0.62 among the populations with an overall mean of 0.51 ± 0.03. The mean expected heterozygosity across the loci and among the populations ranged from 0.24 to 0.59, 0.21 to 0.60 with an overall mean of 0.48 ± 0.027. The mean observed heterozygosity across the loci and among the populations ranged from 0.01 to 0.45, 0.03 to 0.04 with a mean of 0.26 ± 0.05. The estimated genetic distance between the two populations was 0.049. The phylogenetic analysis revealed that the two populations were grouped into three main clusters viz., Cluster I, II and III. The clusters are further subdivided into sub-clusters. All the populations are distributed in all the clusters. All the loci departed from the equilibrium frequency in populations studied. The Loci MCW29 in IWF and loci MCW0110 in IWD demonstrated non-significant deviation while all other loci had significant deviation at P<0.001, 0.01 and 0.05 on overall basis. The study of Fixation indices revealed that all individuals of both strains the alleles at loci MCW104 in IWF-IWD were fixed as the coefficient of inbreeding was 1.00. All the 10 loci showed positive inbreeding coefficients in one or the other populations indicating the presence of inbreeding.IWD showed maximum alleles 4 for only 3 loci whereas IWF showed for 4 loci.In both the strains the PIC values are ranged from 0.23-0.64 indicated moderate polymorphism for alleles.
Subject: Animal Genetics and Breeding
Theme: AGB
These Type: M.V.Sc.
Issue Date: 2018-10-12
Appears in Collections:Thesis

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