Record Details

EVALUATION AND GENETIC ANALYSIS OF PRODUCTION TRAITS IN RAJASRI BIRDS

KrishiKosh

View Archive Info
 
 
Field Value
 
Title EVALUATION AND GENETIC ANALYSIS OF PRODUCTION TRAITS IN RAJASRI BIRDS
 
Creator MD. NIZAM HUSSAIN
 
Contributor Dr. S.T. VIROJI RAO
 
Subject livestock, eggs, breeds (animals), productivity, body weight, genetics, crossing over, biological phenomena, heritability, egg production
 
Description The present investigation was carried out to assess the productive and
reproductive performance of Rajasri variety of backyard chicken developed by
Poultry Research Station, P.V. Narsimha Rao Telangana Veterinary University,
Hyderabad.A total of 2931 chicks produced from 77 sires and 308 dams in 12 hatches
during 4th generation were utilized for the present investigation.
Hatch and sex of the birds significantly (P < 0.01) influenced the body weights
at 28, 32, 36 and 40 weeks of age. Significant sexual dimorphism in favour of males
was observed. The overall least squares mean body weights at 28, 32, 36 and 40
weeks of age were 1628.38 ± 3.99, 1693.36 ± 4.00, 1746.37 ± 4.18 and 1809.11 ±
4.51 g respectively.Hatch of the birds significantly (P < 0.01) influenced the AFE, EP40, EW28
and EW40 and the corresponding means were 164.74 ± 0.24 days, 61.00 ± 0.43, 42.43
± 0.08 g and 43.79 ± 0.09 g respectively. The mean fertility was 82.65 per cent. The
mean hatchability percentage on total egg set (TES) was 72.96 and on fertile egg set
(FES) was 88.02.The average egg shell weight, shell thickness, haugh unit score, albumen
index, yolk index and yolk colour were 4.45 ± 0.07 g; 0.33 ± 0.01mm; 86.31 ± 1.12;
0.09 ± 0.01; 0.44 ± 0.01 and 6.78 ± 0.16 respectively.
In general, the heritability estimates for body weights were low to moderate.
Heritability estimates based on sire, dam and S+D component ranged from 0.03 ±
0.08 (BW28) to 0.13 ± 0.09 (BW32); 0.30 ± 0.14 (BW32) to 0.47 ± 0.15 (BW36) and
0.17 ± 0.08 (BW28) to 0.27 ± 0.09 (BW36) respectively.
The dam component of heritability for AFE was 0.01± 0.06 while the
heritability estimates based on sire, dam and S+D component for EP40 were 0.06 ±
0.04, 0.05 ± 0.06 and 0.06 ± 0.04 respectively. The h2S, h2D and h2S+D were 0.19 ±0.06; 0.11 ± 0.07 and 0.15 ± 0.08 respectively for EW28 and were 0.10 ± 0.04; 0.02 ±0.06 and 0.06 ± 0.07 respectively for EW40.
Genetic correlation estimates among body weights studied were positive andhigh in magnitude ranging from 0.62 ± 0.16 (BW28 – BW40) to 0.98 ± 0.08 (BW36 –BW40). The genetic correlation of AFE with all other traits was not estimable while the genetic correlation of EP40 with body weights was negative in direction and low in magnitude. The phenotypic correlations among body weights were positive and high in
magnitude ranging from 0.50 ± 0.02 (BW28 – BW40) to 0.83 ± 0.01 (BW28 –BW32). Whereas, phenotypic correlations observed between AFE and body weightsin the present study were positive but low in magnitude, the correlation of AFE withEP40 and EW40 were negative.“Rajasri” is a synthetic variety evolved by synthetic breeding of three exotic layer breeds and local non-descript fowl. Productive performance of Rajasri birds was comparable with other backyard varieties like Grampriya, Vanaraja etc. Heritability
estimates were low to medium for body weight at different ages and low for various production traits.
 
Date 2016-12-31T13:45:48Z
2016-12-31T13:45:48Z
2016-12-31
 
Type Thesis
 
Identifier http://krishikosh.egranth.ac.in/handle/1/93803
 
Relation D;510
 
Format application/pdf
 
Publisher PVNR TVU