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GENETIC ANALYSIS OF GROWTH TRAITS IN RAJASRI VARIETY OF BACKYARD CHICKEN

KrishiKosh

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Title GENETIC ANALYSIS OF GROWTH TRAITS IN RAJASRI VARIETY OF BACKYARD CHICKEN
 
Creator V. VENKATESWARA REDDY
 
Contributor Dr. M. GNANA PRAKASH
 
Subject livestock, body weight, breeds (animals), genetics, sexual reproduction, biological development, biological phenomena, heritability, productivity, phenotypes
 
Description The present investigation was taken up to study the growth performance of Rajasri variety of backyard chicken developed by P.V. Narsimha Rao Telangana Veterinary University, Hyderabad, India. Data collected on 2,758 chicks produced from 77 sires and 274 dams in pedigreed full sib mating in 12 hatches during 4th generation and maintained at Poultry Research Station, Hyderabad were utilized for the present study.
Highly significant (P < 0.01) influence of hatch on body weights at birth, 1, 2, 3, 4, 5, 6, 7, 8, 12, 16, 20 and 24 weeks of age and that of sex at 2, 3, 4, 5, 6, 7, 8, 12, 16, 20 and 24 weeks of age was observed in the present study.
The overall leastsquares mean body weights at birth, 1, 2, 3, 4, 5, 6, 7, 8, 12, 16, 20 and 24 weeks of age were 31.74 ± 0.08, 46.05 ± 0.12, 69.24 ± 0.25, 97.49 ± 0.36, 135.35 ± 0.47, 177.55 ± 0.54, 234.44 ± 0.67, 307.29 ± 0.87, 409.87 ± 0.97, 712.98 ± 1.47, 1,093.85 ± 2.83, 1,376.17 ± 3.46 and 1,638.75 ± 3.64 g, respectively. Males were significantly heavier than females at all the ages studied.
Highly significant (P < 0.01) hatch and sex differences were observed among average daily gains during 1 to 24 weeks of age except for the non-significant effect of sex on average daily gains at 1, 2 and 5 weeks. The overall leastsquares mean average daily gains were 2.05 ± 0.02, 3.31 ± 0.03, 4.03 ± 0.05, 5.42 ± 0.06, 6.03 ± 0.07, 8.13 ± 0.09, 10.87 ± 0.13, 14.65 ± 0.16, 10.83 ± 0.06, 13.60 ± 0.11, 10.08 ± 0.14 and 9.38 ± 0.17g during 1, 2, 3, 4, 5, 6, 7, 8, 12, 16, 20 and 24 weeks, respectively.
The estimated heritability values for body weights at different ages varied from very low to high. The h2 through sire component ranged from 0.02 ± 0.03 (BW7 and BW24) to 0.25 ± 0.08 (BW0); through dam component ranged from 0.02 ± 0.05 (BW8) to 0.46 ± 0.08 (BW0) while through the sire + dam component the heritability
ranged from 0.04 ± 0.02 (BW7) to 0.36 ± 0.09 (BW0). In general, the heritability estimates decreased in magnitude with age.
Genetic correlations among body weights were significant and high (P< 0.01). The estimates ranged from 0.10 ± 0.01 (BW1-BW3) to 0.98 ± 0.02 (BW4-BW6) from sire component; from 0.08 ± 0.30 (BW0-BW7) to 0.99 ± 0.01 (BW2-BW3) from dam component and from 0.02 ± 0.34 (BW0-BW6) to 0.99 ± 0.01 (BW6-BW7) from sire + dam component.
The phenotypic correlations obtained among body weights were positive, significant (P < 0.01) and were low to moderate in magnitude. The estimates ranged from 0.03 (BW0-BW8) to 0.56 (BW20-BW24).
It is thus observed that there exists a significant sexual dimorphism in favour of males in Rajasri birds and the sex differences increased with age. The average daily gains has shown increasing trend up to 8 weeks and then decreased indicating that Rajasri birds can be marketed at 8 weeks if reared for meat purpose. Heritability for body weights was low to moderate and decreased with age. All the phenotypic correlations among body weights were positive and significant. Most of the genetic correlations were high and positive.
 
Date 2016-12-27T14:40:24Z
2016-12-27T14:40:24Z
2016-09-23
 
Type Thesis
 
Identifier http://krishikosh.egranth.ac.in/handle/1/93263
 
Relation D;480
 
Format application/pdf
 
Publisher PVNR TVU