Please use this identifier to cite or link to this item: http://krishikosh.egranth.ac.in/handle/1/5810086624
Authors: K. SURESH
Advisor: Dr. D. SREENIVAS
Title: GENETIC EVALUATION OF JUVENILE AND PRODUCTION TRAITS IN VANARAJA MALE LINE (PD-1) CHICKEN
Publisher: PVNR TVU
Language: en
Type: Thesis
Pages: 146
Agrotags: null
Abstract: The present study was aimed at evaluating the performance of Vanaraja male line (PD-1) chicken. Data collected on 2,538 chicks, progeny of 50 sires and 250 dams produced in a pedigreed full sib mating at the Directorate of Poultry Research, Hyderabad in five hatches during 12th generation, were utilized for the present investigation. The mean fertility was 84.79 percent. The mean hatchability percentage on total egg set (TES) was 77.71 and on fertile egg set (FES) was 91.64 percent. Highly significant (P≤0.01) differences among all hatches were observed for body weights and shank length. The overall least squares mean of body weights at day old, 2, 4, 6, 20, 40 and 52 weeks of age were found to be 40.50 ± 1.46, 149.46 ± 1.04, 405.71 ± 2.65, 804.27 ± 5.17, 2086.77 ± 0.96, 2772.04 ± 0.99 and 2780.97 ± 1.28 g, respectively. The overall least squares means of shank length at 4 and 6 weeks of age was 62.61 ± 1.78 and 82.41 ± 2.26 mm. Hatch of the birds significantly (P≤0.01) influenced the ASM, EW32 and EW40 and the corresponding overall means were 190.17 ± 7.00 days, 52.67 ± 1.47 and 56.90 ± 0.01 g, respectively. Significant (P≤0.05) hatch effect was observed for shell weight, shell thickness and haugh unit and the corresponding means were 5.07 ± 0.11 g, 0.32 ± 0.01 mm and 84.88 ± 0.49. The effect of hatch was also found to be significant for albumen weight (P≤0.01) and egg weight, yolk colour and yolk weight (P≤0.001) and the corresponding overall means were 30.53 ± 0.16 g and 56.94 ± 0.21 g, 7.58 ± 0.06 and 17.38 ± 0.07 g, respectively. The average pre slaughter live weight was 1905 ± 55.79 g in cocks slaughtered at 15 weeks of age and the proportions of dressing percentage, breast, leg, wing, back and neck expressed as percent of live weight were 75.14 ± 0.67, 16.42 ± 0.30, 22.82 ± 0.31, 10.39 ± 0.19, 15.29 ± 0.29 and 5.36 ± 0.16, respectively. Heritability estimates for juvenile body weights were moderate and ranged from 0.08 ± 0.11 to 0.36 ± 0.07. Moderate heritability estimates of 4 week body weight (0.34 to 0.28) indicate scope for genetic improvement on 4 week body weight which is the primary trait for selection for improving body weight. Heritability estimates for shank length were low to moderate and varied from 0.17 ± 0.06 to 0.33 ± 0.08. Higher dam component of heritability was noticed for 4 and 6 week shank length. In general, the heritability estimates xv for adult body weights were low to moderate. Heritability estimates based on sire, dam and S+D component ranged from 0.18 ± 0.26 to 0.48 ± 0.31, 0.05 ± 0.29 to 0.47 ± 0.25, 0.16 ± 0.20 to 0.44 ± 0.17, respectively. The sire component of heritability for ASM was 0.15 ± 0.25, while the heritability estimates based on sire, dam and S+D component for EP40 were 0.17 ± 0.28, 0.10 ± 0.27 and 0.14 ± 0.20, for EP52 were 0.04 ± 0.16, 0.17 ± 0.21 and 0.09 ± 0.11, respectively. The h2S, h2D and h2S+D for EW28 were 0.43 ± 0.26, 0.56 ± 0.39 and 0.49 ± 0.25 and for EW40 were 0.12 ± 0.28, 0.36 ± 0.31 and 0.24 ± 0.23, respectively. Correlations among juvenile body weights were positive, high in magnitude and ranged from 0.25 ± 0.12 to 0.93 ± 0.01. Similar positive correlations were observed between body weights and shank length at various ages ranging from 0.22 ± 0.13 to 0.85 ± 0.04. The genetic correlation of ASM with BW40 was positive and high (0.71 ± 0.45). Genetic correlation between ASM and egg weights was positive and low to high in magnitude ranging from 0.03 ± 0.60 to 0.76 ± 0.34, whereas genetic correlation of ASM with egg production was found to be negative (-0.61 ± 0.48). Genetic correlation of body weights with egg weights was positive and moderate to high ranging from 0.15 ± 0.47 to 0.75 ± 0.24. The genetic correlation of BW20 with EP40 was found to be positive, while that of BW40 with EP40 was found to be negative. Genetic correlations among egg weights were positive, whereas the genetic correlations of egg weights with egg production was found to be varied. The genetic correlations of BW52 with EW52 and EP52 were found to be positive (0.34 ± 0.31 and 0.14 ± 1.04 respectively). The genetic correlation of EW52 with EP 52 was found to be negative (-0.57 ± 0.43). Phenotypic correlations have shown also a similar trend. From the results of the study, it may be concluded that the PD-1 (Vanaraja male line) population has got reasonable variability in both the juvenile and production traits. The heritability estimates were moderate to high for body weights and shank length, the primary trait of selection for improvement. The gradual improvement in production traits in parent line will improve the performance in terminal cross “Vanaraja” with respect to shank length and body weight which ultimately benefits the farmers.
Subject: Animal Genetics and Breeding
Theme: AGB
These Type: M.V.Sc.
Issue Date: 2018-12-22
Appears in Collections:Thesis

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