Abstract
Variance and genetic parameters were estimated for growth and production traits of synthetic broiler female line (PB-2) using REML animal model to delineate the population status, direct additive, maternal genetic, permanent environmental effects, besides genetic trends and performance of economic traits. The overall least squares mean (LSM) for body weights at 0 day (BW0), at 2 weeks (BW2), at 4 weeks (BW4), at 5 weeks (BW5), shank length at 5 weeks (SL5), and breast angle at 5 weeks (BA5) of age were 40.03 g, 207.40 g, 589.58 g, 828.51 g, 76.89 cm, and 80.78°, respectively. The overall LSM for egg production up to 40 weeks of age (EP40) and egg weight at 40 weeks (EW40) were 66.02 eggs and 58.23 g, respectively. The heritability estimates using the best model for BW0, BW2, BW4, BW5, SL5, and BA5 were 0.06 ± 0.03, 0.19 ± 0.03, 0.15 ± 0.03, 0.14 ± 0.02, 0.08 ± 0.02, and 0.02 ± 0.01, respectively. The heritability estimates were low to moderate in the magnitude for all early growth traits. The heritability estimate for egg production up to 40 weeks (EP40) was 0.30 ± 0.05. The heritability estimates for adult body weights at 20 and 40 weeks of age (BW 20 and BW 40), age at sexual maturity (ASM), and egg weight at 40 weeks (EW40) were 0.21 ± 0.04, 0.19 ± 0.04, 0.16 ± 0.03, and 0.33 ± 0.05, respectively, and the estimates were moderate to high in magnitude. Model 4 with additive, maternal permanent environmental, residual, and phenotypic effects was the best model for growth traits except for BW0 and BA5. The average genetic gain observed in primary trait (BW5) over the five generations was 13.62 g per each generation indicating effective selection. The animal model minimized the overestimation of genetic parameters and improved the accuracy of the BV, thus enabling the breeder to select the suitable breeding strategy for genetic improvement.
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Data are available at repository maintained by ICAR research data repository for knowledge management (http://krishi.icar.gov.in/jspui/handle/123456789/8886).
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The technical help received from the farm and hatchery staff is duly acknowledged.
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The institute research project was funded by Institute fund of the Indian Council of Agricultural Research—Directorate of Poultry Research, Hyderabad.
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All the authors contributed to the study conception and design. Material preparation and data collection was done by L. Leslie Leo Prince, K.S. Rajaravindra, and B.L.N. Reddy. Analysis was performed by L. Leslie Leo Prince. The first draft of the manuscript was written by U. Rajkumar. Literature search and interpretation of results was done by C. Paswan and S. Haunshi. Language and interpretation was improved by R.N. Chatterjee. All the authors read and approved the final manuscript.
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The project was approved by Institute Animal Ethics Committee (IAEC/DPR/17/4). The manuscript does not contain clinical studies and patient data.
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Prince, L.L.L., Rajaravindra, K.S., Rajkumar, U. et al. Genetic analysis of growth and egg production traits in synthetic colored broiler female line using animal model. Trop Anim Health Prod 52, 3153–3163 (2020). https://doi.org/10.1007/s11250-020-02340-4
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DOI: https://doi.org/10.1007/s11250-020-02340-4