Genetic analysis of growth and egg production traits in synthetic colored broiler female line using animal model
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Genetic analysis of growth and egg production traits in synthetic colored broiler female line using animal model L. Leslie Leo Prince 1 R. N. Chatterjee 1
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K. S. Rajaravindra 1
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U. Rajkumar 1
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B. L. N. Reddy 1
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C. Paswan 1 & S. Haunshi 1
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Received: 5 February 2020 / Accepted: 20 June 2020 # Springer Nature B.V. 2020
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. Keywords Animal model . Variance . Genetic parameters . Colored broiler
Introduction In India, the per-capita consumption of egg and chicken meat was 79 and 3.8 kg, respectively, against the recommendations of 180 eggs and 11 kg meat/year/person by Indian Council of the Medical Research. In 2004–2005, the egg production in India was 45.2 billion, and in one and a half decade, it has grown 2.28 times and the current (2019–20) egg production is Electronic supplementary material The online version of this article (https://doi.org/10.1007/s11250-020-02340-4) contains supplementary material, which is available to authorized users. * L. Leslie Leo Prince [email protected] 1
ICAR-Directorate of Poultry Research, Rajendranagar, Hyderabad, Telangana 500030, India
103.3 billion (BAHS, 2019). The poultry industry has emerged as a bi
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