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Asian-Australas J Anim Sci > Accepted Articles
DOI: https://doi.org/10.5713/ajas.18.0690    [Accepted] Published online January 2, 2019.
Genetic parameters and inbreeding effects for production traits of Thai native chickens
Siriporn Tongsiri1,3,*  , Gilbert M. Jeyaruban1, Susanne Hermesch1, Julius H.J. van der Werf2, Li Li1, Teerachai Chormai3
1Animal Genetics and Breeding Unit is a joint venture of NSW Department of Primary Industries and University of New England, Armidale, Australia
2School of Environmental and Rural Science, University of New England, Armidale, NSW 2350, Australia
3Kabinburi Livestock Research and Breeding Center, Bureau of Animal Husbandry and Genetic Improvement, Department of Livestock Development, Prachin Buri 25110, Thailand
Correspondence:  Siriporn Tongsiri, Tel: +61-6773-2945, Fax: +61-6773-3266, Email: stongsir@myune.edu.au
Received: 12 September 2018   • Revised: 30 October 2018   • Accepted: 29 November 2018
Objective: Estimate genetic parameters, the rate of inbreeding, and the effect of inbreeding on growth and egg production traits of a Thai native chicken breed Lueng Hang Kao Kabinburi (LHKK) housed under intensive management under a tropical climate.


Genetic parameters were estimated for weight measured at four weekly intervals from hatch (BWID) to 24 (BW24) weeks of age, as well as weight at first egg (BWFE), age at first egg (AFE), egg weight at first egg (EWFE) and total number of eggs produced during the first 17 weeks of lay (EN) using restricted maximum likelihood (REML). Inbreeding depression was estimated using a linear regression of individual phenotype on inbreeding coefficient.


Direct additive genetic effect was significant for all traits. Maternal genetic effect and permanent environmental hen effects were significant for all early growth traits, expect for BW24. For BW24, maternal genetic effect was also significant. Permanent environmental hen effect was significant for AFE. Direct heritabilities ranged from 0.10 to 0.47 for growth traits and ranged from 0.15 to 0.16 for egg production traits. Early growth traits had high genetic correlations between them. The EN was lowly negatively correlated with other traits. The average rate of inbreeding for the population was 0.09% per year. Overall, the inbreeding had no effect on body weight traits, except for BW1D. An increase in inbreeding coefficient by 1% reduced BWID by 0.09 g (0.29% of the mean).
Improvement in body weight gain can be achieved by selecting for early growth traits. Selection for higher body weight traits is expected to increase the weight of first egg. Due to low but unfavorable correlations with body weight traits, selection on EN needs to be combined with other traits via multi-trait index selection to improve body weight and EN simultaneously.
Keywords: Indigenous Chicken; Heritability; Genetic Correlation; Inbreeding Depression; Tropical Climate

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