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Response to selection for feed conversion ratio in Japanese quail
S Varkoohi1, M Moradi Shahr Babak, A Pakdel
1Department of Animal Science, University College of Agriculture and Natural Resources, University of Tehran, PO Box 4111, Karaj, Iran. s.varkoohi@gmail.com [corrected]
Poultry Science
|July 17, 2010
Summary
Selection for improved feed conversion ratio (FCR) in Japanese quail significantly enhanced growth traits. This genetic improvement resulted in higher body weight and weight gain, alongside reduced feed intake and residual feed intake (RFI).
Area of Science:
- Animal Genetics and Breeding
- Poultry Science
- Quantitative Genetics
Background:
- Feed conversion ratio (FCR) is a critical economic trait in poultry production.
- Understanding the genetic basis of FCR and its correlated responses is essential for efficient breeding programs.
- Japanese quail are a valuable model for studying avian growth and efficiency.
Purpose of the Study:
- To investigate the genetic effects of selecting for improved feed conversion ratio (FCR) in Japanese quail.
- To quantify the realized heritability of FCR and its correlated responses on body weight (BW), weight gain (WG), feed intake (FI), and residual feed intake (RFI).
- To assess the genetic progress achieved over three generations of selection.
Main Methods:
- A selection line (F line) was established by selecting for reduced FCR, while a control line (C line) was maintained via random breeding.
- Three generations of selection were performed using 35 sires and 70 dams per generation.
- Realized heritability was calculated, and genetic responses were quantified by comparing the means of the F and C lines.
Main Results:
- A realized heritability of 0.67 for FCR was observed after three generations.
- The F line showed an 18.4% cumulative genetic improvement in FCR compared to the C line.
- Correlated responses included significant increases in BW (16.4%) and WG (17.2%), and decreases in FI (4.9%) and RFI (-34.7 g).
Conclusions:
- Selection for reduced FCR is highly effective in Japanese quail, yielding substantial genetic gains.
- Selection for FCR positively impacts growth performance, increasing body weight and weight gain.
- This selection strategy effectively reduces feed intake and residual feed intake, indicating improved feed utilization efficiency.
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