Estimation of (co)Variance components of growth curve parameters in Japanese quail

Document Type : Research Paper

Authors

1 Assistant Professor of animal breeding and genetic, Research Center of Special Domestic Animals, University of Zabol, Zabol, Iran

2 M.Sc. Student of Animal Breeding, Department of Animal Science Agriculture Faculty, University of Zabol, Zabol, Iran

3 Assistant Professor of Animal Breeding, Department of Animal Science Agriculture Faculty, University of Zabol, Zabol, Iran

4 Associate Professor of Animal Breeding, Department of Animal Science Agriculture Faculty, University of Zabol, Zabol, Iran

Abstract

The purpose of the present study was to estimation of (co)variance components and genetic parameters of the growth curve in crossbred population. For this purpose, body weight records were fitted through the Gompertz curve and curve parameters were estimated. The final weight (Wf), hatch weight (W0), mature rate index (K), age (ti) and weight (Wi) in inflection point and growth rate in different days for all of the birds were predicted by Gompertz model. The estimated of (co)variance and genetic parameters were performed using a multi-trait animal model through Gibbs sampling. Heritability of the growth cure parameters including final weight, hatch weight, mature index and weight and age in inflection point was 0.335, 0.269, 0.273, 0.291 and 0.397, respectively. Also, the heritability of growth rate traits from hatch to 45 days was estimated high and varied between 0.311 to 0.424. The genetic correlation between hatch weight with mature index and final weight was positive (0.14 and 0.24), but the genetic correlation between hatch weight with age and weight at inflection point was negative (-0.24 and -0.12). The genetic correlation of the mature index with hatch weight, mature weight, age and weight at inflection point was negative. Genetic correlation of the mature index with growth rate in the early ages of bird was positive and it was estimated medium and negative for late. The weight at inflection point had the positive genetic correlation with most of growth rate traits and the change trend from beginning to end of growth period was ascending.

Keywords

References

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Iranian Journal of animal Science
Volume 49, Issue 2 - Serial Number 2
September 2018
Pages 237-246

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History

  • Receive Date: 21 January 2018
  • Revise Date: 19 July 2018
  • Accept Date: 18 August 2018

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