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Possibility of modifying the growth trajectory in Raeini Cashmere goat

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Abstract

The objective of this study was to investigate the possibility of modifying the growth trajectory in Raeini Cashmere goat breed. In total, 13,193 records on live body weight collected from 4788 Raeini Cashmere goats were used. According to Akanke’s information criterion (AIC), the sing-trait random regression model included fourth-order Legendre polynomial for direct and maternal genetic effect; maternal and individual permanent environmental effect was the best model for estimating (co)variance components. The matrices of eigenvectors for (co)variances between random regression coefficients of direct additive genetic were used to calculate eigenfunctions, and different eigenvector indices were also constructed. The obtained results showed that the first eigenvalue explained 79.90% of total genetic variance. Therefore, changing the body weights applying the first eigenfunction will be obtained rapidly. Selection based on the first eigenvector will cause favorable positive genetic gains for all body weight considered from birth to 12 months of age. For modifying the growth trajectory in Raeini Cashmere goat, the selection should be based on the second eigenfunction. The second eigenvalue accounted for 14.41% of total genetic variance for body weights that is low in comparison with genetic variance explained by the first eigenvalue. The complex patterns of genetic change in growth trajectory observed under the third and fourth eigenfunction and low amount of genetic variance explained by the third and fourth eigenvalues.

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Acknowledgements

The authors wish to thank all breeding station staff of Raeini Cashmere goat which were involved in data collection and maintaining the flock.

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Authors and Affiliations

  1. Department of Animal Science, Faculty of Agricultural Science, Payame Noor University, Tehran, Iran

    Heydar Ghiasi

  2. Department of Animal Science, Faculty of Agriculture, University of Jiroft, P.O. Box 364, Jiroft, Iran

    M. S. Mokhtari

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  1. Heydar Ghiasi
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  2. M. S. Mokhtari
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Correspondence to Heydar Ghiasi.

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All applicable international, national, and/or institutional guidelines for the care and use of animals were followed.

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The authors declare that they have no conflict of interest.

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Ghiasi, H., Mokhtari, M.S. Possibility of modifying the growth trajectory in Raeini Cashmere goat. Trop Anim Health Prod 50, 1449–1454 (2018). https://doi.org/10.1007/s11250-018-1579-6

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