Dakhlan, A. and Moghaddar, N. and Van der Werf, J.H.J. Genotype by Birth Type or Rearing Type Interactions for Growth and Ultrasound ScanningTraits in Merino Sheep. Animal Production Science. ISSN 1836-0939 (In Press)

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Abstract

This study explores the interaction between genetic potential for growth in Merino lambs and their birth type (BT) or rearing type (RT). Data on birth weight (BWT), weaning weight (WWT), post-weaning weight (PWWT), scan fat (PFAT) and eye muscle depth (PEMD) were used from 3,920 single and 4,492 twin born lambs from 285 sires and 5,279 dams. Univariate analysis showed a significant sire x BT interaction accounting for 1.59% and 2.49% of the phenotypic variation for BWT and WWT, respectively, and no significant effect for PWWT, PFAT and PEMD. Sire x RT interaction effects were much smaller and only significant for PEMD. Bivariate analysis indicated that the genetic correlation (rg) between trait expression in lambs born and reared as singles versus those born and reared as twins were high for BWT, WWT, PWWT (0.91 ± 0.02 - 0.96 ± 0.01), while rg for PFAT and PEMD were lower (0.81 ± 0.03 and 0.86 ± 0.02). The rg between traits expressed in lambs born and reared as singles versus those born as twins but reared as singles were lower: 0.77 ± 0.08, 0.88 ± 0.03, 0.66 ± 0.06 and 0.61 ± 0.08 for WWT, PWWT, PFAT and PEMD, respectively. A different RT only affected the expression of breeding values for PFAT and PEMD (rg 0.62 ± 0.04 and 0.47 ± 0.03, respectively). This study showed genotype by environment interaction for BWT and WWT (sire by BT interaction) and for PEMD (sire by RT interaction). However, sires’ breeding value of a model that accounts for sire by BT interaction provides a very similar ranking of sires compared to a model that ignores it, implying that there is no need to correct for the effect in models for genetic evaluation.

Item Type:	Article
Subjects:	S Agriculture > SF Animal culture
Depositing User:	Dr. Akhmad Dakhlan
Date Deposited:	03 Jul 2018 09:51
Last Modified:	03 Jul 2018 09:51
URI:	http://repository.lppm.unila.ac.id/id/eprint/8377

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