Uniformity in birth weight is heritable in Norwegian White Sheep

Panya Sae-Lim, Jette H. Jakobsen, H.A. Mulder

Research output: Chapter in Book/Report/Conference proceedingConference paper

Abstract

Birth weight is an optimum trait where very high and very low birth weights are undesirable as they may cause issues, such as dystocia, stillbirths and diminished lamb vigor. Due to economic and welfare concerns, selection for more uniform birth weight is therefore desirable at all litter sizes. If uniformity in birth weight is heritable, selection against very high and very low birth weights can be conducted. The aim of the current study was to investigate if direct and maternal genetic variances in uniformity in birth weight exist in Norwegian White Sheep (NWS). Data composed birth weights of 136,992 NWS lambs born between 2000 and 2017 and corresponding sire-maternal grand sire pedigree. The double hierarchical generalized linear mixed model (DHGLM) was fitted. The direct and maternal heritability for uniformity of birth weight were 0.08 and 0.11, respectively, and larger than for many other uniformity traits in livestock. Furthermore, the direct (57.8%) and maternal (69.4%) genetic coefficients of variation for uniformity were substantial, revealing large potential for selection for more uniform birth weight in NWS lambs. Genetic correlations between direct and maternal genetic effects on birth weight and uniformity were 0.39 and 0.12, respectively, indicating that that selection for more uniform birth weight may reduce the average birth weight genetically.
Original languageEnglish
Title of host publicationProceedings of the 11th World Congress on Genetics Applied to Livestock Production
Subtitle of host publicationVolume Challenges - Genotype by Environment Interactions
PublisherWCGALP
Number of pages6
Publication statusPublished - Feb 2018
Event11th World Congress on Genetics Applied to Livestock Production - Auckland, New Zealand
Duration: 11 Feb 201816 Feb 2018

Conference

Conference11th World Congress on Genetics Applied to Livestock Production
CountryNew Zealand
CityAuckland
Period11/02/1816/02/18

Fingerprint

birth weight
sheep
lambs
low birth weight
sires
dystocia
fetal death
genetic variance
litter size
pedigree
genetic correlation
vigor
heritability
livestock
economics

Keywords

  • Sheep
  • Birth weight
  • Uniformity
  • Maternal genetic effect
  • DHGLM

Cite this

Sae-Lim, P., Jakobsen, J. H., & Mulder, H. A. (2018). Uniformity in birth weight is heritable in Norwegian White Sheep. In Proceedings of the 11th World Congress on Genetics Applied to Livestock Production: Volume Challenges - Genotype by Environment Interactions [278] WCGALP.
Sae-Lim, Panya ; Jakobsen, Jette H. ; Mulder, H.A. / Uniformity in birth weight is heritable in Norwegian White Sheep. Proceedings of the 11th World Congress on Genetics Applied to Livestock Production: Volume Challenges - Genotype by Environment Interactions. WCGALP, 2018.
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Sae-Lim, P, Jakobsen, JH & Mulder, HA 2018, Uniformity in birth weight is heritable in Norwegian White Sheep. in Proceedings of the 11th World Congress on Genetics Applied to Livestock Production: Volume Challenges - Genotype by Environment Interactions., 278, WCGALP, 11th World Congress on Genetics Applied to Livestock Production, Auckland, New Zealand, 11/02/18.

Uniformity in birth weight is heritable in Norwegian White Sheep. / Sae-Lim, Panya; Jakobsen, Jette H.; Mulder, H.A.

Proceedings of the 11th World Congress on Genetics Applied to Livestock Production: Volume Challenges - Genotype by Environment Interactions. WCGALP, 2018. 278.

Research output: Chapter in Book/Report/Conference proceedingConference paper

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N2 - Birth weight is an optimum trait where very high and very low birth weights are undesirable as they may cause issues, such as dystocia, stillbirths and diminished lamb vigor. Due to economic and welfare concerns, selection for more uniform birth weight is therefore desirable at all litter sizes. If uniformity in birth weight is heritable, selection against very high and very low birth weights can be conducted. The aim of the current study was to investigate if direct and maternal genetic variances in uniformity in birth weight exist in Norwegian White Sheep (NWS). Data composed birth weights of 136,992 NWS lambs born between 2000 and 2017 and corresponding sire-maternal grand sire pedigree. The double hierarchical generalized linear mixed model (DHGLM) was fitted. The direct and maternal heritability for uniformity of birth weight were 0.08 and 0.11, respectively, and larger than for many other uniformity traits in livestock. Furthermore, the direct (57.8%) and maternal (69.4%) genetic coefficients of variation for uniformity were substantial, revealing large potential for selection for more uniform birth weight in NWS lambs. Genetic correlations between direct and maternal genetic effects on birth weight and uniformity were 0.39 and 0.12, respectively, indicating that that selection for more uniform birth weight may reduce the average birth weight genetically.

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Sae-Lim P, Jakobsen JH, Mulder HA. Uniformity in birth weight is heritable in Norwegian White Sheep. In Proceedings of the 11th World Congress on Genetics Applied to Livestock Production: Volume Challenges - Genotype by Environment Interactions. WCGALP. 2018. 278