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Phenotypic Responses to Selection for Ultrafine Wool in Uruguayan Yearling Lambs

Author

Listed:
  • Zully Ramos

    (School of Agriculture and Environment, Massey University, Private Bag 11222, Palmerston North 4410, New Zealand)

  • Hugh Thomas Blair

    (School of Agriculture and Environment, Massey University, Private Bag 11222, Palmerston North 4410, New Zealand)

  • Ignacio De Barbieri

    (Estación Experimental INIA Tacuarembó, Instituto Nacional de Investigación Agropecuaria, Ruta 5 km 386, Tacuarembó 45000, Uruguay)

  • Gabriel Ciappesoni

    (Estación Experimental INIA Tacuarembó, Instituto Nacional de Investigación Agropecuaria, Ruta 5 km 386, Tacuarembó 45000, Uruguay)

  • Fabio Montossi

    (Estación Experimental INIA Tacuarembó, Instituto Nacional de Investigación Agropecuaria, Ruta 5 km 386, Tacuarembó 45000, Uruguay)

  • Paul Richard Kenyon

    (School of Agriculture and Environment, Massey University, Private Bag 11222, Palmerston North 4410, New Zealand)

Abstract

This study evaluated the phenotypic trends for wool and growth traits of the fine Merino genetic nucleus in Uruguay. Data were collected from one-year-old lambs over a twenty-year period (1999–2018). The overall aim of the selection flock was to reduce fiber diameter with concomitant increases in fleece and live weights. Traits analyzed included fiber diameter (FD), greasy fleece weight (GFW), coefficient of variation of FD (CVfd), staple length (SL), scoured yield (SY), live weight post-shearing (LW), eye muscle area (EMA) and fat thickness (FAT). Data from approximately 5300 one-year-old male and female lambs were analyzed. During the study period, FD decreased by approximately 3 µm, whereas GFW and LW increased by at least 0.5 and 3.0 kg, respectively. There were interactions between the sex of the individual and the year for all wool traits. Except for FAT, all other traits were affected by the dam age. This study indicates that the selection program applied in the fine Merino genetic nucleus over a twenty-year period resulted in reductions in FD and increases in GFW and LW. Therefore, the results indicate it is possible to produce ultrafine wool in semi-extensive grazing systems without compromising other economically relevant traits in one-year-old lambs.

Suggested Citation

  • Zully Ramos & Hugh Thomas Blair & Ignacio De Barbieri & Gabriel Ciappesoni & Fabio Montossi & Paul Richard Kenyon, 2021. "Phenotypic Responses to Selection for Ultrafine Wool in Uruguayan Yearling Lambs," Agriculture, MDPI, vol. 11(2), pages 1-16, February.
    • Handle: RePEc:gam:jagris:v:11:y:2021:i:2:p:179-:d:503808
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    References listed on IDEAS

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    1. Champion, S.C. & Fearne, Andrew, 2001. "Alternative Marketing Systems For The Apparel Wool Textile Supply Chain: Filling The Communication Vacuum," International Food and Agribusiness Management Review, International Food and Agribusiness Management Association, vol. 4(3), pages 1-20.
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    Cited by:

    1. Zully Ramos & Hugh Thomas Blair & Ignacio De Barbieri & Gabriel Ciappesoni & Fabio Montossi & Paul Richard Kenyon, 2021. "Productivity and Reproductive Performance of Mixed-Age Ewes across 20 Years of Selection for Ultrafine Wool in Uruguay," Agriculture, MDPI, vol. 11(8), pages 1-18, July.

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