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Potential response from selection schemes based on progeny testing and genomic selection for the Chilean dairy cattle under pastoral systems: a deterministic simulation

Published online by Cambridge University Press:  30 August 2022

Felipe Lembeye ,
Nicolás López-Villalobos  and
Héctor Uribe
Felipe Lembeye*
Affiliation:
Departamento Agropecuario, Gerencia Agrícola, Soprole S.A., San Bernardo, Chile
Nicolás López-Villalobos
Affiliation:
School of Agriculture and Environment, Massey University, Palmerston North, New Zealand
Héctor Uribe
Affiliation:
Departamento de Producción Animal, Facultad de Ciencias Agronómicas, Universidad de Chile, Santiago, Chile
*
Author for correspondence: Felipe Lembeye, Email: [email protected]
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Abstract

Recently, a selection index called Valor Económico Lechero (VEL) was developed for Chilean dairy cattle under pasture. However, a specific selection scheme has not yet been implemented. This study aimed to estimate genetic progress from selection on the VEL selection index based on selection schemes using progeny testing (PT) and genomic selection (GS). Under a PT-scheme, estimated genetic progress was 41.50, 3.44, and 2.33 kg/year for milk, fat, and protein yield, respectively. The realised genetic gain takes eight-year after the PT-scheme implementation, which may be a disincentive for implementing a PT-scheme, suggesting that importing frozen semen of proven bulls could be a preferred alternative. In this case, an option may be to conduct the genetic evaluation of those bulls using their progeny in Chile for the traits included in VEL selection index. In the case of implementing a specific selection scheme, compared to PT, a more profitable alternative might be the implementation of a GS-scheme, that would result in a faster genetic gain in the aggregate breeding value or merit for all the traits included in the selection objective (0.323–0.371 vs. 0.194 σg/year).

Keywords

Chiledairy cattlegenetic gainselection scheme
Type
Research Article
Information
Journal of Dairy Research , Volume 89 , Issue 3 , August 2022 , pp. 231 - 235
Copyright
Copyright © The Author(s), 2022. Published by Cambridge University Press on behalf of Hannah Dairy Research Foundation

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