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Asian-Australas J Anim Sci > Accepted Articles
DOI: https://doi.org/10.5713/ajas.19.0855    [Accepted] Published online February 25, 2020.
Identifying early indicator traits for sow longevity using a linear-threshold model in Thai Large White and Landrace females
Suppasit Plaengkaeo1  , Monchai Duangjinda1,*  , Kenneth J. Stalder2 
1Department of Animal science, Faculty of Agriculture, Khon kaen University, Khon kaen, 40002, Thailand
2Department of Animal Science, 109 Kildee Hall, Iowa State University, Ames, IA 50011-3150, United States
Correspondence:  Monchai Duangjinda, Tel: +66-43-202360, Fax: +66-43-202361, Email: monchai@kku.ac.th
Received: 2 November 2019   • Revised: 18 December 2019   • Accepted: 14 February 2020
Abstract
Objective
The objective of the study was to investigate the possibility of utilizing an early litter size trait as an indirect selection trait for longevity and to estimate genetic parameters between sow stayability and litter size at different parities using a linear-threshold model for longevity in Thai Large White and Landrace populations.
Methods
The data included litter size at first, second, and third parities (NBA1, NBA2, and NBA3) and sow stayability from first to fourth farrowings (STAY14). The data was obtained from 10,794 Landrace (LR) and 9,475 Large White (LW) sows. Genetic parameters were estimated using the multiple-trait animal model. A linear-threshold model was used in which NBA1, NBA2, and NBA3 were continuous traits, while STAY14 was considered a binary trait.
Results
Heritabilities for litter size were low and ranged from 0.01 to 0.06 for both LR and LW breeds. Similarly, heritabilities for stayability were low for both breeds. Genetic associations between litter size and stayability ranged from 0.43 to 0.65 for LR populations and 0.12 to 0.55 for LW populations. The genetic correlation between NBA1 and STAY14 was moderate and in a favorable direction for both LR and LW breeds (0.65 and 0.55, respectively).
Conclusion
A linear-threshold model could be utilized to analyze litter size and sow stayability traits. Furthermore, selection for litter size at first parity, which was the genetic trait correlated with longevity, is possible when one attempts to improve lifetime productivity in Thai swine populations.
Keywords: Genetic Parameter; Threshold Models; Litter Size; Sow Stayability; Swine
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