Genetic parameters for early piglet weight, litter traits and number of functional teats in organic pigs

Zaalberg, R.M.; Chu, Thinh Tuan; Bovbjerg, H.; Jensen, Just; Villumsen, Trine Michelle

doi:10.1016/j.animal.2023.100717

Cited by 3 publications

(1 citation statement)

References 22 publications

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“…For maternal ability traits in pigs, accounting for the effect of litter size might affect the results of genetic parameter estimation (e.g., Banville et al, 2014;Kapell et al, 2011;Nguyen et al, 2021). Recently, Zaalberg et al (2023) discussed the necessity to account for litter size when analysing piglet weight traits in outdoor-reared pigs. Current Japanese national swine genetic evaluation for litter performance traits fits the three-trait repeatability animal model for NBA, LSW, and TWW as an operational model (http://www.nlbc.go.jp/ kachi kukai ryo/iden/buta/hyoka_breed.pdf), and the models for LSW and TWW include the effect of litter size at start of suckling (LSS) as a linear covariate.…”

Section: Introductionmentioning

confidence: 99%

Genetic parameter estimation for pork production and litter performance traits of Landrace, Large White, and Duroc pigs in Japan

Ogawa

Takahashi²,

Satoh

2023

J Animal Breeding Genetics

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We estimated genetic parameters for two pork production and six litter performance traits of Landrace, Large White, and Duroc pigs reared in Japan. Pork production traits were average daily gain from birth to end of performance testing and backfat thickness at end of testing (46,042 records for Landrace, 40,467 records for Large White, and 42,920 records for Duroc). Litter performance traits were number born alive, litter size at weaning (LSW), number of piglets dead during suckling (ND), survival rate of piglets during suckling (SV), total piglet weight at weaning (TWW), and average piglet weight at weaning (AWW) (27,410, 26,716, and 12,430 records for Landrace, Large White, and Duroc, respectively). ND was calculated as the difference between LSW and litter size at start of suckling (LSS). SV was calculated as LSW/LSS. AWW was calculated as TWW/LSW. Pedigree data for Landrace, Large White, and Duroc breeds contained 50,193, 44,077, and 45,336 pigs, respectively. Trait heritability was estimated via single‐trait analysis and genetic correlation between two traits was estimated via two‐trait analysis. When considering the linear covariate of LSS in the statistical model for LSW and TWW, for all breeds, the heritability was estimated to be 0.4–0.5 for pork production traits and below 0.2 for litter performance traits. Estimated genetic correlation between average daily gain and backfat thickness was small, ranging from 0.057 to 0.112, and those between pork production traits and litter performance traits were negligible to moderate, ranging from −0.493 to 0.487. A wide range of genetic correlation values among the litter performance traits was estimated, while that between LSW and ND could not be obtained. The results of genetic parameter estimation were affected by whether the linear covariate of LSS was included in the statistical model for LSW and TWW or not. This finding implies the necessity of carefully interpreting the results according to the choice of statistical model. Our results could give fundamental information on simultaneously improving productivity and female reproductivity for pigs.

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Section: Introductionmentioning

confidence: 99%

Genetic parameter estimation for pork production and litter performance traits of Landrace, Large White, and Duroc pigs in Japan

Ogawa

Takahashi²,

Satoh

2023

J Animal Breeding Genetics

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The effects of phenotyping and genotyping strategies, and the use of conventional or organic sires on genetic gain in an organic pig population

Zaalberg,

Clasen,

Bovbjerg

et al. 2024

Livestock Science

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Turopolje Pig: Between Conservation and Sustainability

Škorput,

Kaić,

Špehar

et al. 2024

Sustainability

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The Turopolje pig is a fatty-type pig breed created during the Middle Ages in the Turopolje region in Central Croatia. Although the population of the Turopolje pig is stable today, this breed is still one of the endangered breeds that are severely threatened by inbreeding. The aim of this work was to evaluate the genetic diversity parameters of the recent Turopolje pig population in Croatia and to consider mating strategies to limit the increase in inbreeding in the population using algorithms within an optimal contribution selection frame. The pedigree of 1155 individuals was analysed. In addition to the basic pedigree structure, the following population parameters were analysed: average coefficient of inbreeding; mean rate of increase in coancestry; increase in coancestry between any individuals; effective population size. Based on obtained parameters, mating optimization using estimated kinship between candidates in several scenarios was carried out, restricting maximal kinship between candidates on a minimal possible value 0.07, as the least possible level of kinship, candidates on a value of 0.10, and candidates on a value of 0.25. The average inbreeding coefficient (F) in the population was 0.03, while the average F of inbred animals was 0.10. The effective population size obtained from pedigrees based on the increase in coancestry (0.17) was 29.14. Mating plans were created from 5 active boars and 120 sows in different scenarios with constraint on the level of kinship between candidates. The least possible level of kinship was 0.07, and no available solutions were under this level. With the increase in the allowed kinship between candidates, the level of inbreeding increased from 0.01 to 0.06 in the next generation. Under practical conditions, mating between ideal individuals in local pig populations is not always possible, and the use of optimisation algorithms allows alternative mating within existing populations to be considered. Finally, this approach opens up the possibility of potentially improving sustainable breeding through selection by considering breeding values for economically important traits. This approach can help to differentiate the Turopolje pig breed from other commercial and local breeds, e.g., for meat quality traits.

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Genetic parameters for early piglet weight, litter traits and number of functional teats in organic pigs

Cited by 3 publications

References 22 publications

Genetic parameter estimation for pork production and litter performance traits of Landrace, Large White, and Duroc pigs in Japan

Genetic parameter estimation for pork production and litter performance traits of Landrace, Large White, and Duroc pigs in Japan

The effects of phenotyping and genotyping strategies, and the use of conventional or organic sires on genetic gain in an organic pig population

Turopolje Pig: Between Conservation and Sustainability

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