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  Genetic parameters of piglet mortality traits in Danish crossbred pigs
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Ophav

 Ophav:
Strange, Trine1, Forfatter
Mark, Thomas1, Vejleder
Ask, Birgitte1, Vejleder
Nielsen, Bjarne1, Vejleder
Tilknytninger:
1Det Biovidenskabelige Fakultet, København, Danmark, diskurs:18              
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 Abstract: The aim of this study was twofold: 1) to investigate the genetic background of piglet mortality in Danish crossbred piglets by estimating genetic parameters of both different mortality causes (stillborn, weak at birth, starvation, and crushing) and overall mortality, and 2) to investigate the genetic relationship between total number of piglets born and stillborns, as well as mortality of live born piglets by estimating genetic parameters. Data consisted of 31,754 piglets (1,994 litters), which originated from 195 Duroc sires and 879 crossbred Landrace x Yorkshire (LY) or vice versa (YL) dams. The mortality traits (stillborn, weak at birth, starvation, and crushing) and overall mortality were analyzed univariately using ageneralized linear mixed model with a probit link function, including the genetic effect of both sire and dam. Underlying and observed heritabilities (based on sire component) for the mortality traits and overall mortality ranged from 0.026-0.126 and 0.000-0.022, respectively. The underlyingand observed heritabilities (based on dam component) for the mortality traits and overall mortality ranged from 0.080-0.252 and 0.001-0.087, respectively. Furthermore, the underlying and observed heritabilities (based on both sire and dam components) for the mortality traits and overall mortality ranged from 0.079-0.164 and 0.001-0.051, respectively. Genetic correlations betweenthe mortality traits were estimated multivariately using a generalized linear mixed model with a probit link function, including only the genetic effect of sire (data extended with 2,440 piglets from the same sires). Genetic correlation between stillborn and weak at birth was 0.28, whereas genetic correlations close to zero were found between stillborn and starvation as well as crushing.Genetic correlations between weak at birth, starvation and crushing were 0.32-0.49. The results suggest that mortality in crossbred piglets is affected by genetics. Although low, the estimated heritabilities suggest that the investigated mortality traits are heritable. The genetic correlations indicate that the genetics behind the mortality traits are different, and could be treated separatelyin a selection program. Especially, stillborn could be separated from the other causes. The relationships between total number of piglets born and stillborns, as well as mortality of live born piglets were analyzed multivariately using a linear mixed model, which included the genetic effect of sire. Heritabilities ranged between 0.140-0.277. The genetic and phenotypic correlationsbetween the three traits were 0.30-0.84 and 0.30-0.38, respectively. The estimated heritabilities indicate that the traits are affected by sire genetics. Both the genetic and phenotypic correlations between total number of piglets born and the two mortality traits are found to be unfavorable. In addition, the results showed that the sire only explains a small proportion of the total variance,which indicate that the potential for reducing piglet mortality through genetic selection in the sire line seems limited.
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Basal

Bogmærk denne post: https://diskurs.kb.dk/item/diskurs:19316:2
 Type: Speciale
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Detaljer

Sprog: English - eng
 Datoer: 2011
 Sider: 49 pages
 Publiceringsinfo: København, Danmark : Institut for Basal Husdyr- og Veterinærvidenskab
 Indholdsfortegnelse: -
 Note: Agricultural Science, Agronom
 Type: Speciale
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