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.: Home > Animal Science Papers and Reports > 2007 > Volume 25 Number 3 > Magdalena Sobczyٌska1, Tadeusz Blicharski1, Agnieszka Korwin-Kossakowska1, Marian Kamyczek2

Maternal effects on farrowing and pre-weaning traits in Line 990 pigs

Magdalena Sobczyٌska1, Tadeusz Blicharski1, Agnieszka Korwin-Kossakowska1, Marian Kamyczek2
1 Polish Academy of Sciences Institute of Genetics and Animal Breeding, Jastrzêbiec, 05-552 Wَlka Kosowska, Poland 2 National Research Institute of Animal Production, 32-083 Balice, Poland
Abstract :

The importance was studied of the inclusion of maternal genetic effects in the animal model on
genetic estimates of the following reproductive parametres of Line 990 pigs: litter size, litter weight,
survival rate, age at first farrowing and farrowing interval. Additive direct genetic variance for age
at first farrowing was three times smaller after fitting the model with maternal effect. The estimates
of ha 2 for the first parity litter size and litter weight appeared slightly higher than those obtained for parities 2-8 and including the maternal genetic effect. Decrease of direct heritability coefficient for age at first farrowing was observed after including maternal effect in the model (0.10 vs 0.03). The highest hm 2 estimates were observed for age at first farrowing (0.21), number of piglets born alive and litter weight at weaning (0.09). The proportions of the sow permanent environmental variance and variance caused by service sire to total variance were small and close to those obtained for two models – with and without maternal effects. Direct-maternal correlations were high and negative for all traits. Likelihood ratio test indicated that maternal genetic effects were significant for age at first farrowing only.

Keywords :
genetic parametres / maternal effects / pigs / reproduction

Date Deposited : 08 Aug 2011 12:35

Last Modified : 08 Aug 2011 12:35

Official URL: http://www.ighz.edu.pl/

Volume 25, Number 3, - 2007

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