With the objective of estimate the genetic parameters for survival (ST) and litter size (LS) at birth, 4530 records of Landrace piglets were used. A two-trait animal model was used using REML. Model included random animal direct and maternal additive genetic for both traits and fixed effects of a herd-year-month of birth-sex contemporary group as well as of dam age. Estimates of direct and maternal heritability were for LS: 0.13, 0.03; for ST: 0.02, 0.02. Corresponding estimates of direct-maternal genetic correlations were 0.68 and 0.63. Estimates of direct additive genetic annual trends were for LS: 0.03 piglets and for ST: 0.03%. Response on selection for LS will be low due to the low estimate of heritability.
Proceedings of the World Congress on Genetics Applied to Livestock Production, Volume , , 06.27, 2006
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